Photocatalytic Activity Of Ag@Agbr/Ag2co3 Heterojunction Synthesized By In Situ Reduction

The poor stability of the silver-based semiconductor photocatalyst is an insurmountable problem. Coupling different proportions of AgBr and Ag2CO3 together by in situ reduction method produced a series of novel AgBr/Ag2CO3 composite photocatalysts, and was accompanied by the generation of Ag@AgBr/Ag2CO3 heterojunction. The effects of different ratios of AgBr and Ag2CO3 on the photocatalytic degradation of rhodamine B under visible light irradiation were studied by XRD, UV-Vis DRS, SEM, HRTEM, TEM and XPS characterization techniques. The best ratio and UV irradiation time were explored. In addition, the photocatalytic mechanism of the photocatalyst was described. The Ag NPs formed on the surface of AgBr/Ag2CO3 may be one of the reasons for effectively improving the separation efficiency of electron-hole pairs (e--h+), accelerating dye degradation and improving photocatalytic stability.The Ag@AgBr/Ag2CO3 heterojunction was prepared by in situ reduction method. RhB was used as the simulated pollutant, and the degradation rate of RhB was as high as 96.7% within 10 min under simulated light conditions. After five cycle tests, the degradation rate of RhB was 98.12%. The Ag NPs produced by the in situ reduction method act as the center of charge separation to accelerate the separation of photogenerated electron-hole pairs; the SPR effect produced by Ag reduces the photocorrosion of the photocatalyst. The two effects synergistically accelerate the degradation of pollutants. The photocatalyst has good photocatalytic performance and stability, and has a broad application prospect.