期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 419, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126543
关键词
Heterojunction; Hexavalent chromium; Metronidazole; Charge separation; Photocatalysis
资金
- National Natural Science Foundation of China [21707021]
- Natural Science Foundation of Guangxi [2017GXNSFBA198186, 2020GXNSFAA297034]
- China Postdoctoral Science Foundation [2018M633295]
- Open Fund of Guangxi Key Laboratory of Clean Pulp AMP
- Papermaking and Pollution Control [KF201723, 2019KF19]
The study developed visible-light responsive Zn3In2S6/AgBr photocatalysts for concomitant removal of MNZ and Cr (VI) with excellent removal efficiency. Experimental results indicated that it is a Z-scheme photocatalyst, facilitating the separation of photo-induced carriers.
It is urgently needed to develop high-performance materials that can synchronously remove heavy metals and organic pollutants. Herein, the visible-light responsive Zn3In2S6/AgBr composites were prepared for concurrent removals of metmnidazole (MNZ) and Cr (VI). In the Cr (VI)-MNZ coexisting system, the removals of MNZ and Cr (VI) using the optimized Zn3In2S6/AgBr-15 photocatalyst reached 98.2% and 94.8% within 2 h, respectively; higher than those using counterparts. The radical species trapping and electron spin resonance (ESR) results demonstrated that center dot OH was the most dominated species for MNZ oxidation, and photo-generated electrons were responsible for Cr (VI) reduction. Besides, slight competition for center dot O-2(-) during the simultaneous MNZ degradation and Cr (VI) reduction occurred. Energy band structure analysis, ESR and the outstanding photocatalytic performance for MNZ and Cr (VI) removals demonstrated that the Zn3In2S6/AgBr-15 was a Z-scheme photocatalyst, which promoted photo-induced carrier's separation. Possible MNZ degradation pathways and mechanism over the Z-scheme Zn3In2S6/AgBr were also proposed based on the identified intermediates. This study could inspire new ideas for design of efficient Z-scheme photocatalysts for wastewater treatment.
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