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| Preparation and Performance of Ag3PO4/Ag2S/g-C3N4 Composite Photocatalyst |
| Author Name | Affiliation | E-mail | | DENG Jun-Yang | School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China | | | WANG Jie | School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China | | | ZHU Si-Long | School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China | | | NIE Long-Hui | School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China | nielonghui@mail.hbut.edu.cn |
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| Abstract: Ag3PO4/Ag2S/g-C3N4 composite photocatalysts were successfully prepared by a deposition-ion exchanged combined method. And the obtained samples were characterized by X-ray powder diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N2 adsorption and desorption isotherms, UV-visible diffuse reflectance spectroscopy, fluorescence spectrophotometry and so on. The catalytic activity and stability of the catalysts were evaluated by degradation of rhodamine B under visible light. The effect of molar ratio of sodium sulfide to silver phosphate (nNa2S/nAg3PO4) on the photocatalytic performance of the silver phosphate was studied. In addition, the photocatalytic mechanism was also investigated. The results show that, with the increase of nNa2S/nAg3PO4, the activity of the obtained composite catalytic material increased firstly and then decreased. When nNa2S/nAg3PO4 was 1.5%, the obtained ASC1.5 catalyst could completely degrade rhodamine B within 40 min under visible light irradiation, and also maintained high activity after five-cycle use. Compared with single silver phosphate, the activity and stability of Ag3PO4/Ag2S/g-C3N4 composite photocatalytic materials were significantly improved, which was mainly attributed to the increase of surface area and the presence of porous structure that enhanced separating efficiency of electron-hole pairs. The study of photocatalytic mechanism over the composite catalyst have shown that h+, ·O2- and ·OH were the main active species in the photocatalytic process. The order of the role of the above three species was:h+ > ·O2- > ·OH. |
| Keywords: Ag3PO4 g-C3N4 Ag2S composite catalyst photocatalysis visible light |
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| DENG Jun-Yang,WANG Jie,ZHU Si-Long,NIE Long-Hui.Preparation and Performance of Ag3PO4/Ag2S/g-C3N4 Composite Photocatalyst[J].Chinese Journal of Inorganic Chemistry,2019,35(6):955-964. |
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