期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 275, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2021.119152
关键词
BiVO4; CdS; Oxygen vacancy; Photocatalysis; Z-Scheme heterojunction
资金
- National Natural Science Foundation of China [21868034]
- International Science and Technology Cooperation Program of Shihezi University [GJHZ201601]
A cost-effective photocatalyst, Bi/BiVO4-CdS, with efficient electron-hole separation efficiency and excellent light absorption capacity, has been successfully developed for the degradation of tetracycline hydrochloride (TCH) from wastewater. This photocatalyst exhibits superior performance in TCH degradation, with a degradation ratio of 85.5% within 30 minutes and enhanced stability over multiple cycles, attributed to the generation of h(+), center dot O-2(-), and center dot OH reactive species. Intermediates identified by HPLC-MS suggest proposed pathways for the photocatalytic degradation of TCH using Bi/BiVO4-CdS.
Developing cost-effective photocatalysts with efficient electron hole separation efficiency and excellent light absorption performance for the remediation of organic pollutants from wastewater is highly desirable. Herein, a new Z-Scheme Bi/BiVO4-CdS heterojunction with leaf-like morphology has been successfully fabricated for the first time and its application as a photocatalyst for the degradation of tetracycline hydrochloride (TCH) has been explored. Compared with BiVO4 and Bi/BiVO4, the as-prepared Bi/BiVO4-CdS exhibits improved light absorption capacity and electron-hole separation efficiency, and it has a superior performance of photocatalytic degradation of TCH. The degradation ratio of TCH by Bi/BiVO4-CdS based photocatalysis reaches 85.5% within 30 min. The rate constant of TCH degradation for Bi/BiVO4-CdS is 1.32 and 1.18 times of the BiVO4 and Bi/BiVO4, respectively. In addition, Bi/BiVO4-CdS displays a high stability without obvious decay for its TCH degradation efficiency (<5%) during four recycles. The ESR characterization and reactive species trapping experiments indicates that the generated h(+), center dot O-2(-) and center dot OH from Bi/BiVO4-CdS based photocatalysis are responsible for TCH degra- dation. Since several intermediates are identified by HPLC-MS, the pathways for Bi/BiVO4-CdS based photocatalytic degradation of TCH are proposed.
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