银基光催化剂W-Ag3PO4的制备及其可见光降解抗生素左氧氟沙星

庞族族; 丁宁; 刘宏

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (9) : 4606-4615.

水污染与控制

银基光催化剂W-Ag₃PO₄的制备及其可见光降解抗生素左氧氟沙星

庞族族¹, 丁宁², 刘宏¹

作者信息 +

Preparation of silver-based photocatalyst W-Ag₃PO₄ and its visible light degradation of antibiotic levofloxacin

PANG Zu-zu¹, DING Ning², LIU Hong¹

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摘要

采用简易化学沉淀法成功合成了不同钨掺杂比的磷酸银,并研究其对左氧氟沙星的降解效果.利用X-射线衍射、傅里叶红外光谱、扫描电子显微镜、X-射线能谱和紫外可见漫反射光谱对光催化材料的形态、结构和光学性质进行表征,结果显示W⁶⁺进入了磷酸银晶格,占据了P⁵⁺的位置,提升了材料的结晶度.钨掺杂磷酸银后,其粒径的减小、结晶度的增强及光吸收范围的增大,进一步促进了光生电子-空穴对的分离;光催化降解实验结果表明,在pH值为5时,钨含量为0.5%的W-Ag₃PO₄在光照90min后对左氧氟沙星的降解率可达到89%;通过进一步分析降解机理,发现h⁺是光催化过程中主要的氧化物种,而·OH和·O₂^-只是发挥从属作用.在可见光照射下,与单纯的Ag₃PO₄相比,改性后W-Ag₃PO₄对左氧氟沙星展现出了更优越的催化效果.本研究制备的改性银基光催化剂增强了磷酸银的抗光腐蚀性,提高了其稳定性,为高效降解左氧氟沙星提供了新途径.

Abstract

Silver phosphates with different tungsten doping ratios were successfully synthesized by a facile chemical precipitation method, and their degradation effects on levofloxacin were investigated. The morphology, structure and optical properties of the photocatalytic materials were characterized by X-ray diffraction, Fourier infrared spectroscopy, scanning electron microscopy, X-ray energy spectroscopy and UV-vis diffuse reflectance spectroscopy. W⁶⁺ enters the silver phosphate lattice, occupies the position of P⁵⁺ and enhances the crystallinity of the material. The particle size of tungsten-doped silver phosphate was reduced, the crystallinity was enhanced, and the light absorption range was increased, which further promoted the separation of photogenerated electron-hole pairs. The results of photocatalytic degradation experiments showed that W-Ag₃PO₄ with 0.5% tungsten content degraded levofloxacin by up to 89% after 90min of light exposure at pH 5. Further analysis of the degradation mechanism revealed that h⁺ was the major oxide in the photocatalytic process, while ·OH and ·O₂^- played only a subordinate role. Under visible light irradiation, the modified W-Ag₃PO₄ exhibited higher catalytic effect on levofloxacin compared with Ag₃PO₄ alone. The modified silver-based photocatalyst prepared in this study enhanced the photocorrosion resistance of silver phosphate and improved its stability, providing a new route for the efficient degradation of levofloxacin.

导出引用

庞族族, 丁宁, 刘宏. 银基光催化剂W-Ag₃PO₄的制备及其可见光降解抗生素左氧氟沙星[J]. 中国环境科学. 2023, 43(9): 4606-4615

PANG Zu-zu, DING Ning, LIU Hong. Preparation of silver-based photocatalyst W-Ag₃PO₄ and its visible light degradation of antibiotic levofloxacin[J]. China Environmental Science. 2023, 43(9): 4606-4615

中图分类号： X703.1

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