Selective Oxidation of 5-Hydroxymethyl Furfural Coupled with H 2 Production over Surface Sulfur Vacancy-Rich Zn 3 In 2 S 6 /Bi 2 MoO 6 Heterojunction Photocatalyst.

The construction of heterojunctions and surface defects is a promising strategy for enhancing photocatalytic activity. A surface sulfur vacancy (VS )-rich Zn3 In2 S6 /Bi2 MoO6 heterojunction photocatalyst (ZIS-VS /BMO) was herein developed for the selective oxidation of biomass-derived 5-hydroxymethyl furfural (HMF) to value-added 2,5-diformylfuran (DFF) coupled with H2 production. The ZIS-VS /BMO heterojunction consisted of Bi2 MoO6 (BMO) with preferentially exposed high-index (131) facets and VS -rich two-dimensional (2D) Zn3 In2 S6 (ZIS-VS ) nanosheets with preferentially exposed high-index (102) facets. The directional transfer of light-driven electrons from BMO to ZIS-VS occurs in the heterojunction interface, as confirmed by an in situ irradiated XPS (ISI-XPS) measurement, which facilitates the electron-hole separation. The benefits of VS in activating HMF, suppressing overoxidation of DFF, and accelerating electron transport were disclosed by molecular simulation. ZIS-VS /BMO displays outstanding performance with a DFF yield of 74.1% and a DFF selectivity of 90%, as well as a rapid rate of H2 evolution. This research would help design highly efficient photocatalysts and develop a new technology for biomass resource utilization.