期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 10, 期 21, 页码 7365-7377出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cy01539c
关键词
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资金
- National Natural Science Foundation of China [21667004]
- Guangxi Science Foundation Funded Project [2018GXNSFAA281343, 2018GXNSFAA138039]
In this work, the catalytic activity of an Fe2O3/Zn-Al layered double hydroxide (F/ZA-LDH) in the photo-Fenton reaction has been studied in detail. The F/ZA-LDH composite exhibited significantly enhanced catalytic activity in a photo-Fenton system. The apparent rate constant of F/ZA-LDH in the photo-Fenton reaction was about 4 times higher than that of the pure Zn-Al LDH, and was about 10 times higher than that of the red mud, which was the main material for synthesized F/ZA-LDH. It was found that besides the increased surface area (45.64 m(3) g(-1)) and enhanced pore volume of the F/ZA-LDH composite, the suitable concentration of oxygen vacancies could account for the significantly enhanced catalytic activity of F/ZA-LDH. The oxygen vacancies favor the visible light absorption and the efficient charge separation and transfer of F/ZA-LDH. Moreover, density functional theory (DFT) calculations were used to explore the electronic structures of the as-prepared samples, and the photocatalytic activity of F/ZA-LDH was also analyzed based on the results of electronic structures. The F/ZA-LDH composite exhibited excellent settleability, good reusability and stability in use. Finally, the possible mechanisms involved in the photo-Fenton system catalyzed by F/ZA-LDH have been proposed. This work would provide a systematic understanding of the high catalytic activity of the Fe2O3/Zn-Al layered double hydroxide which has been prepared using bulk waste red mud as the main material via mechanochemical synthesis.
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