Novel synthesis of sulfur-doped Ag3PO4 photocatalyst for efficient degradation of cylindrospermopsin

文献类型： 外文期刊

第一作者： Zhang, Xu

作者： Zhang, Xu;Zhou, Li;Zou, Guoyan;Zhang, Xu;Chu, Huaqiang;Zhou, Xuefei;Zhang, Yalei;Liu, Yiyang;Hengchao, E.;Zhao, Zhiyong;Zhang, Xu

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关键词： Cylindrospermopsin; S-doped Ag3PO4; Calcination; Degradation mechanisms; Toxicity

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 504 卷

页码：

收录情况： SCI

摘要： This study introduces a novel synthesis of sulfur (S)-doped Ag3PO4 photocatalyst using a simple precipitation method facilitated by ammonium sulfate ((NH4)2SO4). The calcination at 200 degrees C in air optimized the photo- catalytic performance, leading to the complete degradation of cylindrospermopsin (CYN) within only 5 min under visible light irradiation. The degradation rate constant for the calcined S-doped Ag3PO4 (A-200) is 1.77 times higher than the pristine sample (A). The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed that air calcination, facilitated by thermal treatments and charge compensation, enhanced the incorporation of S 6+ by replacing P 5+ in the lattice of Ag3PO4 and the production of silver vacancies. These changes resulted in a reduced band gap and more efficient separation of photogenerated electron-hole pairs. Photogenerated holes (h+) and singlet oxygen (1O2) were identified as the main oxidizing agents responsible for the detoxification of CYN. Moreover, the degradation mechanism analysis indicated that the cleavage of hydroxymethyl uracil, tricyclic alkaloids, and sulfate groups in CYN is crucial for its degradation and detoxification.

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