The pollution especially organic dyes pollution of water resources is an urgent issue to be solved.It is crucial to develop highly efficient,low cost and recyclable heterogeneous catalysts for wastewater treatment.In ...The pollution especially organic dyes pollution of water resources is an urgent issue to be solved.It is crucial to develop highly efficient,low cost and recyclable heterogeneous catalysts for wastewater treatment.In this study,a heterogeneous Fenton catalyst loaded with Fe_(3)O_(4)nanoparticles was prepared by one step pyrolysis using natural crop waste corncob as carbon source.The prepared porous carbon catalyst can effectively degrade methyl orange(MO,25 mg·L^(-1))at room temperature,and the degradation rate is 99.7%.In addition to high catalytic degradation activity,the layered porous carbon structure of the catalyst also provides high stability and reusability.The degradation rate can be maintained above 93%after 10 cycles.Furthermore,the prepared catalyst is magnetic,which makes the catalyst easy to recycle in practical applications.In addition,the prepared Fe3O4/RCC catalyst has efficient Fenton degradation activity for bisphenol A(BPA)(96.9%)and antibiotic tetracycline hydrochloride(TC-HCl)(95.5%),which proves that it has universal applicability for the degradation of most organic pollutants.This study provides a feasible and scalable strategy to prepare a heterogeneous Fenton catalyst treating wastewater and high-value utilization of biomass waste.展开更多
Neutral H_(2)O_(2)electro synthesis via two-electron oxygen reduction reaction(2e^(-)-ORR)is a promising alternative to replace traditional anthraquinone processes.However,it still remains significantly challenging to...Neutral H_(2)O_(2)electro synthesis via two-electron oxygen reduction reaction(2e^(-)-ORR)is a promising alternative to replace traditional anthraquinone processes.However,it still remains significantly challenging to develop efficient electrocatalysts due to sluggish neutral2e^(-)-ORR kinetics.Herein,we reported abundant ultrafine Co/Co_(2)O_(3)nanoparticles(NPs)anchored oxidic nitrogendoped carbon nanotubes(Co/Co_(2)O_(3)@OCNT)derived from the pyrolysis of the mixed OCNT and Co@Tpy,presenting synergistical enhancement effect on the water dissociation to supply active hydrogen coupling with O_(2)to produce H_(2)O_(2)at positive onset potential of 0.66 V vs.RHE.As a result,Co/Co_(2)O_(3)@OCNT achieves a record current density of 4.0 mA cm^(-2)at 0.2 V vs.RHE and nearly 100%H_(2)O_(2)selectivity at the potential from 0 to 0.5 V vs.RHE.In situ observations demonstrated that ultrafine Ci/Co_(2)O_(3)NPs and nitrogen-doped carbon supports would synergistic ally improve the active hydrogen feeding further to facilitate the formation of key intermediate*OOH.Furthermore,based on the sandwiched configuration of the flow cell,Co/Co_(2)O_(3)@OCNT shows a superior performance with the yield rate of salt-free aqueous H_(2)O_(2)solution around63.4 mol gcat^(-1)h^(-1)at 200 mA cm^(-2)and the corresponding Faradaic efficiency of 85%.Moreover,integration of Co/Co_(2)O_(3)@OCNT into this cell achieves high real-time production concentration of H_(2)O_(2)around 20 mM at 200 mA cm^(-2)by varying the pure water flow rate to1 mL min-1,suggesting the huge potential of salt-free H_(2)O_(2)solution production.This work provides a novel strategy for developing efficient neutral electrocatalysts and feasible process of neutral H_(2)O_(2)production.展开更多
Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE...Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE)of phototheranostic agents(PTAs)is the key factor for phototheranostic systems.Herein,we provided an efficient method to improve PCE and constructed a biocompatible nano-material ICR-Qu@NH_(2)-Fe_(3)O_(4)@PEG(QNFP)by combing near-infrared second region(NIR-Ⅱ)molecular dye ICR-Qu and amino-modified magnetic nanoparticles and then encapsulated by DSPE-m PEG2000.QNFP exhibited excellent performance for photothermal therapy with a high PCE of 95.6%.Both in vitro and in vivo experiments indicated that QNFP could inhibit the growth of tumors under laser irradiation with low toxicity and realized real-time NIR-Ⅱfiuorescent imaging of tumors.In general,we realized a simple but efficient method to improve the PCE of NIR-Ⅱmolecular dye without reduce its quantum yield,which is an ideal choice for cancer diagnosis and treatment.展开更多
In this work,we report a fabrication of recyclable iron oxide decorated MoS_(2)nanosheets via a facile liq-uid exfoliation approach and solvothermal reaction for visible-light photodegradation of tetracycline.The prep...In this work,we report a fabrication of recyclable iron oxide decorated MoS_(2)nanosheets via a facile liq-uid exfoliation approach and solvothermal reaction for visible-light photodegradation of tetracycline.The prepared Fe_(3)O_(4)-MoS_(2)was characterized by X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectros-copy,Raman spectroscopy,magnetic hysteresis,and nitrogen adsorption-desorption isotherms.Experimental results indicate that,successful attachment of Fe_(3)O_(4)nanoparticles to MoS_(2)sheets has been achieved.The enhanced surface area of Fe_(3)O_(4)-MoS_(2)induced high rates of adsorption and the adsorbed tetracycline was degraded to 90%after 150 min of visible exposure,which is better than that from pure MoS_(2).The introduction of Fe_(3)O_(4)not only enhances the photo-catalytic performance of Fe_(3)O_(4)-MoS_(2),but also enables its convenient recovery from water by an external magnetic field.Furthermore,both the photocatalytic activity and composite phase of Fe_(3)O_(4)-MoS_(2)were well-retained over cy-cles.Owing to its efficient photocatalytic activity,good stability and magnetic recyclability,the Fe_(3)O_(4)-MoS_(2)nano-composite is considered to be a promising photocatalyst for wastewater treatment.展开更多
基金supported by the National Natural Science Foundation of China(51572124)Natural Science Foundation of China Jiangsu Province(BK20230940)+2 种基金the Fundamental Research Funds for the Central Universities(30920130121001)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD,China)a project funded by Jiangsu Funding Program for Excellent Postdoctoral Talent.
文摘The pollution especially organic dyes pollution of water resources is an urgent issue to be solved.It is crucial to develop highly efficient,low cost and recyclable heterogeneous catalysts for wastewater treatment.In this study,a heterogeneous Fenton catalyst loaded with Fe_(3)O_(4)nanoparticles was prepared by one step pyrolysis using natural crop waste corncob as carbon source.The prepared porous carbon catalyst can effectively degrade methyl orange(MO,25 mg·L^(-1))at room temperature,and the degradation rate is 99.7%.In addition to high catalytic degradation activity,the layered porous carbon structure of the catalyst also provides high stability and reusability.The degradation rate can be maintained above 93%after 10 cycles.Furthermore,the prepared catalyst is magnetic,which makes the catalyst easy to recycle in practical applications.In addition,the prepared Fe3O4/RCC catalyst has efficient Fenton degradation activity for bisphenol A(BPA)(96.9%)and antibiotic tetracycline hydrochloride(TC-HCl)(95.5%),which proves that it has universal applicability for the degradation of most organic pollutants.This study provides a feasible and scalable strategy to prepare a heterogeneous Fenton catalyst treating wastewater and high-value utilization of biomass waste.
基金financially supported by the National Natural Science Foundation of China(No.22466010)Guizhou Provincial Basic Research Program(Natural Science)(No.ZK[2023]47)+4 种基金key program(No.ZD[2025]075)the Innovation and Entrepreneurship Project for overseas Talents in Guizhou Province[2022]02Specific Natural Science Foundation of Guizhou University(No.X202207)the National Undergraduate Innovation and Entrepreneurship Training Program(Nos.gzugc2023006 and gzusc2024012)the SRT project of Guizhou University(No.2023SRT029)
文摘Neutral H_(2)O_(2)electro synthesis via two-electron oxygen reduction reaction(2e^(-)-ORR)is a promising alternative to replace traditional anthraquinone processes.However,it still remains significantly challenging to develop efficient electrocatalysts due to sluggish neutral2e^(-)-ORR kinetics.Herein,we reported abundant ultrafine Co/Co_(2)O_(3)nanoparticles(NPs)anchored oxidic nitrogendoped carbon nanotubes(Co/Co_(2)O_(3)@OCNT)derived from the pyrolysis of the mixed OCNT and Co@Tpy,presenting synergistical enhancement effect on the water dissociation to supply active hydrogen coupling with O_(2)to produce H_(2)O_(2)at positive onset potential of 0.66 V vs.RHE.As a result,Co/Co_(2)O_(3)@OCNT achieves a record current density of 4.0 mA cm^(-2)at 0.2 V vs.RHE and nearly 100%H_(2)O_(2)selectivity at the potential from 0 to 0.5 V vs.RHE.In situ observations demonstrated that ultrafine Ci/Co_(2)O_(3)NPs and nitrogen-doped carbon supports would synergistic ally improve the active hydrogen feeding further to facilitate the formation of key intermediate*OOH.Furthermore,based on the sandwiched configuration of the flow cell,Co/Co_(2)O_(3)@OCNT shows a superior performance with the yield rate of salt-free aqueous H_(2)O_(2)solution around63.4 mol gcat^(-1)h^(-1)at 200 mA cm^(-2)and the corresponding Faradaic efficiency of 85%.Moreover,integration of Co/Co_(2)O_(3)@OCNT into this cell achieves high real-time production concentration of H_(2)O_(2)around 20 mM at 200 mA cm^(-2)by varying the pure water flow rate to1 mL min-1,suggesting the huge potential of salt-free H_(2)O_(2)solution production.This work provides a novel strategy for developing efficient neutral electrocatalysts and feasible process of neutral H_(2)O_(2)production.
基金financially supported by the National Natural Science Foundation of China(Nos.U21A20308,22077088)Foundation from Science and Technology Major Project of Tibetan Autonomous Region of China(No.XZ202201ZD0001G)Foundation from Science and Technology Department of Sichuan Province(No.2021ZHCG0025)。
文摘Photoheranostics have emerged as a promising tool for cancer theranostics owing to their real-time feedback on treatment and their precise diagnosis.Among them,how to improve the photothermal conversion efficiency(PCE)of phototheranostic agents(PTAs)is the key factor for phototheranostic systems.Herein,we provided an efficient method to improve PCE and constructed a biocompatible nano-material ICR-Qu@NH_(2)-Fe_(3)O_(4)@PEG(QNFP)by combing near-infrared second region(NIR-Ⅱ)molecular dye ICR-Qu and amino-modified magnetic nanoparticles and then encapsulated by DSPE-m PEG2000.QNFP exhibited excellent performance for photothermal therapy with a high PCE of 95.6%.Both in vitro and in vivo experiments indicated that QNFP could inhibit the growth of tumors under laser irradiation with low toxicity and realized real-time NIR-Ⅱfiuorescent imaging of tumors.In general,we realized a simple but efficient method to improve the PCE of NIR-Ⅱmolecular dye without reduce its quantum yield,which is an ideal choice for cancer diagnosis and treatment.
文摘In this work,we report a fabrication of recyclable iron oxide decorated MoS_(2)nanosheets via a facile liq-uid exfoliation approach and solvothermal reaction for visible-light photodegradation of tetracycline.The prepared Fe_(3)O_(4)-MoS_(2)was characterized by X-ray diffraction,transmission electron microscopy,X-ray photoelectron spectros-copy,Raman spectroscopy,magnetic hysteresis,and nitrogen adsorption-desorption isotherms.Experimental results indicate that,successful attachment of Fe_(3)O_(4)nanoparticles to MoS_(2)sheets has been achieved.The enhanced surface area of Fe_(3)O_(4)-MoS_(2)induced high rates of adsorption and the adsorbed tetracycline was degraded to 90%after 150 min of visible exposure,which is better than that from pure MoS_(2).The introduction of Fe_(3)O_(4)not only enhances the photo-catalytic performance of Fe_(3)O_(4)-MoS_(2),but also enables its convenient recovery from water by an external magnetic field.Furthermore,both the photocatalytic activity and composite phase of Fe_(3)O_(4)-MoS_(2)were well-retained over cy-cles.Owing to its efficient photocatalytic activity,good stability and magnetic recyclability,the Fe_(3)O_(4)-MoS_(2)nano-composite is considered to be a promising photocatalyst for wastewater treatment.
