In-Suit Synthesis Of A Novel Z-Scheme Sns2/Zn0.78cd0.22s Heterostructure With Excellent Photocatalytic Performance

The highly stable photocatalytic semiconductor Zn0.78Cd0.22S and SnS2 were combined to form a novel Z-scheme heterojunction successfully by using a simple and mild hydrothermal method. In this work, by combining Zn0.78Cd0.22S with SnS2, the composite Zn0.78Cd0.22S/SnS2 increased the absorption range of visible light relative to the pristine Zn0.78Cd0.22S, thus greatly improving the degradation rate of organic dyes, such as Rhodamine B. Different proportions of SnS2/Zn0.78Cd0.22S were prepared by controlling the weight of SnS2. Through transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM), it can be observed that Zn0.78Cd0.22S took hexagonal SnS2 as the carrier and gathered on SnS2. Moreover, it can be seen from the XPS, after Zn0.78Cd0.22S was combined with SnS2 to form heterojunction, the peaks of some elements were shifted, which indicated that there was some electron movement between the interface of Zn0.78Cd0.22S and SnS2. This phenomenon confirming the success of heterogeneous structure construction. It can also be observed directly from the UV-visible diffuse reflection spectrum (DRS), the SnS2/Zn0.78Cd0.22S increased its response range to visible light. Through ESR data analysis, the Z-scheme SnS2/Zn0.78Cd0.22S increased the generation rate of hydroxyl radical and superoxide radicals of this photocatalytic material, thus improving the photocatalytic performance. The photocatalytic activity of SnS2/Zn0.78Cd0.22S of different proportions was detected by the degradation degree of Rhodamine B and the photoreduction of Cr (VI). When the composite ratio was 10%, the photocatalytic performance of the material was the most outstanding. (C) 2020 Elsevier B.V. All rights reserved.