摘要
CuWO4,as an n-type oxide semiconductor with a bandgap of 2.2 eV,has stimulated enormous interest as a potential broad-spectrum-active photocatalyst for environmental pollution remediations.However,rapid charge recombination greatly hinders its practical applications.Herein,we present a cascaded electron transition pathway in a ternary heterostructure consisting of CdS quantum dots,carbon dots(CDs)and CuWO4 hollow spheres,which proves to greatly facilitate the photogenerated electron-hole separation,and eventually boosts the degradation efficiency of phenol and congo red by 100%and 46%compared to bare CuWO4.The enhanced performance of the CuWO4/CdS/CDs heterostructure mainly originates from the unidirectional electron migration from CdS to CuWO4 and then to the organics through CDs.This work elucidates the electron transfer kinetics in multi-phase system and provides a new design paradigm for optimizing the properties of CuWO4 based photocatalysts.
基金
supported by the National Natural Science Foundation of China(No.21875048)
Guangdong Natural ScienceFoundation(No.2017A030313255)
Major Scientific Project of Guangdong University(No.2017KZDXM059)
Yangcheng Scholars Research Project of Guangzhou(No.201831820)
Science and Technology Research Project of Guangzhou(No.201804010047)
Guangzhou University’s 2017 Training Program for Young TopNotch Personnel(No.BJ201704)。
