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/Bi2WO6-MoS2 heterojunction was synthesized. In thus a system, Au nanoparticles are tightly attached to the sides of Bi2WO6 nanosheets, conducting a HEI effect with additional visible light response to inject hot electrons into Bi2WO6, resulting in additional charge generation. Meanwhile, few-layer MoS2 nanosheets were chemically assembled onto ultrathin Bi2WO6 nanosheets via interfacial S-O bonds to form a intimate 2D-2D nanojunction, the separated and injected electrons-on the surface of Bi2WO6 were further directional transfer to MoS2 nanosheets through S-O bonds for detoxification of heavy metal ions Cr(VI), and the corresponding holes left on Bi2WO6 nanosheets were applied for simultaneous degradation of tetracycline antibiotic. The photocatalytic detoxification activity of Au/Bi2WO6-MoS2 was nearly 4.84, 3.47 and 1.90 times higher than that of pristine Bi2WO6, Au/Bi2WO6 and Bi2WO6-MoS2 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.