Synthesis and Characterization of BaTiO 3 /TiO 2 Heterojunction Photocatalyst for Novel Application in Photocatalytic Degradation of TBBPA under Simulated Sunlight Irradiation

Abstract The polyacrylamide gel method combined with low temperature sintering technology (PGMCLTST) have been used to synthesize the BaTiO 3 /TiO 2 heterojunction photocatalysts. The BaTiO 3 /TiO 2 heterojunction photocatalyst only contains tetragonal BaTiO 3 , rutile TiO 2 and anatase TiO 2 , without any other impurities. Based on a variety of characterization, it was confirmed that a special heterojunction was formed between BaTiO 3 and TiO 2 , and there were a large number of interface defects or oxygen defects in the samples. The BaTiO 3 /10 wt % TiO 2 heterojunction photocatalysts have high photocatalytic activity for the degradation of tetrabromobisphenol A (TBBPA) under simulated sunlight irradiation. The interfacial defects enhance the transfer and separation efficiency of charge carriers in BaTiO 3 /TiO 2 heterojunction photocatalysts. This technique provides a new idea for the application of BaTiO 3 /TiO 2 heterojunction photocatalysts and other heterojunction photocatalysts in the degradation of persistent organic pollutants (POPs).