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Novel synthesis of sulfur-doped Ag3PO4 photocatalyst for efficient degradation of cylindrospermopsin
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.cej.2024.158462 Xu Zhang, Li Zhou, Yiyang Liu, E Hengchao, Zhiyong Zhao, Huaqiang Chu, Xuefei Zhou, Yalei Zhang, Guoyan Zou
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.cej.2024.158462 Xu Zhang, Li Zhou, Yiyang Liu, E Hengchao, Zhiyong Zhao, Huaqiang Chu, Xuefei Zhou, Yalei Zhang, Guoyan Zou
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 °C in air optimized the photocatalytic 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 S6+ by replacing P5+ 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.
更新日期：2024-12-21
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