银基光催化剂W-Ag<sub>3</sub>PO<sub>4</sub>的制备及其可见光降解抗生素左氧氟沙星

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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.

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	庞族族
	丁宁
	刘宏

关键词 ：半导体材料, 可见光, 光催化, 抗生素, 左氧氟沙星降解

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.

Key words： semiconductor visible light photocatalysis antibiotic levofloxacin degradation

收稿日期: 2023-02-13

PACS:

X703.1

基金资助:国家自然科学基金青年基金(51708381)；江苏省自然科学基金项目面上项目(BK20181466)；江苏省苏州市科技局民生科技项目(SS2019028)；苏州市生态环保局环保项目(B201903)

通讯作者: 刘宏,副教授,hong.liu@usts.edu.cn E-mail: hong.liu@usts.edu.cn

作者简介: 庞族族(1995-),男,安徽宿州人,苏州科技大学硕士研究生,主要从事废水处理与资源化利用方面的研究.发表论文1篇.18896712601@139.com

引用本文:

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. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4606-4615.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I9/4606

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