Highly efficient visible-light photocatalytic performance of MOFs-derived TiO2 via heterojunction construction and oxygen vacancy engineering

Novel Z-scheme ZnIn 2 S 4 /TiO 2-x photocatalyst was successfully fabricated through self-sacrificing template-chemical bath deposition combined with a NaBH 4 reduction method for the first time. It was found that ZnIn 2 S 4 /TiO 2-x exhibited high-efficient visible-light photocatalytic RhB degradation of 91 % within 40 min, which was almost 45.5, 1.2, and 6.1 times better than that of TiO 2 , ZnIn 2 S 4 /TiO 2 , and TiO 2-x , respectively. Moreover, an obscure change in catalytic activity can be observed after five recycles. The excellent photocatalytic performance can be attributed to the synergistic effect of Ov, ZnIn 2 S 4 , and MOF-derived TiO 2 , which extend the visible-light photoresponse range and promote the separation of photo-generated charge carriers.