摘要
Regarding the utilization of semiconductor nanocrystals(NCs)in photocatalysis,the significant challenge is to eliminate the hindrance of decorated surface ligands on the photocarrier transport while maintaining their overall stability.Herein,we report a novel and stable catalyst comprising CdS NCs and surfacebound mono-(6-mercapto-6-deoxy)-β-cyclodextrin(HS-β-CD)molecules(denoted as CdS-CD),which could convert alcohols selectively into diols or aldehydes and H2 under visible light irradiation,with 100%atomutilization,using an aqueous medium as a green solvent.The decoratedβ-CD ligands did not only confer a good stability of CdS-CD in water but also showed a high host–guest affinity to the alcohol species,thereby,guaranteeing a close vicinity of alcohol molecules at the surface of CdS NCs and minimizing the hindrance of surface ligands on the photocarrier transport.As a result,the CdS-CD displayed much improved photocatalytic activity for the conversion of alcohols in aqueous media,compared with those of CdS-BF_(4)NCs.
基金
supported financially by the National Key R&D Program of China(2017YFA0700104),NSFC(21702146,21790052,and 21931007)
111 Project of China(D17003)。
