Synergistic Photocatalysis-Catalytic Peroxidation of BiOBr/H2O2 System for 4-Chlorophenol Degradation

摘要

The synergistic BiOBr/H2O2 system was developed to improve the visible-light photo-degradation activity of 4-chlorophenol (4-CP). It was demonstrated that the BiOBr catalyst could decompose H2O2 molecular efficiently under visible light irradiations. Based on the trapping test, the main active species of;;O_2~- radicals in BiOBr/H2O2 system accelerated the efficient decomposition of H2O2 to form the;;OH radicals, which further reacted with the 4-CP. In comparison, the photo-induced holes were the main active species during the photo-degradation of 4-CP on the single BiOBr catalyst. Furthermore, the intermediate of both benzoquinone and hydroquinone during the 4-CP photo-degradation in the BiOBr/H2O2 system, was determined by the HPLC-MS measurement, which was followed by the final decomposition to CO2. In addition, the high crystallization resulted in the stability of BiOBr in the BiOBr/H2O2 system, indicative of the potential practical application for the wastewater treatment.