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Enhanced photocatalytic activity over a novel CuWO4/Cu1−x Zn x WO4/ZnWO4 hybrid material with sandwiched heterojunction

  • Lijing Ma (a1), Jinzhan Su (a1), Maochang Liu (a1), Longzhou Zhang (a1), Yufeng Li (a1) and Liejin Guo (a1)...

Abstract

A novel CuWO4/Cu1−x Zn x WO4/ZnWO4 hybrid photocatalyst with sandwiched heterojunction structure was prepared by a one-port synthesis with Zn doping into CuWO4. The crystalline structure, optical, and morphological properties as well as photocatalytic performance of the as-prepared hybrid photocatalyst were studied. By adjusting the amount of Zn doped, the optimal doping level was determined to be 0.1 wt% Zn2+. More than 80% photocataytic degradation of rhodamine B was achieved within 20 min over 0.1 wt% Zn2+ doped CuWO4, while only 20% was achieved for the pure CuWO4. The enhancement was proposed to be due to the formation of a CuWO4/Cu1−x Zn x WO4/ZnWO4 sandwiched heterojunction. Such tandem type heterojunction was found to be efficient for charge separation compared to traditional single heterojunction, which, in turn, resulted in a significantly enhanced photocatalytic activity. Our finding is also expected to be valuable for the exploration of CuWO4-material as a new group of efficient photocatalysts.

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Corresponding author

a) Address all correspondence to these authors. e-mail: j.su@mail.xjtu.edu.cn

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