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Mu, Feihu; Huang, Jin; Xu, Shengpan; Wang, Ruiqing; Chu, Xiaozhong; Cheng, Zhipeng; Guo, Xujing; Zhao, Wei; Dai, Benlin; Zhu, Wenshuai
Colloids and surfaces. A, Physicochemical and engineering aspects, 09/2024, Volume: 696Journal Article
Dissolved organic matter (DOM) in black-odorous water can cause excessive growth of plants and algae, leading to deterioration of water quality. Herein, an S-scheme Au/g-C3N4/BiVO4 heterojunction was constructed using a three-step method for DOM degradation in real black-odorous water in the presence of peroxymonosulfate (PMS). 4Au/g-C3N4/BiVO4/PMS exhibited highly efficient photocatalytic performance, and the DOM removal rate could reach 92.9 %, which was 19.1 and 9.9 times higher than that of g-C3N4/PMS and BiVO4/PMS, respectively. The changes of fluorescence components in DOM were detected using synchronous fluorescence spectra and two-dimensional correlated spectroscopy analysis, and the toxicity of catalytically treated black-odorous water was evaluated by growth inhibition of Escherichia coli. A reasonable S-scheme mechanism was suggested by theoretical calculations and photoelectrochemical tests. The S-scheme mechanism and the synergistic effect of photocatalysis and hybrid advanced oxidation process (HAOP) increased the catalytic activity of Au/g-C3N4/BiVO4/PMS. Display omitted •An S-scheme Au/g-C3N4/BiVO4 heterojunction was constructed.•The sample showed excellent activity for DOM degradation in the presence of PMS.•The S-scheme mechanism and the synergistic effect of photocatalysis and HAOP increased the catalytic activity.•The changes of fluorescence components in DOM were detected using SFS and 2D-COS analysis.•Theoretical calculations explored the degradation process and visible light harvesting.
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