Efficient activation of sulfite for reductive-oxidative degradation of chloramphenicol by carbon-supported cobalt ferrite catalysts  

作　　者：Yongjie Li Mingjie Huang Wen-Da Oh Xiaohui Wu Tao Zhou 

机构地区：[1]School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Chemical Sciences,Universiti Sains Malaysia,Penang 11800,Malaysia

出　　处：《Chinese Chemical Letters》2023年第10期106-110,共5页中国化学快报（英文版）

基　　金：financially-supported by the National Natural Science Foundation of China(Nos.21677055,22006045 and 21407052);the National Key Technical Research and Development Program of China(No.2019YFC1805204);Leading Plan for Scientific and Technological Innovation of High-tech Industries of Hunan Province(No.2021GK4060);the Fundamental Research Funds for the Central Universities,HUST(No.2017KFXKJC004).

摘　　要：Activation of(bi)sulfite(S(IV))by metal oxides is strongly limited by low electrons utilization.In this study,two carbon-supported cobalt ferrites spinels(CoFe^(2)O_(4) QDs-GO and CoFe^(2)O_(4) MOFs-CNTs)have been successfully synthesized by one-step solvothermal method.It was found that both catalysts could efficiently activate S(IV),with rapid reductive dechlorination and then oxidative degradation of a recalcitrant antibiotic chloramphenicol(CAP).Characterizations revealed that CoFe^(2)O_(4) spinels were tightly coated on the carbon bases(GO and CNTs),with effectiveness of the internal transfer of electrons.O_(2)˙−was identified for the reductive dechlorination of CAP,with simultaneously detection of both•OH and SO_(4)^(˙−)responsible for further oxidative degradation.The sulfur oxygen radical conversion reactions and molecular oxygen activation would occur together upon the carbon-based spinels.Spatial-separated interfacial reductive-oxidation of CAP would occur with dechlorination of CAP by O_(2)^(˙−)on the carbon bases,and oxidative degradation of intermediates by SO_(4)^(˙−/•)OH upon the CoFe^(2)O_(4) catalysts.

关 键 词：Cobalt ferrite spinel Sulfite activation Reductive dechlorination Carbon supports Sulfur oxygen radical reactions 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]