Efficient degradation of phenol with high salinity wastewater by catalytic persulfate activation using chitosan biochar

Key Words:HETEROSTRUCTURE; REDUCTION; CARBON

Abstract:It is still a big challenge to realize the bottom-up design and fabrication of high-efficient photocatalyst. Herein, MoSe2-WSe2@Sv-ZnIn2S4 (MoSe2-WSe2@Sv-ZIS) Z-scheme photocatalyst with chemical bond bridged wedgetype heterointerface is designed and synthesized based on a bottom-up strategy from band matching and surface modulating to wedge-type heterointerface constructing. Experimental and characterizations results reveal the basic principle for the enhanced photocatalytic activity, in which the internal electric field provides charge transfer driving force, the chemical bond connected wedge-type heterointerface with ample atomic-level charge transfer channels promotes interfacial photocarriers transfer, and the S-vacancies accelerates photocarriers separation. As a result, MoSe2-WSe2@Sv-ZIS achieves a H2 evolution rate of 120.74 mmol center dot g- 1 center dot h-1 (with sacrificial agent) and 2.27 mmol center dot g- 1 center dot h-1 (without sacrificial agent), an apparent quantum efficiency of 16.3% at 420 nm, and nearly 90% of H2 production retention after 10 times successive uses. This work donates a design model on fabricating high-performance photocatalyst with chemical bond bridged allotypic heterointerface.

Volume:445

Issue:

Translation or Not:no