Comparative study of BiVO4 and BiVO4/Ag2O regarding their properties and photocatalytic degradation mechanism. (31st May 2022)

• Record Type: Journal Article
• Authors: Tong, Yanbin; Shen, Jimin; Zhao, Shengxin; Chen, Zhonglin; Kang, Jing; Wang, Binyuan; Sun, Liqun; Bi, Lanbo
• Is Part Of: New journal of chemistry. Volume 46:Number 24(2022)
• Page Start: 11608
• Page End: 11616
• Publication Date: 2022-05-31
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj00920j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Schematic diagram of the photocatalytic mechanism under visible light. Abstract : BiVO4, as a visible light catalyst, produces photogenerated electrons and photogenerated holes that are easy to recombine. In this paper, a BiVO4 /Ag2 O composite was prepared to promote the separation of photogenerated carriers of BiVO4 . Compared with BiVO4, the properties and photocatalytic activity of BiVO4 /Ag2 O were obviously improved. The improvement of BiVO4 /Ag2 O was reflected in the better separation of photogenerated electrons and photogenerated holes, higher UV-visible maximum absorption wavelength, and stronger ability to degrade doxycycline. The effects of Ag2 O on the crystal structure, the morphology and the binding energy of BiVO4 were analyzed by XRD, XPS and SEM, and the existence of a heterojunction in BiVO4 /Ag2 O was confirmed. The results of capture experiments showed that the photocatalytic processes of BiVO4 and BiVO4 /Ag2 O produced hydroxyl radicals (˙OH), holes (h + ) and superoxide radicals (˙O2 − ). However, the contribution of active species was different in the two systems. The degradation pathways and intermediate products of doxycycline were analyzed by UPLC-QTOF. This work proposed a new method for the preparation of BiVO4 /Ag2 O particles with remarkable photocatalytic activity, and provided a reference for the degradation of doxycycline.