화학공학소재연구정보센터
Applied Catalysis B: Environmental, Vol.199, 87-95, 2016
Three dimensional Z-scheme (BiO)(2)CO3/MoS2 with enhanced visible light photocatalytic NO removal
The Z-scheme photocatalyst systems, with the redox ability of photogenerated electrons and holes unchanged and the efficient separate of carriers, have been under extensive investigation. Herein, we developed a facile method to prepare three dimensional Z-scheme (BiO)(2)CO3/MoS2 photocatalysts. Due to the enhanced visible light absorption, fast electrons and holes separate and transfer, the resulting three dimensional (BiO)(2)CO3/MoS2 photocatalysts exhibited high visible photocatalytic activity in the removal of NO in air, which exceeded those of the pristine (BiO)(2)CO3 and MoS2. Electron spin resonance trapping results indicated that h(+) and center dot O-2(-) were the main reactive species for NO removal. Although (BiO)(2)CO3 is a n-type semiconductor while MoS2 is a p-type semiconductor, a unique Z-scheme electron/hole transport mechanism instead of the p-n junction mechanism was proposed for the interfacial interaction between MoS2 and (BiO)(2)CO3 under visible light irradiation. The present work reveals a unique 3D Z-scheme photocatalyst system with p- and n-type semiconductors, and opens up new opportunities in designing hybrid photocatalysts with enhanced,photocatalytic properties. (C) 2016 Elsevier B.V. All rights reserved.