Nanosheet assembled spheres Ni-MoS2 and Bi2WO6 constitute heterogeneous structures for effective degradation of ultra-high concentration organic pollutants and first-principles analysis

Abstract

In this study, the Ni-doped MoS2 photocatalyst was first prepared by hydrothermal method, and then combined with Bi2WO6 to form Bi2WO6/Ni-MoS2 heterogeneous composite material. Bi2WO6/Ni-MoS2 composites have higher optical absorption intensity and photogenic carrier mobility. The 4% Bi2WO6/Ni-MoS2 composite had the best photocatalytic degradation efficiency in the photocatalytic degradation experiment of rhodamine B at high concentration. The first - principles analysis shows that the heterogeneous structure can promote charge transfer. The experimental results showed that ·OH, O2−· and h+ all acted in the reaction, and h+ played the main role. On the basis of systematic study, the mechanism of Ni-doped MoS2 and the construction of heterojunction structure to enhance the photocatalytic activity is elucidated, which provides a new reference for the design of novel efficient photocatalysts.