Effect of Reducing Agent NaBH4 on Photocatalytic Properties of Bi/BiOBr/Bi2WO6 Composites

With the improvement of human living standards, a large amount of drugs in the fields of medicine, agriculture, animal husbandry and other fields have being invested and used, resulting in an increasing demand for cleaning antibiotics to clean water sources. In this study, Bi/BiOBr/Bi2WO6 composite photocatalyst was successfully synthesized by ahydrothermal method with BiOBr as the precursor. The effect of reducing agent sodium borohydride (NaBH4) on the structure and photocatalytic activity of the composite was studied. The results showed that most active photocatalyst was obtained when 20 mmol/L of sodium borohydride was used. The degradation of norfloxacin on Bi/BiOBr/Bi2WO6 reached 96.1%, which was about 6.7% higher than that on BiOBr/Bi2WO6. And the reaction rate was 1.4 times of BiOBr/Bi2WO6. The heterojunction formed by the three substances was the main reason for the enhanced catalytic activity. These results were beneficial for the practical application of high performance Bi/BiOBr/Bi2WO6 photocatalytic materials.