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 assista...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.展开更多
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).
文摘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.
