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