Effective charge kinetics steering in surface plasmons coupled two-dimensional chemical Au/Bi2WO6-MoS2 heterojunction for superior photocatalytic detoxification performance

Developing and designing a rational heterojunction with efficient charge kinetics properties have been a research hotspot for improving photocatalytic performance. Herein, a surface plasmons coupled two-dimensional chemical Au/Bi 2 WO 6 -MoS 2 heterojunction was synthesized. In thus a system, Au nanoparticles are tightly attached to the sides of Bi 2 WO 6 nanosheets , conducting a HEI effect with additional visible light response to inject “hot electrons” into Bi 2 WO 6 , resulting in additional charge generation. Meanwhile, few-layer MoS 2 nanosheets were chemically assembled onto ultrathin Bi 2 WO 6 nanosheets via interfacial S O bonds to form a intimate 2D-2D nanojunction, the separated and injected electrons on the surface of Bi 2 WO 6 were further directional transfer to MoS 2 nanosheets through S O bonds for detoxification of heavy metal ions Cr(VI), and the corresponding holes left on Bi 2 WO 6 nanosheets were applied for simultaneous degradation of tetracycline antibiotic. The photocatalytic detoxification activity of Au/Bi 2 WO 6 -MoS 2 was nearly 4.84, 3.47 and 1.90 times higher than that of pristine Bi 2 WO 6 , Au/Bi 2 WO 6 and Bi 2 WO 6 -MoS 2 composites, which could be ascribed to the effective charge kinetics steering and well manipulation of charge flow by virtue of the rational structural and compositional features. This work provides a new perspective for the construction of high-activity detoxification photocatalysts through steering charge kinetics.