ZHAO-Bo,XIA-Jing fen,YANG-Guo jing,et al.Preparation of Bi2MoO6/AgBr and Its Photocatalytic Activity Enhancement Mechanism[J].China Water & Wastewater,2022,38(2022 1 1):23-30.
Preparation of Bi2MoO6/AgBr and Its Photocatalytic Activity Enhancement Mechanism
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
23-30
Column:
Date of publication:
2022-01-01
- Keywords:
- photocatalysis; Z type heterojunction; Bi2MoO6; AgBr; rhodamine B
- Abstract:
- Z?type heterojunction Bi2MoO6/AgBr photocatalyst was synthesized by hydrothermal method, and its microscopic morphology, phase composition and photoelectric properties were characterized by SEM, XRD, BET, UV?Vis spectrophotometer and transient/steady fluorescence spectrophotometer. Meanwhile, the activities and degradation mechanism of the catalysts were analyzed by degradation of rhodamine B (RhB). The catalyst was composed of stacked Bi2MoO6 nanosheets in cubic phase and AgBr nanoflower clusters loaded on its surface. The formation of heterojunction increased the specific surface area by 7.2 m2/g and prolonged the lifetime of photogenerated electron pair. Photocatalytic activity of Bi2MoO6 loaded with AgBr was significantly improved. The best performance was obtained when the loaded amount of AgBr was 10%, and the rate constant of the corresponding photocatalytic reaction was 1.6 times higher than that of single Bi2MoO6 as the photocatalyst. When the RhB concentration was 0.5×10-5 mol/L, the Bi2MoO6/AgBr dosage was 250 mg/L and pH was 7, the degradation rate of RhB reached 95.9% after 20 min of reaction, and the Bi2MoO6/AgBr still had high photocatalytic activity after 5 cycles of experiments. The radical trapping experiments indicated that the main active group of Bi2MoO6 was ·O2-, and the main active groups of Bi2MoO6/AgBr were ·O2- and h+. According to the above experimental results, a Z-type charge transfer mechanism with Ag0 particles as channels was proposed.
Last Update:
2022-01-01