Photocatalytic self-Fenton degradation of ciprofloxacin over S-scheme CuFe2O4/ZnIn2S4 heterojunction: Mechanism insight, degradation pathways and DFT calculations

文献类型： 外文期刊

第一作者： Liu, Dongdong

作者： Liu, Dongdong;Jiang, Lipeng;Chen, Dengqian;Hao, Zhengkai;Deng, Bowen;Chen, Limei;Sun, Yunyun;Liu, Huitao;Liu, Xin;Jia, Boyin

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关键词： CuFe2O4/ZnIn2S4 photocatalyst; S-scheme heterojunction; Photocatalytic self-Fenton system; CIP degradation; DFT calculations

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：15.1； 五年影响因子：14.3 ）

ISSN： 1385-8947

年卷期： 2024 年 482 卷

页码：

收录情况： SCI

摘要： The photo-Fenton process is a promising technology for wastewater purification, but the extra addition of H2O2 and the limited conversion of Fe2+/Fe3+ greatly hinder its practical application. In this study, we presented Sscheme CuFe2O4/ZnIn2S4 heterojunction photocatalytic self-Fenton system for the degradation of ciprofloxacin (CIP). The formation of an internal electric field in CuFe2O4/ZnIn2S4 heterojunction facilitated the transport and separation of photogenerated carriers, exhibiting high visible light absorption ability and photocatalytic activity. The CuFe2O4/ZnIn2S4 photocatalytic system exhibited the surprisingly high H2O2 selectivity (96.8 %) and H2O2 yield (2545.4 mu mol.g(-1)) through the 2e(-)-ORR process. DFT calculations found that the O-2 molecules were adsorbed on Cu atom of CuFe2O4/ZnIn2S4 in a "Yeager-type" configuration, which facilitated the formation of a key intermediate (*OOH) for the conversion O-2 into H2O2. The 25 mg.L-1 of CIP could be completely degraded within 60 min in CuFe2O4/ZnIn2S4 photocatalytic system, while this system also had good cyclic stability and practicality. The photogenerated electrons that accumulated on conduction band of CuFe2O4 facilitated the reduction of Fe3+ and Cu2+ to Fe2+ and Cu+, accompanying by the generation of (OH)-O-center dot, O-1(2) and O-center dot(2)-, while the photogenerated holes that accumulated on the valence band of ZnIn2S4 could directly degrade pollutants. Finally, the vulnerable atomic sites of CIP were successfully predicted by Fukui function, while the CIP degradation pathway and toxicity analysis of degradation products were further clarified. This study provided a new design route for constructing photocatalytic self-Fenton system.

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