Mediated electron transfer process in α-MnO_(2)catalyzed Fenton-like reaction for oxytetracycline degradation  

作　　者：Yiqian Jiang Zihan Yang Xiuru Bi Nan Yao Peiqing Zhao Xu Meng 

机构地区：[1]State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Chemical Letters》2024年第8期367-372,共6页中国化学快报（英文版）

基　　金：supported by the Youth Innovation Promotion Association,CAS(No.2018456);Major Program of Lanzhou Institute of Chemical Physics,CAS(No.ZYFZFX-10);State Key Laboratory Program of the Lanzhou Institute of Chemical Physics,CAS(No.CHGZ-202211).

摘　　要：In Fenton-like oxidation,the catalyst directly influences the reaction mechanism for the degradation of pollutants from water.Here,a α-MnO_(2)catalyst(OAm-1)was synthesized via a self-assembly method with the assistance of a surfactant.OAm-1 possessed a large specific surface area of_(2)21 m2/g,abundant mesoporous structures and a large proportion of Mn(III).Further characterization exhibited that OAm-1 had abundant oxygen vacancies and excellent reducibility and conductivity.The adsorption and catalytic ability of OAm-1 were studied in the degradation of oxytetracycline(OTC)via the activation of hydrogen peroxide(H_(2)O_(2)).Through the radical quenching experiments,electron resonance spectroscopy(EPR),X-ray photoelectron spectroscopy(XPS)and Fourier-transform infrared spectroscopy(FT-IR)analysis,Mn(III)of OAm-1 was proved to be the active sites for the chemisorption of OTC.Systematic electrochemical ex-periments and analysis have shown that a process of electron transfer mediated by OAm-1 occurred be-tween the pollutant and H_(2)O_(2)during a Fenton-like reaction.This work experimentally verifies the elec-tron transfer process dominated nonradical mechanism overα-MnO_(2),which is helpful for understanding the catalytic mechanism of the Fenton-like oxidation.

关 键 词：Mediated electron transfer Hydrogen peroxide Oxidative degradation Manganese oxide Fenton oxidation 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]