Pig bedding biochar(PBBC)and Cd-enriched Perilla frutescenswere used for joint remediation of Cd-contaminated soil.Cd-contaminated soil was treated with different concentration of PBBC.The physiological and biochemica...Pig bedding biochar(PBBC)and Cd-enriched Perilla frutescenswere used for joint remediation of Cd-contaminated soil.Cd-contaminated soil was treated with different concentration of PBBC.The physiological and biochemical indicators of P.frutescens was evaluated under different Cd stress,including biomass,antioxidant system.Meanwhile Cd bioavailability,enzyme activity and nutrient bioavailability of the soil were monitored.Results revealed that PBBC at 1%and 5%levels led to decreased diethylenetriaminepentaacetic acid-extractable Cd(DTPA-Cd)content in soil by 19.09%-20.05%and 30.10%-47.08%,respectively.Moreover,PBBC promoted the transformation of exchangeable Cd(EXC-Cd)into a more stable form,enhanced soil enzymes(peroxidase,acid phosphatase,urease,and sucrase)activities,and alleviated P.frutescens's oxidative stress.PBBC increased its biomass,consequently enhancing Cd accumulation in the plant's,thereby improving Phytoextraction rate(PER).1%PBBC showed the best effect,with a total biomass increased 21.42%-26.94%,PERwas enhanced by 39.83%-54.82%.This study justifies that the combining PBBC with P.frutescens enhances Cd removal fromsoil,making the PBBC-P.frutescens a promising choice for treating Cd-polluted soil.展开更多
Achieving heterogeneous photocatalytic activation of sp^(3)C-H bonds and carboxylation of CO_(2)to produce arylacetic acids and alkyl carboxylic acids with increased carbon chains is a highly significant and demanding...Achieving heterogeneous photocatalytic activation of sp^(3)C-H bonds and carboxylation of CO_(2)to produce arylacetic acids and alkyl carboxylic acids with increased carbon chains is a highly significant and demanding research endeavor.In this work,a new method for synthesizing redox centers spatially separated Z-scheme CdS@graphitic carbon nitride(g-C_(3)N_(4))was developed,aiming to achieve photocatalytic benzylic and aliphatic sp^(3)C-H activation as well as CO_(2)carboxylation without sacrificial agent.Notably,both benzylic and aliphatic sp^(3)C-H activation together with CO_(2)carboxylation were achieved in heterogeneous photocatalytic system,resulting in the production of carboxylic acids with increased carbon chains under mild conditions.Various methylbenzene derivatives and cycloalkanes were employed to synthesize carbon-chain increased acids via a process involving K_(3)PO_(4)-assisted photogenerated holes activation for benzyl radical generation,photoinduced CO_(2)reduction,as well as solvent-assisted chemoselective carboxylation.Various characterizations and density functional theory(DFT)results revealed that Z-scheme CdS@g-C_(3)N_(4)not just significantly enhanced separation of charges and accumulation of photoinduced electrons on g-C_(3)N_(4)but also facilitated adsorption along with activation of CO_(2).This research provided novel heterogeneous photocatalytic approach to produce carbon chains increased carboxylic acids via sp^(3)C-H activation and CO_(2)carboxylation.展开更多
To implement the principle of utilizing waste to address waste issues,porous carbon catalytic materials,prepared through a straightforward process involving NaOH-assisted microwave pyrolysis of ubiquitous waste plasti...To implement the principle of utilizing waste to address waste issues,porous carbon catalytic materials,prepared through a straightforward process involving NaOH-assisted microwave pyrolysis of ubiquitous waste plastics,were employed to degrade pollutants via peroxymonosulfate(PMS) activation.Polyethylene terephthalate(PET) derived P_(1)S_(2) exhibited characteristics of defects enrichment and C=O formation,while H_(1)S_(2),prepared by carbonization of high-density polyethylene(HDPE),possessed a large number of C-OH and defects.Metal-free catalysts P_(1)S_(2) and H_i S_(2) exhibited excellent tetracycline(TC) degradation performance,with the rate constants up to 0.303 min^(-1) and 0.235 min^(-1).Interestingly,mechanism studies demonstrated that the types of waste plastic precursor had a significant impact on the pathways involved in TC degradation.Specifically,carbon defects in p_(1)S_(2) dominated the electron transfer nonradial degradation pathway of TC;However,C-OH in H_(1)S_(2) served as the reactive site for main active species SO_(4)^(·-)/^(·)OH generation,initiating a free radical pathway.In addition,by combining Fukui function calculation and LC-MS test during the TC degradation process,the vulnerable sites attacked by active species were identified;different degradation routes of TC in nonradial and radial pathways were proposed and discussed.Furthermore,the toxicity of all intermediates was analyzed using the toxicity assessment software.This study offers fresh insights into the critical role of carbocatalysts derived from various waste plastics in both nonradical and radical activation processes of PMS.展开更多
All-inorganic cesium lead halide perovskite nanocrystals(CsPbX_(3),X=Cl,Br,I)have attracted considerable scientific and technological interest due to their precise bandgap tunability,high color purity and efficient lu...All-inorganic cesium lead halide perovskite nanocrystals(CsPbX_(3),X=Cl,Br,I)have attracted considerable scientific and technological interest due to their precise bandgap tunability,high color purity and efficient luminescence.Nevertheless,their poor stability in harsh conditions such as moisture,ultraviolet(UV)light irradiation and high temperature,is a major obstacle for their further commercial applications.Herein,by simply using a new type of precursor,namely“HPbX_(3)”(X=Cl,Br,I),we can achieve the coordination equilibrium for Pb precursors during reaction and obtain high-quality perovskite nanocrystals with tremendously enhanced luminous efficiency and chemical stability based on hot-injection method.The prepared a-CsPbb nanocrystals exhibit an extremely high photoluminescence quantum yield of 96%and keep stable in air for more than two months without any post-synthesis treatment.Moreover,stability evaluations under UV light irradiation,water or thermal impact are also performed and the results show substantially improved stability of these nanocrystals as compared with the samples prepared using traditional Pbl_(2) as precursor.Through temperature-dependent(10-300 K)steady and transient spectral analysis combined with compositional measurements,it is revealed that the lower structural defect density,which is guaranteed by abundant halogen when using HPbX3 as precursor,is the most important reason for such performance enhancement.展开更多
For more than three decades, the quest for superconductivity in nickel oxides, also known as nickelates, has symbolized the unwavering dedication in search for an analogy to the Nobe Prize-winning high-temperature sup...For more than three decades, the quest for superconductivity in nickel oxides, also known as nickelates, has symbolized the unwavering dedication in search for an analogy to the Nobe Prize-winning high-temperature superconducting copper oxides, or cuprates [1].展开更多
Lactobacillus acidophilus GIM1.208(LA)can greatly improve the volatile flavor and sensory scores of Rosa roxburghii Tratt(RRT),while its effects on nonvolatile flavor and active compounds remains uncertain.Therefore,t...Lactobacillus acidophilus GIM1.208(LA)can greatly improve the volatile flavor and sensory scores of Rosa roxburghii Tratt(RRT),while its effects on nonvolatile flavor and active compounds remains uncertain.Therefore,this study used widely targeted metabolomics to comprehensively analyze the effects of LA on flavor and activity of RRT.After being fermented by LA,the total phenolics and flavonoids content of RRT increased,while the total triterpenoids content slightly decreased.The total antioxidant activity rose by 35.23%,and hypoglycemic activity expressed through α-amylase and α-glucosidase inhibitory activities increased by 51.66% and 24.95%,respectively.A total of 1635 metabolites were identified,including amino acids,phenolic acids,flavonoids,and triterpenes,and 205 different metabolites were screened.The analysis of potential taste-related metabolites among differential metabolites revealed a reduction in amino acid content,while the majority of organic acids and sugars exhibited an increase.The electronic-tongue and electronic-nose showed that LA reduces bitterness and astringency while enhancing the aroma of RRT,indicating changes in flavor compounds lead to improved flavor quality.Additionally,LA can hydrolyze glycoside compounds in RRT and release glycosides with higher activity,which contributes to its increased antioxidant and hypoglycemic effects.In summary,LA induced alterations in the flavor compounds and glycosides of RRT,thereby improved its flavor and activity.This study can serve as a reference for future research on the flavor and activity of RRT,as well as for production quality control.展开更多
基金supported by the Science and Technology Innovation of Fujian Agriculture and Forestry University(Nos.KFB23079 and KFB23065).
文摘Pig bedding biochar(PBBC)and Cd-enriched Perilla frutescenswere used for joint remediation of Cd-contaminated soil.Cd-contaminated soil was treated with different concentration of PBBC.The physiological and biochemical indicators of P.frutescens was evaluated under different Cd stress,including biomass,antioxidant system.Meanwhile Cd bioavailability,enzyme activity and nutrient bioavailability of the soil were monitored.Results revealed that PBBC at 1%and 5%levels led to decreased diethylenetriaminepentaacetic acid-extractable Cd(DTPA-Cd)content in soil by 19.09%-20.05%and 30.10%-47.08%,respectively.Moreover,PBBC promoted the transformation of exchangeable Cd(EXC-Cd)into a more stable form,enhanced soil enzymes(peroxidase,acid phosphatase,urease,and sucrase)activities,and alleviated P.frutescens's oxidative stress.PBBC increased its biomass,consequently enhancing Cd accumulation in the plant's,thereby improving Phytoextraction rate(PER).1%PBBC showed the best effect,with a total biomass increased 21.42%-26.94%,PERwas enhanced by 39.83%-54.82%.This study justifies that the combining PBBC with P.frutescens enhances Cd removal fromsoil,making the PBBC-P.frutescens a promising choice for treating Cd-polluted soil.
基金financially supported by Natural Science Foundation Project of CQ(No.CSTB2023NSCQ-LZX0067)Science and Technology Research Program of Chongqing Municipal Education Commission(No.KJZD-K202200804)+1 种基金Venture&Innovation Support Program for Chongqing Overseas Returnees(No.cx2020113)National Natural Science Foundation of China(No.21201184).
文摘Achieving heterogeneous photocatalytic activation of sp^(3)C-H bonds and carboxylation of CO_(2)to produce arylacetic acids and alkyl carboxylic acids with increased carbon chains is a highly significant and demanding research endeavor.In this work,a new method for synthesizing redox centers spatially separated Z-scheme CdS@graphitic carbon nitride(g-C_(3)N_(4))was developed,aiming to achieve photocatalytic benzylic and aliphatic sp^(3)C-H activation as well as CO_(2)carboxylation without sacrificial agent.Notably,both benzylic and aliphatic sp^(3)C-H activation together with CO_(2)carboxylation were achieved in heterogeneous photocatalytic system,resulting in the production of carboxylic acids with increased carbon chains under mild conditions.Various methylbenzene derivatives and cycloalkanes were employed to synthesize carbon-chain increased acids via a process involving K_(3)PO_(4)-assisted photogenerated holes activation for benzyl radical generation,photoinduced CO_(2)reduction,as well as solvent-assisted chemoselective carboxylation.Various characterizations and density functional theory(DFT)results revealed that Z-scheme CdS@g-C_(3)N_(4)not just significantly enhanced separation of charges and accumulation of photoinduced electrons on g-C_(3)N_(4)but also facilitated adsorption along with activation of CO_(2).This research provided novel heterogeneous photocatalytic approach to produce carbon chains increased carboxylic acids via sp^(3)C-H activation and CO_(2)carboxylation.
基金financially supported by Natural Science Foundation Project of CQ (No.CSTB2023NSCQ-LZX0067)Science and Technology Research Program of Chongqing Municipal Education Commission (No.KJZD-K202200804)+2 种基金Venture & Innovation Support Program for Chongqing Overseas Returnees (No.cx2020113)National Natural Science Foundation of China (No.21201184)Chongqing Technology and Business University Graduate Innovative Research Project (No.CYS240548)。
文摘To implement the principle of utilizing waste to address waste issues,porous carbon catalytic materials,prepared through a straightforward process involving NaOH-assisted microwave pyrolysis of ubiquitous waste plastics,were employed to degrade pollutants via peroxymonosulfate(PMS) activation.Polyethylene terephthalate(PET) derived P_(1)S_(2) exhibited characteristics of defects enrichment and C=O formation,while H_(1)S_(2),prepared by carbonization of high-density polyethylene(HDPE),possessed a large number of C-OH and defects.Metal-free catalysts P_(1)S_(2) and H_i S_(2) exhibited excellent tetracycline(TC) degradation performance,with the rate constants up to 0.303 min^(-1) and 0.235 min^(-1).Interestingly,mechanism studies demonstrated that the types of waste plastic precursor had a significant impact on the pathways involved in TC degradation.Specifically,carbon defects in p_(1)S_(2) dominated the electron transfer nonradial degradation pathway of TC;However,C-OH in H_(1)S_(2) served as the reactive site for main active species SO_(4)^(·-)/^(·)OH generation,initiating a free radical pathway.In addition,by combining Fukui function calculation and LC-MS test during the TC degradation process,the vulnerable sites attacked by active species were identified;different degradation routes of TC in nonradial and radial pathways were proposed and discussed.Furthermore,the toxicity of all intermediates was analyzed using the toxicity assessment software.This study offers fresh insights into the critical role of carbocatalysts derived from various waste plastics in both nonradical and radical activation processes of PMS.
基金supported by the Priority Research Project of Xiamen(No.3502Z20191015)。
文摘All-inorganic cesium lead halide perovskite nanocrystals(CsPbX_(3),X=Cl,Br,I)have attracted considerable scientific and technological interest due to their precise bandgap tunability,high color purity and efficient luminescence.Nevertheless,their poor stability in harsh conditions such as moisture,ultraviolet(UV)light irradiation and high temperature,is a major obstacle for their further commercial applications.Herein,by simply using a new type of precursor,namely“HPbX_(3)”(X=Cl,Br,I),we can achieve the coordination equilibrium for Pb precursors during reaction and obtain high-quality perovskite nanocrystals with tremendously enhanced luminous efficiency and chemical stability based on hot-injection method.The prepared a-CsPbb nanocrystals exhibit an extremely high photoluminescence quantum yield of 96%and keep stable in air for more than two months without any post-synthesis treatment.Moreover,stability evaluations under UV light irradiation,water or thermal impact are also performed and the results show substantially improved stability of these nanocrystals as compared with the samples prepared using traditional Pbl_(2) as precursor.Through temperature-dependent(10-300 K)steady and transient spectral analysis combined with compositional measurements,it is revealed that the lower structural defect density,which is guaranteed by abundant halogen when using HPbX3 as precursor,is the most important reason for such performance enhancement.
文摘For more than three decades, the quest for superconductivity in nickel oxides, also known as nickelates, has symbolized the unwavering dedication in search for an analogy to the Nobe Prize-winning high-temperature superconducting copper oxides, or cuprates [1].
基金supported by the National Natural Science Foundation of China(Grant No.32160532 and 31860446).
文摘Lactobacillus acidophilus GIM1.208(LA)can greatly improve the volatile flavor and sensory scores of Rosa roxburghii Tratt(RRT),while its effects on nonvolatile flavor and active compounds remains uncertain.Therefore,this study used widely targeted metabolomics to comprehensively analyze the effects of LA on flavor and activity of RRT.After being fermented by LA,the total phenolics and flavonoids content of RRT increased,while the total triterpenoids content slightly decreased.The total antioxidant activity rose by 35.23%,and hypoglycemic activity expressed through α-amylase and α-glucosidase inhibitory activities increased by 51.66% and 24.95%,respectively.A total of 1635 metabolites were identified,including amino acids,phenolic acids,flavonoids,and triterpenes,and 205 different metabolites were screened.The analysis of potential taste-related metabolites among differential metabolites revealed a reduction in amino acid content,while the majority of organic acids and sugars exhibited an increase.The electronic-tongue and electronic-nose showed that LA reduces bitterness and astringency while enhancing the aroma of RRT,indicating changes in flavor compounds lead to improved flavor quality.Additionally,LA can hydrolyze glycoside compounds in RRT and release glycosides with higher activity,which contributes to its increased antioxidant and hypoglycemic effects.In summary,LA induced alterations in the flavor compounds and glycosides of RRT,thereby improved its flavor and activity.This study can serve as a reference for future research on the flavor and activity of RRT,as well as for production quality control.
