题目:Enhanced catalytic degradation of ciprofloxacin with FeS2/SiO2 microspheres as heterogeneous Fenton catalyst: Kinetics, reaction pathways and mechanism

作者:Diao Zeng-Hui, Xu Xiang-Rong*, Jiang Dan, Li Gang, Liu Jin-Jun, Kong Ling-Jun, Zuo Lin-Zi

刊物:Journal of Hazardous Materials

年卷期页:2017,327: 108-115

摘要: tIn this study, the application of FeS2/SiO2microspheres as a catalyst to activate H2O2for the degra-dation of ciprofloxacin (CIP) was systematically investigated. Results demonstrated that the presenceof SiO2microspheres on the surface of FeS2could effectively make the reaction of aqueous Fe2+andH2O2smoothly continuous by controlling the release of aqueous Fe2+from FeS2. Nearly 100% of CIPwas degraded after 60 min under the optimum conditions. A superior performance on the CIP degrada-tion and high reusability of the catalyst was obtained in FeS2/SiO2microspheres activated H2O2system.A low concentration of ethylene diamine tetraacetie acid (EDTA) did positively affect the degradationrate of CIP. A synergetic effect between adsorption and oxidation processes contributed to the signif-icant enhancement of CIP degradation. Seven oxidation intermediates were identified during the CIPdegradation process, and the direct HO•oxidation proved to be a main CIP degradation pathway. Fordegradation pathway of CIP, oxidation of piperazine ring would be its first step, followed by cleavage of the∗heterocyclic ring. Subsequently, the substitution, hydroxylation and decarboxylation processes occurred.This is the first report on the feasibility of FeS2/SiO2microspheres activated H2O2system for the enhanceddegradation of CIP.