Preparation of WO3/Bi2S3 heterojunction photocatalysts and its performance in photocatalytic degradation of tetrabromobisphenol A in water
Aims:This paper aims to study the degradation performance of tetrabromobisphenol A(TBBPA)in water by WO3/Bi2S3 heterojunction photocatalysts under low light intensity.Methods:A series of WO3/Bi2S3 heterojunction photocatalysts with different molar ratios were prepared using the solvothermal method.The synthesized materials were characterized by SEM,TEM,XRD,XPS,etc.The degradation efficiency of WO3/Bi2S3 for TBBPA was studied by photocatalytic experiments under low light intensity.The degradation mechanisms of TBBPA by the WO3/Bi2S3 photocatalytic system were analyzed by radical quenching experiment and electron spin spectroscopy.Results:The WO3/Bi2S3 heterojunction with a molar ratio of 1∶6 had the best degradation efficiency at a dosage of 60 mg and pH of 8 under 100 W light intensity;and the degradation rate of 5.4 mg/L TBBPA was about 76.3％in 150 min.In addition,the degradation of TBBPA was mainly achieved through hole oxidation.Conclusions:The prepared WO3/Bi2S3 heterojunction photocatalyst can effectively degrade the TBBPA in the aqueous environment.
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