Enzymatic electrolysis cell(EEC)has advantages over microbial electrolysis cell(MEC)due to the needless of microbe inoculation and high-efficiency of enzymatic reaction.In this study,an EEC was first applied to achiev...Enzymatic electrolysis cell(EEC)has advantages over microbial electrolysis cell(MEC)due to the needless of microbe inoculation and high-efficiency of enzymatic reaction.In this study,an EEC was first applied to achieve the effective degradation of halogenated organic pollutants and dichloromethane(CH2Cl2)was utilized as a model pollutant.The results indicate that the degradation efficiency of CH2Cl2 after 2 hr reaction in the EEC was almost100%,which was significantly higher than that with enzyme(51.1%)or current(19.0%).The current induced the continuous regeneration of reduced glutathione(GSH),thus CH2Cl2 was degraded under the catalysis of GSH-dependent dehalogenase through stepwise dechlorination,and successively formed monochloromethane(CH3Cl)and methane(CH4).The kinetic result shows that with a current of 15 mA,the maximum specific degradation rate of CH2Cl2(3.77×10-3 hr-1)was increased by 5.7 times.The optimum condition for CH2Cl2 dechlorination was also obtained with pH,current and temperature of 7.0,15 mA and 35°C,respectively.Importantly,this study helps to understand the behavior of enzymes and the fate of halogenated organic pollutants with EEC,providing a possible treatment technology for halogenated organic pollutants.展开更多
Pollution from persistent organic chlorinated pollutants(POCPs)in water environments is attributable to historical reasons and the lack of effective discharge regulations.Electrochemical degradation of POCPs,as a key ...Pollution from persistent organic chlorinated pollutants(POCPs)in water environments is attributable to historical reasons and the lack of effective discharge regulations.Electrochemical degradation of POCPs,as a key study for POCP degradation,involves the use of electrons as reducing or oxidizing agents.The occurrence of this degradation depends on the environmental characteristics of the POCPs,the electrochemical materials used,and the technology and mechanisms involved.Furthermore,regarding the development of new materials and technologies,such as micro-,nano-,and atomic-sized materials,the degradation of POCPs achieves higher degradation efficiency and maximizes current utilization efficiency.In this review article,we first summarize the current status and future opportunities of the electrochemical degradation of POCPs.Environmental characteristics of POCPs facilitate a comparison of POCP degradation,and a comparison of electrochemical materials and their methods is made.Subsequently,we discuss technologies for the electrochemical degradation of POCPs from three aspects:oxidation,reduction,and a combination of oxidation and reduction.Moreover,the mechanisms were generalized in terms of molecular structure,electrode materials,and solution environment.In addition to maximizing the intrinsic enhancement factors of degradation,strategies to improve environmental accessibilities are equally important.This review article aims to effectively guide the advancement of POCP degradation and the remediation of environmental water pollution.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21576241 and 51678528)Hangzhou Agricultural and Social Development Research Program (No. 20180533B03)
文摘Enzymatic electrolysis cell(EEC)has advantages over microbial electrolysis cell(MEC)due to the needless of microbe inoculation and high-efficiency of enzymatic reaction.In this study,an EEC was first applied to achieve the effective degradation of halogenated organic pollutants and dichloromethane(CH2Cl2)was utilized as a model pollutant.The results indicate that the degradation efficiency of CH2Cl2 after 2 hr reaction in the EEC was almost100%,which was significantly higher than that with enzyme(51.1%)or current(19.0%).The current induced the continuous regeneration of reduced glutathione(GSH),thus CH2Cl2 was degraded under the catalysis of GSH-dependent dehalogenase through stepwise dechlorination,and successively formed monochloromethane(CH3Cl)and methane(CH4).The kinetic result shows that with a current of 15 mA,the maximum specific degradation rate of CH2Cl2(3.77×10-3 hr-1)was increased by 5.7 times.The optimum condition for CH2Cl2 dechlorination was also obtained with pH,current and temperature of 7.0,15 mA and 35°C,respectively.Importantly,this study helps to understand the behavior of enzymes and the fate of halogenated organic pollutants with EEC,providing a possible treatment technology for halogenated organic pollutants.
基金supported by the National Natural Science Foundation of China(Nos.52100116 and 21207077)the Urban Agriculture and Forestry Emerging Interdisciplinary Platform Project,the Science and Technology Innovation Support Program of Beijing University of Agriculture,the Fund of the Key Laboratory of Urban Agriculture in North China(No.KFKT-2024008).
文摘Pollution from persistent organic chlorinated pollutants(POCPs)in water environments is attributable to historical reasons and the lack of effective discharge regulations.Electrochemical degradation of POCPs,as a key study for POCP degradation,involves the use of electrons as reducing or oxidizing agents.The occurrence of this degradation depends on the environmental characteristics of the POCPs,the electrochemical materials used,and the technology and mechanisms involved.Furthermore,regarding the development of new materials and technologies,such as micro-,nano-,and atomic-sized materials,the degradation of POCPs achieves higher degradation efficiency and maximizes current utilization efficiency.In this review article,we first summarize the current status and future opportunities of the electrochemical degradation of POCPs.Environmental characteristics of POCPs facilitate a comparison of POCP degradation,and a comparison of electrochemical materials and their methods is made.Subsequently,we discuss technologies for the electrochemical degradation of POCPs from three aspects:oxidation,reduction,and a combination of oxidation and reduction.Moreover,the mechanisms were generalized in terms of molecular structure,electrode materials,and solution environment.In addition to maximizing the intrinsic enhancement factors of degradation,strategies to improve environmental accessibilities are equally important.This review article aims to effectively guide the advancement of POCP degradation and the remediation of environmental water pollution.
