Citation: Bo Chai, Juntao Yan, Guozhi Fan, Guangsen Song, Chunlei Wang. In situ fabrication of CdMoO₄/g-C₃N₄ composites with improved charge separation and photocatalytic activity under visible light irradiation[J]. Chinese Journal of Catalysis, ;2020, 41(1): 170-179. doi: S1872-2067(19)63383-8 shu

In situ fabrication of CdMoO₄/g-C₃N₄ composites with improved charge separation and photocatalytic activity under visible light irradiation

a Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan 430023, Hubei, China;
b School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, Hubei, China

Received Date: 26 February 2019
Revised Date: 10 April 2019

Fund Project: This work was supported by the Open Project Program of Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University (No. 201808) and Hubei Important Project of Technological Innovation (2018ABA094).

To further improve the charge separation and photocatalytic activities of g-C₃N₄ and CdMoO₄ under visible light irradiation, CdMoO₄/g-C₃N₄ composites were rationally synthesized by a facile precipitation-calcination procedure. The crystal phases, morphologies, chemical compositions, textural structures, and optical properties of the as-prepared composites were characterized by the corresponding analytical techniques. The photocatalytic activities toward degradation of rhodamine B solution were evaluated under visible light irradiation. The results revealed that integrating CdMoO₄ with g-C₃N₄ could remarkably improve the charge separation and photocatalytic activity, compared with those of pristine g-C₃N₄ and CdMoO₄. This would be because the CdMoO₄/g-C₃N₄ composites could facilitate the transfer and separation of the photoexcited electron-hole pairs, which was confirmed by electrochemical impedance spectroscopy, transient photocurrent responses, and photoluminescence measurements. Moreover, active species trapping experiments demonstrated that holes (h⁺) and superoxide radicals (·O₂^-) were the main active species during the photocatalytic reaction. A possible photocatalytic mechanism was proposed on the basis of the energy band structures determined by Mott-Schottky tests. This work would provide further insights into the rational fabrication of composites for organic contaminant removal.
- CdMoO₄/g-C₃N₄ composite,
- Heterojunction,
- Charge separation,
- Visible light,
- Photocatalytic activity
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通讯作者: 陈斌, bchen63@163.com

In situ fabrication of CdMoO₄/g-C₃N₄ composites with improved charge separation and photocatalytic activity under visible light irradiation