Veterinary antibiotics can enter the environment due to the common practice of land application of manure from treated animals.The environmental fate of tetracyclines in swine manure after composting and field applica...Veterinary antibiotics can enter the environment due to the common practice of land application of manure from treated animals.The environmental fate of tetracyclines in swine manure after composting and field application remains largely unknown.This study analyzed the concentrations of tetracyclines in manure,manure-based compost and compost amended soil in selected swine farms from Beijing,Jiaxing and Putian,China to determine the dilution effects of antibiotics when released into the soil environment.The results demonstrate that residues of antibiotics were detected in all samples and chlortetracycline as well as its degradation products should be regarded critically concerning their potential ecotoxicity.Application of manure-based compost to soil could reduce the possible risk posed by antibiotic contamination,but the trigger value of 100 μg/kg was still exceeded in soil samples （776.1 μg/kg dw） from Putian City after application of compost.Field studies such as the present one can help to improve the routine administration of antibiotic-containing composted manure.展开更多
An efficient method is provided to detect simultaneously some important veterinary drugs from different classes in highly complex animal tissue matrix. This method using matrix solid-phase dispersion (MSPD) and high p...An efficient method is provided to detect simultaneously some important veterinary drugs from different classes in highly complex animal tissue matrix. This method using matrix solid-phase dispersion (MSPD) and high performance liquid chromatography (HPLC) with diode array detection (DAD) is developed to effectively determine two fiuoroquinolones (enoxacin and lomefioxacin), two sulfonamides (sulfanilamide and sulfamethoxazole) and one tetracycline (tetracycline) simultaneously in porcine tissues. In the process, MSPD methodology was used to treat samples, washed by n-hexane to remove lipid, eluted the analytes with acetonitrile–dichloromethane (1:1, v/v). Solvent acetonitrile and solvent acetic acid (0.1%) were combined in a gradient. HPLC–DAD analysis of the tissue samples was performed within 15 min at a fiow rate of 1.0 mL/min. The results showed that a recovery at 0.1, 0.5 and 1.0 mg/g fortification levels ranged from 80.6% to 99.2% with satisfactory relative standard deviations (RSDs) (below 6.1%, nfi3) and the limits of quantitation (LOQ) ranged from 7 mg/kg to 34 mg/kg in porcine tissues. Utilization of the method in successfully simultaneous analysis of porcine tissue incurred with veterinary drug multiresidues is described.展开更多
A rapid, sensitive and specific ultra-high-performance liquid chromatography tandem mass spectrometry （UPLC-MS） method was developed for the analysis of tetracycline antibiotics, including tetracycline （TC）, oxyte...A rapid, sensitive and specific ultra-high-performance liquid chromatography tandem mass spectrometry （UPLC-MS） method was developed for the analysis of tetracycline antibiotics, including tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and their 4-epimers （4-epiTCs） in agricultural soil fertilized with swine manure. Soil samples were extracted and cleaned-up with 10 mL EDTA-McIlvaine buffer solution （pH 4.0）, then cleaned-up and pre-concentrated using the Oasis MAX cartridge and then eluted with 1 mL solution by mixing formic acid, methanol and water at a ratio of 2：15：83 （v/v/v）. The purified samples were separated by an ACQUITY UPLC BEH C18 column using acetonitrile and water containing 0.1% formic acid mobile phase and detected by a single quadrupole MS. The limits of detection for the soil extraction method （LODsoil） ranged from 0.6-2.5 lag kg-~ with recoveries from 23.3-159.2%. Finally, the method was applied to an agricultural field in an area with intensive pig-fattening farming. Tetracyclines were detected in soil from 2.8 to 42.4 μg kg-1 soil. These results demonstrate that soil from swine farms can become severely contaminated with tetracycline antibiotics and their metabolites.展开更多
This study surveyed 180 samples of ultra high temperature （UHT） milk of four top Chinese dairy brands collected in the 25 cities in China in June 2011, and assessed their contamination with antibiotics, using the EL...This study surveyed 180 samples of ultra high temperature （UHT） milk of four top Chinese dairy brands collected in the 25 cities in China in June 2011, and assessed their contamination with antibiotics, using the ELISA method. The percentages of tetracyclines, sulfonamides, sulfamethazine, and quinolones detected in the samples were 0, 16.7, 40.6, and 100%, respectively. The maximum concentrations of the tetracyclines, sulfonamides, sulfamethazine and quinolones in UHT milk samples were 〈1.5, 26.2, 22.6, and 58.8 μg kg-1, respectively. None of the samples exceeded the maximum residue levels （MRLs） for these four veterinary drugs, according to the regulations set by China, the European Union （EU） and the Codex Alimentarius Commission （CAC）.展开更多
Aiming at the market demand for rapid detection of tetracyclines,fluoroquinolones and sulfonamides in milk,a golloidal gold immunochromatography test strip for simultaneous detection of tetracyclines,fluoroquinolones ...Aiming at the market demand for rapid detection of tetracyclines,fluoroquinolones and sulfonamides in milk,a golloidal gold immunochromatography test strip for simultaneous detection of tetracyclines,fluoroquinolones and sulfonamides in milk was prepared based on the principle of competitive inhibition immunochromatography. The performance indicators of the test strip were verified. The results showed that the test strip can simultaneously detect 4 tetracyclines,13 fluoroquinolones and 13 sulfonamides,and the detection limits all can meet the national residue limits; the tests strip exhibited false positive rate≤5% and false negative rate = 0; and no cross-reaction with other drugs was commonly found in milk,indicating good specificity. The method is simple,rapid,and has low cost and easy popularization. It provides a means for realizing on-site rapid detection and is of important practical significance to guarantee of safety of milk and dairy products in China.展开更多
This paper reported an indirect flow injection chemiluminescence （FI-CL） method for the determination of the drugs tetracycline （TC）, chlortetracycline （CTC） and oxytetracycline（OTC） using Cu（ Ⅱ ） as a prob...This paper reported an indirect flow injection chemiluminescence （FI-CL） method for the determination of the drugs tetracycline （TC）, chlortetracycline （CTC） and oxytetracycline（OTC） using Cu（ Ⅱ ） as a probe ion. The CL reaction was induced on-line and after injection of the sample the negative peaks appeared as a result of complexation. The method was applied to the determination of TCs in pharmaceuticals and human urine with recoveries in the range95-105%.展开更多
Tetracyclines（TCs） discharged from livestock wastewater have aroused public concerns due to their pharmacological threats to ecosystems and human health. As an important medium in the wastewater, suspended organic m...Tetracyclines（TCs） discharged from livestock wastewater have aroused public concerns due to their pharmacological threats to ecosystems and human health. As an important medium in the wastewater, suspended organic matters（SOMs） play vital roles in antibiotics transport and degradation. However, limited information has been reported in the relevant literature. This study investigated TCs sorption behavior on SOM, withdrawn from swine wastewater. High TCs sorption capacities were detected, with the maximum values ranging from 0.337 to 0.679 mg/g. Increasing p H and temperature led to the decline of sorption capacity. Results from three-dimensional excitation–emission matrix fluorescence spectroscopy and Fourier transform infrared spectrometry revealed that amide and carboxyl groups were the main functional groups for TCs adsorption. The interactions between SOM and TCs were clarified as predominated by hydrogen-bonding and cation-exchange in acid conditions, and electrostatic repulsion in neutral or alkaline conditions. Adsorption kinetics modeling was conducted, and a satisfactory fitting was achieved with the Freundlich equation. These results indicated that the adsorption process was a rather complex process, involving a combination of cation-exchange and hydrogen-bonding. The results will provide a better understanding of the capability of SOM for TCs transport and abatement in the wastewater treatment process.展开更多
The presence of tetracyclines in soil and surface water is an emerging concern. The present study was undertaken to investigate remediation of tetracylines (tetracycline (TC), oxytetracycline (OTC) and chlortetracycli...The presence of tetracyclines in soil and surface water is an emerging concern. The present study was undertaken to investigate remediation of tetracylines (tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC)) from aqueous solution using vetiver grass, water lettuce, and sunflower and root exudates of water lettuce, sunflower and from soil by tomato, Indian mustard and carrot plant. The data of this study denote that vetiver grass, water lettuce, sunflower remedy tetracyclines from water. The remediation % after 63 days of treatment was 87-61 for TC;88-68 for OTC and 87-68 for CTC. The remediation of tetracyclines at lower concentration of antibiotics in presence of root exudates of water lettuce and sunflower was more than 99% and remediation was faster than water lettuce or sunflower. The remediation of tetracyclines from aqueous solution may be due to oxidation of-OH group(s) of tetracycline through a process that is thought to involve reactive oxygen intermediates and/or role of peroxidase enzyme. The plant crops viz., tomato, Indian mustard and carrot can remedy 41%-72% of amended tetracyclines. The maximum bioaccumulation of TC and CTC was in Indian mustard and OTC was maximally bioaccumulated in tomato.展开更多
Antibiotic contamination of the water environment has attracted much attention from researchers because of their potential hazards to humans and ecosystems.In this study,a multi-template molecularly imprinted polymer(...Antibiotic contamination of the water environment has attracted much attention from researchers because of their potential hazards to humans and ecosystems.In this study,a multi-template molecularly imprinted polymer(MIP)modified mesoporous silica coated magnetic graphene oxide(MGO@MS@MIP)was prepared by the surface imprinting method via a sol-gel process and was used for the selective,efficient and simultaneous removal of tetracyclines(TCs),including doxycycline(DC),tetracycline(TC),chlorotetracycline(CTC)and oxytetracycline(OTC)from water.The synthesized MIP composite was characterized by Fourier transform infrared spectroscopy,transmission electron microscope and thermogravimetric analysis.The adsorption properties of MGO@MS@MIP for these TCs were characterized through adsorption kinetics,isotherms and selectivity tests.The MIP composite revealed larger adsorption quantities,excellent selectivity and rapid kinetics for these four tetracyclines.The adsorption process was spontaneous and endothermic and followed the Freundlich isotherm model and the pseudo-second-order kinetic model.The MGO@MS@MIP could specifically recognize DC,TC,CTC and OTC in the presence of some chemical analogs.In addition,the sorption capacity of the MIP composite did not decrease significantly after repeated application for at least five cycles.Thus,the prepared magnetic MIP composite has great potential to contribute to the effective separation and removal of tetracyclines from water.展开更多
AgVO_(3)/ZIF-8 composites with enhanced photocatalytic effect were prepared by the combination of AgVO_(3)and ZIF-8.X-ray diffraction(XRD),scanning electron microscopy(SEM),high-power transmission electron microscopy(...AgVO_(3)/ZIF-8 composites with enhanced photocatalytic effect were prepared by the combination of AgVO_(3)and ZIF-8.X-ray diffraction(XRD),scanning electron microscopy(SEM),high-power transmission electron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),photoluminescence(PL)spectroscopy,electron spin resonance(ESR)spectroscopy,transient photocurrent and electrochemical impedance spectroscopy(EIS)were used to characterize binary composites.Tetracycline(TC)was used as a substrate to study the performance efficiency of the degradation of photocatalysts under light conditions,and the degradation effect of TC was also evaluated under different mass concentrations and ionic contents.In addition,we further investigated the photocatalytic mechanism of the binary composite material AgVO_(3)/ZIF-8 and identified the key active components responsible for the catalytic degradation of this new photocatalyst.The experimental results show that the degradation efficiency of 10%-AZ,prepared with a molar ratio of 10%AgVO_(3)and ZIF-8 to TC,was 75.0%.This indicates that the photocatalytic activity can be maintained even under a certain ionic content,making it a suitable photocatalyst for optimal use.In addition,the photocatalytic mechanism of binary composites was further studied by the active species trapping experiment.展开更多
A determination method has been optimized and validated for the simultaneous analysis of tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and doxycycline （DC） in honey. Tetracyclines （TCs） w...A determination method has been optimized and validated for the simultaneous analysis of tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and doxycycline （DC） in honey. Tetracyclines （TCs） were removed from honey samples by chelation with metal ions bound to small Chelating Sepharose Fast Flow columns and eluted with Na2EDTA-Mcllvaine pH 4.0 buffers. Extracts were further cleaned up by Oasis HLB solid-phase extraction （SPE）, while other solid-phase extraction cartridges were compared. Chromatographic separation was achieved using a polar end-capped C 18 column with an isocratic mobile phase consisting of oxalic acid, acetonitrile and methanol. LC with ultraviolet absorbance at 355 nm resulted in the quantitation of all four tetracycline residues from honey samples fortified at 15, 50, and 100 ng/g, with liner ranges for tetracyclines of 0.05 to 2 μg/mL. Mean recoveries for tetracyclines were greater than 50% with R.S.D. values less than 10% （n= 18）. Detection limits of 5, 5, 10, 10 ng/g for oxytetracycline, tetracycline, chlortetracycline and doxycycline, respectively and quantitation limits of 15 ng/g for all the four tetracyclines were determined. Direct confirmation of the four residues in honey （2-50 ng/g） was realized by liquid chromatography-tandem mass spectrometry （LC/MS/MS）. The linear ranges of tetracyclines determined by LC/MS/MS were between 5 to 300 ng/mL, with the linear correlation coefficient r〉 0.995. The limits of detection of 1 to 2 ng/g were obtained for the analysis of the TCs in honey.展开更多
For environmental applications,it is crucial to rationally design and synthesize photocatalysts with positive exciton splitting and interfacial charge transfer.Here,a novel Agbridged dual Z-scheme Ag/g-C_(3)N_(4)/CoNi...For environmental applications,it is crucial to rationally design and synthesize photocatalysts with positive exciton splitting and interfacial charge transfer.Here,a novel Agbridged dual Z-scheme Ag/g-C_(3)N_(4)/CoNi-LDH plasmonic heterojunction was successfully synthesized using a simple method,with the goal of overcoming the common drawbacks of traditional photocatalysts such as weak photoresponsivity,rapid combination of photogenerated carriers,and unstable structure.These materials were characterized by XRD,FT-IR,SEM,TEM UV-Vis/DRS,and XPS to verify the structure and stability of the heterostructure.The pristine LDH,g-C_(3)N_(4),and Ag/g-C_(3)N_(4)/CoNi-LDH composite were investigated as photocatalysts for water remediation,an environmentally motivated process.Specifically,the photocatalytic degradation of tetracycline was studied as a model reaction.The performance of the supports and composite catalyst were determined by evaluating both the degradation and adsorption phenomenon.The influence of several experimental parameters such as catalyst loading,pH,and tetracycline concentrationwere evaluated.The current study provides important data for water treatment and similar environmental protection applications.展开更多
Metal-organic frameworks(MOFs)and their derivatives have gained significant attention in recent years for their ability to catalyze the advanced oxidation of persulfates.Cerium-doped MOFs,in particular,have shown prom...Metal-organic frameworks(MOFs)and their derivatives have gained significant attention in recent years for their ability to catalyze the advanced oxidation of persulfates.Cerium-doped MOFs,in particular,have shown promise due to their high catalytic efficiency,practical applicability,and cost-effectiveness.However,their structure,catalytic properties,and mechanisms are not yet fully understood.ZIF-8 was chosen as the raw material to prepare cerium-doped hollow carbon nano fibers(Ce-HCNFs)using the electrostatic spinning-calcination method.The objective is to investigate the structure,catalytic performance,and catalytic mechanism of Ce-HCNFs.The results show that Ce-HCNFs catalyzed the degradation of tetracycline(TC)by persulfate up to 76.9%,Quenching experiments and electron paramagnetic resonance experiments indicate the dominant role of single-linear oxygen.Furthermore,the experiments on the influence factor and cycling demonstrate the exceptional stability and recycling capability of Ce-HCNFs in real-world water environments.展开更多
Tetracycline(TC)is a broad-spectrum antibiotic,and its residues in the environment and food are harmful to human health.Therefore,it is essential to rapidly,sensitively,and conveniently detect TC.In this work,we devel...Tetracycline(TC)is a broad-spectrum antibiotic,and its residues in the environment and food are harmful to human health.Therefore,it is essential to rapidly,sensitively,and conveniently detect TC.In this work,we developed a portable silicon nanoparticles chelated Europium(Ⅲ)-based polyacrylonitrile(Eu-SiNPs/PAN)nanofiber membrane for rapid,sensitive,and convenient detection of TC.The Eu-SiNPs were synthesized with a facile one-pot method.The Eu-SiNPs/PAN nanofiber membrane was fabricated by electrospinning,combining Eu-SiNPs and PAN with three-dimensional porous membrane structures and UV resistance.Both the Eu-SiNPs and the Eu-SiNPs/PAN nanofiber membranes have good selectivity and anti-interference ability towards TC.The combined merits of rapid response,long storage life,easy portability,and naked-eye recognition of TC make the Eu-SiNPs/PAN nanofiber membrane a promising material for convenient TC detection applications.The practicability of these nanofiber membranes was further verified by detecting TC in real samples,such as lake water,drinking water and honey,and achieved quantitative detection.展开更多
A series of CeO_(2)@MnO_(2)composites was prepared by deposition-precipitation methods.These materials were used to activate sodium persulfate(PDS)for the oxidation of tetracycline.It is found that the composites,espe...A series of CeO_(2)@MnO_(2)composites was prepared by deposition-precipitation methods.These materials were used to activate sodium persulfate(PDS)for the oxidation of tetracycline.It is found that the composites,especially the CeO_(2)@MnO_(2)-1:4 composites,exhibit better tetracycline removal rates than the pure components.X-ray diffraction(XRD),Raman and scanning electron microscopy(SEM)analyses all indicate that the composite has been successfully prepared with high purity and high crystalline.The XPS analysis shows that the strong interaction between the components promotes the electron transfer.Additionally,the kinetic rate constants of CeO_(2)@MnO_(2)-1:4 after 60 min are 3.8 and 12.7 times higher than pure CeO_(2)and MnO_(2),respectively.CeO_(2)@MnO_(2-)1:4 composite also exhibits excellent catalytic activity for individual and hybrid pollutants.The effects of wastewater matrix,pH,circulation and ion stre ngth on the degradation of tetracycline were investigated.It is found that CeO_(2)@MnO_(2)-1:4 composite has good practical application prospects.CeO_(2)@MnO_(2)composites with synergistic adsorption catalysis can activate PDS and peroxymo no sulfate(PMS)for efficient organic catalytic oxidation.This paper provides the theoretical basis and data support for the practical application of the CeO_(2)@MnO_(2)composite materials.展开更多
Herein,a luminescent europium-based metal-organic framework(Eu-MOF,[Eu_(3)(L)(HL)(NO_(3))_(2)(DMF)_(2)]·4DMF·5H_(2)O,H_(4)L=5,5′-(pyrazine-2,6-diyl)diisophthalic acid,DMF=N,N-dimethylformamide)was developed...Herein,a luminescent europium-based metal-organic framework(Eu-MOF,[Eu_(3)(L)(HL)(NO_(3))_(2)(DMF)_(2)]·4DMF·5H_(2)O,H_(4)L=5,5′-(pyrazine-2,6-diyl)diisophthalic acid,DMF=N,N-dimethylformamide)was developed for the dual-functional detection of environmental pollutants.This fluorescence-quenching-based sensor exhibited excep-tional sensitivity for both 2,4,6-trinitrophenol(TNP)and tetracycline(TC),achieving remarkably low detection lim-its of 1.96×10^(-6)and 1.71×10^(-7)mol·L^(-1),respectively.Notably,the system exhibited 99%fluorescence quenching ef-ficiency for TC,indicating ultra-efficient analyte recognition.The detection performance surpasses most reported lu-minescent MOF sensors,attributed to synergistic mechanisms of fluorescence resonance energy transfer(FRET)and photoinduced electron transfer(PET).CCDC:2446483.展开更多
BACKGROUND Antibiotic resistance significantly impacts the treatment failure rates of Helicobacter pylori(H.pylori)infections.AIM To investigate the trends in primary antibiotic resistance of H.pylori in Taiwan of Chi...BACKGROUND Antibiotic resistance significantly impacts the treatment failure rates of Helicobacter pylori(H.pylori)infections.AIM To investigate the trends in primary antibiotic resistance of H.pylori in Taiwan of China over the past six years.METHODS We conducted a retrospective analysis of H.pylori isolates from Taiwan residents,China who had not undergone previous treatments(n=1408),collected between January 1,2019 and December 31,2024.Susceptibility of these strains to amoxicillin,clarithromycin,levofloxacin,metronidazole,and tetracycline was tested using the Epsilometer test.We analyzed the trends in single and dual resistance profiles over the study period,and compared antibiotic resistance across different regions(northern,southern and eastern areas)of Taiwan of China.RESULTS The overall resistance rates for H.pylori to amoxicillin,clarithromycin,metronidazole,tetracycline,and levofloxacin in Taiwan of China were 1.3%,18.0%,31.0%,0.8%,and 28.7%,respectively.Tetracycline resistance increased significantly from 0%in 2019 to 3.5%in 2024(P value inχ^(2)test for linear trend:<0.001),while metronidazole resistance declined from 35.5%to 13.0%(P value inχ^(2)test for linear trend:<0.001).No significant changes of amoxicillin,clarithromycin and levofloxacin resistances were observed.The dual resistances to clarithromycin plus tetracycline,and metronidazole plus tetracycline both increased significantly from 0%to 1.7%from 2019 to 2024(P value inχ^(2)test for linear trend:<0.05).Furthermore,no significant regional differences in resistance frequencies except for levofloxacin were detected.CONCLUSION Primary antibiotic resistance to tetracycline in H.pylori has increased in Taiwan of China from 2019 to 2024,while resistance to metronidazole has decreased during the same period.The dual resistance to clarithromycin plus tetracycline and metronidazole plus tetracycline both increased significantly.展开更多
Metal halide perovskite nanocrystals(MHP NCs)are of great candidates in photocatalytic applications due to their extreme light utilization efficiency.However,the instability towards humid environment severely restrict...Metal halide perovskite nanocrystals(MHP NCs)are of great candidates in photocatalytic applications due to their extreme light utilization efficiency.However,the instability towards humid environment severely restrict their practical application.Herein,the CsPbBr_(3)/CsPb_(2)Br_(5)heteronanocrystals(HNCs)were successfully encapsulated into ZIF-8 through a thermal injection method via controlling the molar ratio of Cs^(+)/Pb2^(+).The surface of ZIF-8 was then modified with hydrophobic copolymer of poly(methyl methacrylate)(PMMA)to improve the water stability.Benefiting from the intimate interfacial interaction and staggered energy band structure,the type-II heterojunction of CsPb Br_(3)/CsPb_(2)Br_(5)guarantees efficient separation and migration of photogenerated electron/hole pairs.Meanwhile,the formation of Z-scheme heterojunction between ZIF-8 and CsPbBr_(3)/CsPb_(2)Br_(5)HNCs contributes to the adsorption and enrichment of pollutants,further accelerates the photocatalytic antibiotic degradation efficiency towards tetracycline hydrochloride(TCH)in aqueous solution.Nearly 87%of TCH(40 mg/L,50 mL)was degraded by 40 mg catalyst within 100 min.This work offers a feasible approach in assembling high-performance MHP NCsbased efficient photocatalyst with expanding application in aqueous solution.展开更多
Tetracycline hydrochloride(TCH)exists in various forms in aqueous solution due to pH changes,which not only alters the reactivity of TCH,but also affects the process of reactive oxygen species(ROS)attacking the molecu...Tetracycline hydrochloride(TCH)exists in various forms in aqueous solution due to pH changes,which not only alters the reactivity of TCH,but also affects the process of reactive oxygen species(ROS)attacking the molecule.Therefore,the rational design of piezo-photocatalytic materials coupled with a comprehensive understanding of the degradation mechanisms of various TCH species constitutes a critical approach to addressing tetracycline antibiotic contamination.In the design and preparation of piezo-photocatalysts,controlling the oxygen vacancy concentration is crucial as it governs the coupling efficiency between piezoelectric response and photocatalytic activity,as well as the strength of spontaneous polarization.Meanwhile,the morphology of the material is a key factor influencing the migration pathways of charge carriers.In this work,hollow spherical Bi_(4)Ti_(3)O_(12) was synthesized using an inorganic titanium source,demonstrating exceptional piezo-photocatalytic activity.The degradation rate was 1.57 and 5.29 times higher than that of traditional spherical and plate-like morphologies,with a rate constant of k=0.127.In an innovative approach,density functional theory calculations of local softness and hyper-softness were employed to analyze the reactivity changes of TCH in its different deprotonated states toward reactive oxygen species.Combined with molecular electronegativity analysis,the factors influencing the degradation efficiency were identified.This study provides a solid foundation for developing efficient and environmentally friendly piezo-photocatalysts and offers new insights into the degradation mechanism of TCH.展开更多
The emission of organic pollutants from the dye industry and medical treatment represents a significant threat to the quality of water resources and human health.The development of green,environmentally friendly and e...The emission of organic pollutants from the dye industry and medical treatment represents a significant threat to the quality of water resources and human health.The development of green,environmentally friendly and efficient photocatalysts for the removal of organic pollutants from the environment is of paramount importance in addressing these issues.Flower-like lignin-derived carbon(LC)/zinc oxide(ZnO)composites with controllable morphology were synthesized via a direct precipitation method.In this study,alkali lignin was employed as an anionic active agent to alter the molecular arrangement on the liquid surface during the synthesis reaction and to reduce the surface tension between mixtures,thereby forming a special stacked morphology,which was then used for the highly efficient removal of methylidene blue(MB)and tetracycline hydrochloride(TCH)in water under different light conditions.The formation mechanism of LC/ZnO and the degradation characteristics under different reaction conditions were investigated.The loading of LC can form composites with large specific surface area and rich porous structure.In addition,with the help of lignin,the morphology of ZnO was changed from a rod-like structure to a lamellar structure,and LC could effectively reduce the band gap of ZnO,which could improve the electron transfer rate in the photocatalytic process.The·O_(2)^(-)and·OH radicals generated under photoexcitation promoted the decomposition of pollutants.This study presents a simple,economical,and scalable method for the application of photocatalysts and explores new ways for the high-value application of industrial lignin.展开更多
基金supported by the Major Projects of Knowledge Innovation Program of the Chinese Academy of Sciences (No. KZCX2-YW-Q02-05)the Beijing Science and Technology Program (No. D101105046410004)
文摘Veterinary antibiotics can enter the environment due to the common practice of land application of manure from treated animals.The environmental fate of tetracyclines in swine manure after composting and field application remains largely unknown.This study analyzed the concentrations of tetracyclines in manure,manure-based compost and compost amended soil in selected swine farms from Beijing,Jiaxing and Putian,China to determine the dilution effects of antibiotics when released into the soil environment.The results demonstrate that residues of antibiotics were detected in all samples and chlortetracycline as well as its degradation products should be regarded critically concerning their potential ecotoxicity.Application of manure-based compost to soil could reduce the possible risk posed by antibiotic contamination,but the trigger value of 100 μg/kg was still exceeded in soil samples （776.1 μg/kg dw） from Putian City after application of compost.Field studies such as the present one can help to improve the routine administration of antibiotic-containing composted manure.
基金supported by the Natural Science Foundation of Shaanxi Province (No. 2009jm4002-1)
文摘An efficient method is provided to detect simultaneously some important veterinary drugs from different classes in highly complex animal tissue matrix. This method using matrix solid-phase dispersion (MSPD) and high performance liquid chromatography (HPLC) with diode array detection (DAD) is developed to effectively determine two fiuoroquinolones (enoxacin and lomefioxacin), two sulfonamides (sulfanilamide and sulfamethoxazole) and one tetracycline (tetracycline) simultaneously in porcine tissues. In the process, MSPD methodology was used to treat samples, washed by n-hexane to remove lipid, eluted the analytes with acetonitrile–dichloromethane (1:1, v/v). Solvent acetonitrile and solvent acetic acid (0.1%) were combined in a gradient. HPLC–DAD analysis of the tissue samples was performed within 15 min at a fiow rate of 1.0 mL/min. The results showed that a recovery at 0.1, 0.5 and 1.0 mg/g fortification levels ranged from 80.6% to 99.2% with satisfactory relative standard deviations (RSDs) (below 6.1%, nfi3) and the limits of quantitation (LOQ) ranged from 7 mg/kg to 34 mg/kg in porcine tissues. Utilization of the method in successfully simultaneous analysis of porcine tissue incurred with veterinary drug multiresidues is described.
文摘A rapid, sensitive and specific ultra-high-performance liquid chromatography tandem mass spectrometry （UPLC-MS） method was developed for the analysis of tetracycline antibiotics, including tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and their 4-epimers （4-epiTCs） in agricultural soil fertilized with swine manure. Soil samples were extracted and cleaned-up with 10 mL EDTA-McIlvaine buffer solution （pH 4.0）, then cleaned-up and pre-concentrated using the Oasis MAX cartridge and then eluted with 1 mL solution by mixing formic acid, methanol and water at a ratio of 2：15：83 （v/v/v）. The purified samples were separated by an ACQUITY UPLC BEH C18 column using acetonitrile and water containing 0.1% formic acid mobile phase and detected by a single quadrupole MS. The limits of detection for the soil extraction method （LODsoil） ranged from 0.6-2.5 lag kg-~ with recoveries from 23.3-159.2%. Finally, the method was applied to an agricultural field in an area with intensive pig-fattening farming. Tetracyclines were detected in soil from 2.8 to 42.4 μg kg-1 soil. These results demonstrate that soil from swine farms can become severely contaminated with tetracycline antibiotics and their metabolites.
基金funded by the Ministry of Agriculture of China (2013-Z10)Chinese Academy of Agricultural Sciences (2012ZL071)Institute of Animal Science, Chinese Academy of Agricultural Sciences (2013ywf-yb-4)
文摘This study surveyed 180 samples of ultra high temperature （UHT） milk of four top Chinese dairy brands collected in the 25 cities in China in June 2011, and assessed their contamination with antibiotics, using the ELISA method. The percentages of tetracyclines, sulfonamides, sulfamethazine, and quinolones detected in the samples were 0, 16.7, 40.6, and 100%, respectively. The maximum concentrations of the tetracyclines, sulfonamides, sulfamethazine and quinolones in UHT milk samples were 〈1.5, 26.2, 22.6, and 58.8 μg kg-1, respectively. None of the samples exceeded the maximum residue levels （MRLs） for these four veterinary drugs, according to the regulations set by China, the European Union （EU） and the Codex Alimentarius Commission （CAC）.
基金Supported by Hebei Science and Technology Program(16275507D)
文摘Aiming at the market demand for rapid detection of tetracyclines,fluoroquinolones and sulfonamides in milk,a golloidal gold immunochromatography test strip for simultaneous detection of tetracyclines,fluoroquinolones and sulfonamides in milk was prepared based on the principle of competitive inhibition immunochromatography. The performance indicators of the test strip were verified. The results showed that the test strip can simultaneously detect 4 tetracyclines,13 fluoroquinolones and 13 sulfonamides,and the detection limits all can meet the national residue limits; the tests strip exhibited false positive rate≤5% and false negative rate = 0; and no cross-reaction with other drugs was commonly found in milk,indicating good specificity. The method is simple,rapid,and has low cost and easy popularization. It provides a means for realizing on-site rapid detection and is of important practical significance to guarantee of safety of milk and dairy products in China.
文摘This paper reported an indirect flow injection chemiluminescence （FI-CL） method for the determination of the drugs tetracycline （TC）, chlortetracycline （CTC） and oxytetracycline（OTC） using Cu（ Ⅱ ） as a probe ion. The CL reaction was induced on-line and after injection of the sample the negative peaks appeared as a result of complexation. The method was applied to the determination of TCs in pharmaceuticals and human urine with recoveries in the range95-105%.
基金supported by the Xiamen Science and Technology Planning Project (No. 3502Z20162002)
文摘Tetracyclines（TCs） discharged from livestock wastewater have aroused public concerns due to their pharmacological threats to ecosystems and human health. As an important medium in the wastewater, suspended organic matters（SOMs） play vital roles in antibiotics transport and degradation. However, limited information has been reported in the relevant literature. This study investigated TCs sorption behavior on SOM, withdrawn from swine wastewater. High TCs sorption capacities were detected, with the maximum values ranging from 0.337 to 0.679 mg/g. Increasing p H and temperature led to the decline of sorption capacity. Results from three-dimensional excitation–emission matrix fluorescence spectroscopy and Fourier transform infrared spectrometry revealed that amide and carboxyl groups were the main functional groups for TCs adsorption. The interactions between SOM and TCs were clarified as predominated by hydrogen-bonding and cation-exchange in acid conditions, and electrostatic repulsion in neutral or alkaline conditions. Adsorption kinetics modeling was conducted, and a satisfactory fitting was achieved with the Freundlich equation. These results indicated that the adsorption process was a rather complex process, involving a combination of cation-exchange and hydrogen-bonding. The results will provide a better understanding of the capability of SOM for TCs transport and abatement in the wastewater treatment process.
文摘The presence of tetracyclines in soil and surface water is an emerging concern. The present study was undertaken to investigate remediation of tetracylines (tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC)) from aqueous solution using vetiver grass, water lettuce, and sunflower and root exudates of water lettuce, sunflower and from soil by tomato, Indian mustard and carrot plant. The data of this study denote that vetiver grass, water lettuce, sunflower remedy tetracyclines from water. The remediation % after 63 days of treatment was 87-61 for TC;88-68 for OTC and 87-68 for CTC. The remediation of tetracyclines at lower concentration of antibiotics in presence of root exudates of water lettuce and sunflower was more than 99% and remediation was faster than water lettuce or sunflower. The remediation of tetracyclines from aqueous solution may be due to oxidation of-OH group(s) of tetracycline through a process that is thought to involve reactive oxygen intermediates and/or role of peroxidase enzyme. The plant crops viz., tomato, Indian mustard and carrot can remedy 41%-72% of amended tetracyclines. The maximum bioaccumulation of TC and CTC was in Indian mustard and OTC was maximally bioaccumulated in tomato.
基金the Science and Technology Planning Project of Guangzhou,China(No.201803030040)the National Natural Science Foundation of China(Grant No.41272262)the Major Projects(Natural Science)of Education Department of Guangdong Province,China(261555101).
文摘Antibiotic contamination of the water environment has attracted much attention from researchers because of their potential hazards to humans and ecosystems.In this study,a multi-template molecularly imprinted polymer(MIP)modified mesoporous silica coated magnetic graphene oxide(MGO@MS@MIP)was prepared by the surface imprinting method via a sol-gel process and was used for the selective,efficient and simultaneous removal of tetracyclines(TCs),including doxycycline(DC),tetracycline(TC),chlorotetracycline(CTC)and oxytetracycline(OTC)from water.The synthesized MIP composite was characterized by Fourier transform infrared spectroscopy,transmission electron microscope and thermogravimetric analysis.The adsorption properties of MGO@MS@MIP for these TCs were characterized through adsorption kinetics,isotherms and selectivity tests.The MIP composite revealed larger adsorption quantities,excellent selectivity and rapid kinetics for these four tetracyclines.The adsorption process was spontaneous and endothermic and followed the Freundlich isotherm model and the pseudo-second-order kinetic model.The MGO@MS@MIP could specifically recognize DC,TC,CTC and OTC in the presence of some chemical analogs.In addition,the sorption capacity of the MIP composite did not decrease significantly after repeated application for at least five cycles.Thus,the prepared magnetic MIP composite has great potential to contribute to the effective separation and removal of tetracyclines from water.
文摘AgVO_(3)/ZIF-8 composites with enhanced photocatalytic effect were prepared by the combination of AgVO_(3)and ZIF-8.X-ray diffraction(XRD),scanning electron microscopy(SEM),high-power transmission electron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),photoluminescence(PL)spectroscopy,electron spin resonance(ESR)spectroscopy,transient photocurrent and electrochemical impedance spectroscopy(EIS)were used to characterize binary composites.Tetracycline(TC)was used as a substrate to study the performance efficiency of the degradation of photocatalysts under light conditions,and the degradation effect of TC was also evaluated under different mass concentrations and ionic contents.In addition,we further investigated the photocatalytic mechanism of the binary composite material AgVO_(3)/ZIF-8 and identified the key active components responsible for the catalytic degradation of this new photocatalyst.The experimental results show that the degradation efficiency of 10%-AZ,prepared with a molar ratio of 10%AgVO_(3)and ZIF-8 to TC,was 75.0%.This indicates that the photocatalytic activity can be maintained even under a certain ionic content,making it a suitable photocatalyst for optimal use.In addition,the photocatalytic mechanism of binary composites was further studied by the active species trapping experiment.
文摘A determination method has been optimized and validated for the simultaneous analysis of tetracycline （TC）, oxytetracycline （OTC）, chlortetracycline （CTC） and doxycycline （DC） in honey. Tetracyclines （TCs） were removed from honey samples by chelation with metal ions bound to small Chelating Sepharose Fast Flow columns and eluted with Na2EDTA-Mcllvaine pH 4.0 buffers. Extracts were further cleaned up by Oasis HLB solid-phase extraction （SPE）, while other solid-phase extraction cartridges were compared. Chromatographic separation was achieved using a polar end-capped C 18 column with an isocratic mobile phase consisting of oxalic acid, acetonitrile and methanol. LC with ultraviolet absorbance at 355 nm resulted in the quantitation of all four tetracycline residues from honey samples fortified at 15, 50, and 100 ng/g, with liner ranges for tetracyclines of 0.05 to 2 μg/mL. Mean recoveries for tetracyclines were greater than 50% with R.S.D. values less than 10% （n= 18）. Detection limits of 5, 5, 10, 10 ng/g for oxytetracycline, tetracycline, chlortetracycline and doxycycline, respectively and quantitation limits of 15 ng/g for all the four tetracyclines were determined. Direct confirmation of the four residues in honey （2-50 ng/g） was realized by liquid chromatography-tandem mass spectrometry （LC/MS/MS）. The linear ranges of tetracyclines determined by LC/MS/MS were between 5 to 300 ng/mL, with the linear correlation coefficient r〉 0.995. The limits of detection of 1 to 2 ng/g were obtained for the analysis of the TCs in honey.
文摘For environmental applications,it is crucial to rationally design and synthesize photocatalysts with positive exciton splitting and interfacial charge transfer.Here,a novel Agbridged dual Z-scheme Ag/g-C_(3)N_(4)/CoNi-LDH plasmonic heterojunction was successfully synthesized using a simple method,with the goal of overcoming the common drawbacks of traditional photocatalysts such as weak photoresponsivity,rapid combination of photogenerated carriers,and unstable structure.These materials were characterized by XRD,FT-IR,SEM,TEM UV-Vis/DRS,and XPS to verify the structure and stability of the heterostructure.The pristine LDH,g-C_(3)N_(4),and Ag/g-C_(3)N_(4)/CoNi-LDH composite were investigated as photocatalysts for water remediation,an environmentally motivated process.Specifically,the photocatalytic degradation of tetracycline was studied as a model reaction.The performance of the supports and composite catalyst were determined by evaluating both the degradation and adsorption phenomenon.The influence of several experimental parameters such as catalyst loading,pH,and tetracycline concentrationwere evaluated.The current study provides important data for water treatment and similar environmental protection applications.
基金Project supported by the National Natural Science Foundation of China(22206080)the Natural Science Foundation of Jiangsu(SBK2022041070)+1 种基金the Science and Technology Project of Henan Province(232102321050,232102321035)the International Science,Innovators,Technology Cooperation Projects of Henan Province(232102521009)。
文摘Metal-organic frameworks(MOFs)and their derivatives have gained significant attention in recent years for their ability to catalyze the advanced oxidation of persulfates.Cerium-doped MOFs,in particular,have shown promise due to their high catalytic efficiency,practical applicability,and cost-effectiveness.However,their structure,catalytic properties,and mechanisms are not yet fully understood.ZIF-8 was chosen as the raw material to prepare cerium-doped hollow carbon nano fibers(Ce-HCNFs)using the electrostatic spinning-calcination method.The objective is to investigate the structure,catalytic performance,and catalytic mechanism of Ce-HCNFs.The results show that Ce-HCNFs catalyzed the degradation of tetracycline(TC)by persulfate up to 76.9%,Quenching experiments and electron paramagnetic resonance experiments indicate the dominant role of single-linear oxygen.Furthermore,the experiments on the influence factor and cycling demonstrate the exceptional stability and recycling capability of Ce-HCNFs in real-world water environments.
基金supported by the Natural Science Foundation of Tianjin(Nos.18JCQNJC72400 and 22JCQNJC01510).
文摘Tetracycline(TC)is a broad-spectrum antibiotic,and its residues in the environment and food are harmful to human health.Therefore,it is essential to rapidly,sensitively,and conveniently detect TC.In this work,we developed a portable silicon nanoparticles chelated Europium(Ⅲ)-based polyacrylonitrile(Eu-SiNPs/PAN)nanofiber membrane for rapid,sensitive,and convenient detection of TC.The Eu-SiNPs were synthesized with a facile one-pot method.The Eu-SiNPs/PAN nanofiber membrane was fabricated by electrospinning,combining Eu-SiNPs and PAN with three-dimensional porous membrane structures and UV resistance.Both the Eu-SiNPs and the Eu-SiNPs/PAN nanofiber membranes have good selectivity and anti-interference ability towards TC.The combined merits of rapid response,long storage life,easy portability,and naked-eye recognition of TC make the Eu-SiNPs/PAN nanofiber membrane a promising material for convenient TC detection applications.The practicability of these nanofiber membranes was further verified by detecting TC in real samples,such as lake water,drinking water and honey,and achieved quantitative detection.
基金Project supported by the Science and Technology Project of Henan Province(242102321048,242102321045,232102320211)National Natural Science Foundation of China(22206080)+2 种基金Natural Science Foundation of Jiangsu(SBK2022041070)International Science and Technology Cooperation Projects of Henan Province(232102521009)Natural Science Youth Foundation of Henan Province(232300420336)。
文摘A series of CeO_(2)@MnO_(2)composites was prepared by deposition-precipitation methods.These materials were used to activate sodium persulfate(PDS)for the oxidation of tetracycline.It is found that the composites,especially the CeO_(2)@MnO_(2)-1:4 composites,exhibit better tetracycline removal rates than the pure components.X-ray diffraction(XRD),Raman and scanning electron microscopy(SEM)analyses all indicate that the composite has been successfully prepared with high purity and high crystalline.The XPS analysis shows that the strong interaction between the components promotes the electron transfer.Additionally,the kinetic rate constants of CeO_(2)@MnO_(2)-1:4 after 60 min are 3.8 and 12.7 times higher than pure CeO_(2)and MnO_(2),respectively.CeO_(2)@MnO_(2-)1:4 composite also exhibits excellent catalytic activity for individual and hybrid pollutants.The effects of wastewater matrix,pH,circulation and ion stre ngth on the degradation of tetracycline were investigated.It is found that CeO_(2)@MnO_(2)-1:4 composite has good practical application prospects.CeO_(2)@MnO_(2)composites with synergistic adsorption catalysis can activate PDS and peroxymo no sulfate(PMS)for efficient organic catalytic oxidation.This paper provides the theoretical basis and data support for the practical application of the CeO_(2)@MnO_(2)composite materials.
文摘Herein,a luminescent europium-based metal-organic framework(Eu-MOF,[Eu_(3)(L)(HL)(NO_(3))_(2)(DMF)_(2)]·4DMF·5H_(2)O,H_(4)L=5,5′-(pyrazine-2,6-diyl)diisophthalic acid,DMF=N,N-dimethylformamide)was developed for the dual-functional detection of environmental pollutants.This fluorescence-quenching-based sensor exhibited excep-tional sensitivity for both 2,4,6-trinitrophenol(TNP)and tetracycline(TC),achieving remarkably low detection lim-its of 1.96×10^(-6)and 1.71×10^(-7)mol·L^(-1),respectively.Notably,the system exhibited 99%fluorescence quenching ef-ficiency for TC,indicating ultra-efficient analyte recognition.The detection performance surpasses most reported lu-minescent MOF sensors,attributed to synergistic mechanisms of fluorescence resonance energy transfer(FRET)and photoinduced electron transfer(PET).CCDC:2446483.
基金Supported by the An Nan Hospital,China Medical University,No.ANHRF114-20 and No.ANHRF114-21.
文摘BACKGROUND Antibiotic resistance significantly impacts the treatment failure rates of Helicobacter pylori(H.pylori)infections.AIM To investigate the trends in primary antibiotic resistance of H.pylori in Taiwan of China over the past six years.METHODS We conducted a retrospective analysis of H.pylori isolates from Taiwan residents,China who had not undergone previous treatments(n=1408),collected between January 1,2019 and December 31,2024.Susceptibility of these strains to amoxicillin,clarithromycin,levofloxacin,metronidazole,and tetracycline was tested using the Epsilometer test.We analyzed the trends in single and dual resistance profiles over the study period,and compared antibiotic resistance across different regions(northern,southern and eastern areas)of Taiwan of China.RESULTS The overall resistance rates for H.pylori to amoxicillin,clarithromycin,metronidazole,tetracycline,and levofloxacin in Taiwan of China were 1.3%,18.0%,31.0%,0.8%,and 28.7%,respectively.Tetracycline resistance increased significantly from 0%in 2019 to 3.5%in 2024(P value inχ^(2)test for linear trend:<0.001),while metronidazole resistance declined from 35.5%to 13.0%(P value inχ^(2)test for linear trend:<0.001).No significant changes of amoxicillin,clarithromycin and levofloxacin resistances were observed.The dual resistances to clarithromycin plus tetracycline,and metronidazole plus tetracycline both increased significantly from 0%to 1.7%from 2019 to 2024(P value inχ^(2)test for linear trend:<0.05).Furthermore,no significant regional differences in resistance frequencies except for levofloxacin were detected.CONCLUSION Primary antibiotic resistance to tetracycline in H.pylori has increased in Taiwan of China from 2019 to 2024,while resistance to metronidazole has decreased during the same period.The dual resistance to clarithromycin plus tetracycline and metronidazole plus tetracycline both increased significantly.
基金supported by National Natural Science Foundation of China(No.22171040)Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program(No.RC230784)+1 种基金Guangdong Basic and Applied Basic Research Foundation(No.2023A1515140011)Fundamental Research Funds for the Central Universities,China(No.N2305017)。
文摘Metal halide perovskite nanocrystals(MHP NCs)are of great candidates in photocatalytic applications due to their extreme light utilization efficiency.However,the instability towards humid environment severely restrict their practical application.Herein,the CsPbBr_(3)/CsPb_(2)Br_(5)heteronanocrystals(HNCs)were successfully encapsulated into ZIF-8 through a thermal injection method via controlling the molar ratio of Cs^(+)/Pb2^(+).The surface of ZIF-8 was then modified with hydrophobic copolymer of poly(methyl methacrylate)(PMMA)to improve the water stability.Benefiting from the intimate interfacial interaction and staggered energy band structure,the type-II heterojunction of CsPb Br_(3)/CsPb_(2)Br_(5)guarantees efficient separation and migration of photogenerated electron/hole pairs.Meanwhile,the formation of Z-scheme heterojunction between ZIF-8 and CsPbBr_(3)/CsPb_(2)Br_(5)HNCs contributes to the adsorption and enrichment of pollutants,further accelerates the photocatalytic antibiotic degradation efficiency towards tetracycline hydrochloride(TCH)in aqueous solution.Nearly 87%of TCH(40 mg/L,50 mL)was degraded by 40 mg catalyst within 100 min.This work offers a feasible approach in assembling high-performance MHP NCsbased efficient photocatalyst with expanding application in aqueous solution.
文摘Tetracycline hydrochloride(TCH)exists in various forms in aqueous solution due to pH changes,which not only alters the reactivity of TCH,but also affects the process of reactive oxygen species(ROS)attacking the molecule.Therefore,the rational design of piezo-photocatalytic materials coupled with a comprehensive understanding of the degradation mechanisms of various TCH species constitutes a critical approach to addressing tetracycline antibiotic contamination.In the design and preparation of piezo-photocatalysts,controlling the oxygen vacancy concentration is crucial as it governs the coupling efficiency between piezoelectric response and photocatalytic activity,as well as the strength of spontaneous polarization.Meanwhile,the morphology of the material is a key factor influencing the migration pathways of charge carriers.In this work,hollow spherical Bi_(4)Ti_(3)O_(12) was synthesized using an inorganic titanium source,demonstrating exceptional piezo-photocatalytic activity.The degradation rate was 1.57 and 5.29 times higher than that of traditional spherical and plate-like morphologies,with a rate constant of k=0.127.In an innovative approach,density functional theory calculations of local softness and hyper-softness were employed to analyze the reactivity changes of TCH in its different deprotonated states toward reactive oxygen species.Combined with molecular electronegativity analysis,the factors influencing the degradation efficiency were identified.This study provides a solid foundation for developing efficient and environmentally friendly piezo-photocatalysts and offers new insights into the degradation mechanism of TCH.
基金financial support of the National Natural Science Foundation of China(U23A6005,22038004 and 22178069).
文摘The emission of organic pollutants from the dye industry and medical treatment represents a significant threat to the quality of water resources and human health.The development of green,environmentally friendly and efficient photocatalysts for the removal of organic pollutants from the environment is of paramount importance in addressing these issues.Flower-like lignin-derived carbon(LC)/zinc oxide(ZnO)composites with controllable morphology were synthesized via a direct precipitation method.In this study,alkali lignin was employed as an anionic active agent to alter the molecular arrangement on the liquid surface during the synthesis reaction and to reduce the surface tension between mixtures,thereby forming a special stacked morphology,which was then used for the highly efficient removal of methylidene blue(MB)and tetracycline hydrochloride(TCH)in water under different light conditions.The formation mechanism of LC/ZnO and the degradation characteristics under different reaction conditions were investigated.The loading of LC can form composites with large specific surface area and rich porous structure.In addition,with the help of lignin,the morphology of ZnO was changed from a rod-like structure to a lamellar structure,and LC could effectively reduce the band gap of ZnO,which could improve the electron transfer rate in the photocatalytic process.The·O_(2)^(-)and·OH radicals generated under photoexcitation promoted the decomposition of pollutants.This study presents a simple,economical,and scalable method for the application of photocatalysts and explores new ways for the high-value application of industrial lignin.
