Modified Of Bi-based Photocatalysts And Their Photocatalytic Activities Study

In this paper, a series of Bi-based photocatalysts after modification have been developed. The as-prepared samples were characterized by XRD, EDS, TEM, UV-vis, BET et al. In addition, a possible mechanism on basis of theoretical and the experimental results was discussed.BiOCl doped with different chlorine contents were successfully prepared via a solvothermal process. The photocatalytic performances of the samples were investigated by the decomposition of RhB aqueous solution under visible-light irradiation. The Zn-doped BiOCl with Rzn/Bi= 0.07 showed the highest photocatalytic activities of almost all RhB was decomposed in 8 min, the result shown that its photocatalytic activity is better than other BiOCl-based photocatalyst reported in literatures. Moreover, repetitive tests implying the good recyclability and stability of the catalytic.Ba-doped Bi2WCO6 have been successfully synthesized by a hydrothermal route. The photocatalytic properties were evaluated by the degradation of RhB in aqueous solution, and the Ba doped Bi2WO6 with atomic ratio of Ba/Bi of 0.15 had the highest Photocatalytic activities, the degradation rate is about 2 times greater than pure Bi2WO6. The information provided here is expected to provide some insight into the design of new highly active photocatalyst about alkaline-earth metals.Cadmium doped Bi2WO6 nanocomposites with different Cd contents have been successfully synthesized by a one-step route using ethylene glycol(EG) and water as solvents. The photocatalytic activity of Bi2WO6 significantly improved after the doping of Cadmium, almost all RhB was decomposed in 40 min. Moreover, the Cd-Bi2WO6 photocatalyst remained stable even after five consecutive cycles.A facile deposition method has been used to produce the p-n junction BiOBr/ZnWO4 photocatalysts. The as-prepared nano-BiOBr/ZnWO4 heterostructures exhibited higher photocatalytic performance on the degradation of RhB than that of BiOBr and ZnW04 under visible light irradiation. The analysis of photocatalytic mechanism revealed that the enhanced photocatalytic activities are attributed to the formation of nano-BiOBr/ZnWO4 heterojunction interface which could efficiently facilitates the separation of electron-hole pairs. Moreover, the result confirm that BiOBr could be a better photosensitizer for n-type semiconductors to increase the visible light absorption.A novel heterojunction BiOI/Bi2MoO6 photocatalyst was successfully prepared via a facile deposition method. The BiOI/Bi2MoO6 photocatalysts exhibited much higher visible light induced photocatalytic activities. The enhanced photocatalytic activities could be mainly resulted from the novel p-n heterojunction interface between B12MoO6 and BiOI, which could separate photoinduced carriers efficiently and enhance absorption in the visible light region. Moreover, the result confirm that BiOI could be a better photosensitizer for Bi2MoO6.