Constructing Wo 3 /Tio 2  Heterojunction with Solvothermal-Sintering for Enhanced Photocatalytic Activity Under Visible Light Irradiation

Abstract

Developing high-efficiency and low-cost photocatalysis are of important significance for large-scale organic waste disposal technologies. Here, a versatile and simple solvothermal-sintering route is proposed to construct WO 3 /TiO 2  heterojunction for catalytic oxidation of origin dyes under visible light irradiation. Tightly bonded bimetal centers and well-designed heterojunction lead to significantly reduced band gap of the photocatalysis. Furthermore, significantly enhanced photocatalytic activity are achieved for degrading various organic dyes under visible light. In particular, the degradation rate of RhB with the heterojunction reaches 95.31% under visible light for 80 minutes, which is considerably higher than that of 34.81% with TiO 2 . Besides, WO 3 /TiO 2  heterojunction still maintains excellent photocatalytic activity after three cycles of degradation. This work proposes a simple, low-cost but effective route to fabricate WO 3 /TiO 2  heterojunction, which can be used for large-scale organic wastewater disposals across industrial circles.

Keywords: Heterojunction, Solvothermal-Sintering, Photocatalysis