Synthesis of Bi2MoO6/BiVO4 Heterojunction and Its Efficient Visible Light Photocatalytic Activity
ZHANG Yu1, WANG Min1, ZHOU Xin2, YANG Guangjun1, CHAI Tianyu1, ZHU Tong1
1 School of Mechanical Engineering and Automation, University of Northeastern University, Shenyang 110819 2 Liaoning Wastewater Treatment and Management Center, Shenyang 110000
Abstract: Bi2MoO6/BiVO4 heterojunction photocatalysts were synthesized via a hydrothermal-calcination method. The synthesized samples were cha-racterized by XRD, SEM, EDS-Mapping, XPS and UV-vis DRS. The results indicated that the crystal structure of BiVO4 remained unchanged even though various proportions of Bi2MoO6 was added to form hetero-composite with BiVO4. While there was a certain increase in crystallinity degree, thanks to the heterojunction structure of Bi2MoO6 and BiVO4. Compared with pure BiVO4, a red-shift in the photoabsorption edge of the Bi2MoO6 /BiVO4 composite photocatalyst could be observed, resulting in a enlargement of response range of visible light, which contributed to improving the separation efficiency of electron-hole pairs and further enhancing the photocatalytic activity. Specifically, the Bi2MoO6 /BiVO4 composite photocatalyst possessed the highest photocatalytic activity when the mass ratio of Bi2MoO6 and BiVO4 was 5%. The degradation rate of methyl orange was 58%, which was 2.3 and 2.8 times of pure BiVO4 and Bi2MoO6, respectively. Besides, the recycling experiments presented that the Bi2MoO6 /BiVO4 composite photocatalyst retained excellent photo-stability after five-time recycles. The trapping experiments confirmed that the active species h+ and ·OH played an dominant role in the process of photocatalytic degradation.
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2019, Vol. 33 
