Solid-heterostructural BiOBr_(0.5)I_(0.5)/Bi_5O_7Br_(0.5)I_(0.5) with oxygen vacancies for efficient photocatalytic organic pollutants degradation

摘要

Carrier and exciton photocatalysis processes all occurred with bismuth oxyhalide photocatalysts according to previous researches, and the photocatalytic properties can be improved through optimizing any of these two processes. Herein, solid-heterostructural BiOBr0.5I0.5/Bi5O7Br0.5I0.5 with oxygen vacancies is synthesized and applied for environmental remediation, especially for some organic pollutants degradation. The improved photocatalytic organic pollutants degradation efficiency of BiOBr0.5I0.5/Bi5O7Br0.5I0.5 is due to the synergistic effect of both enhanced exciton and carrier photocatalysis due to the unique structure, which has been explored and explained by efficient characterizations. This work demonstrates a modified method for bismuth oxyhalide photocatalysts and provides a new thought for environmental remediation in a sustainable method.