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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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

Received: 13 February 2023

PACS:

X703.1

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	PANG Zu-zu
	DING Ning
	LIU Hong

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

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4606

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