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Insight into the enhanced catalytic activity of a red mud based Fe2O3/Zn–Al layered double hydroxide in the photo-Fenton reaction

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Abstract

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 m3 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.

Graphical abstract: Insight into the enhanced catalytic activity of a red mud based Fe2O3/Zn–Al layered double hydroxide in the photo-Fenton reaction

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Article information


Submitted
31 Jul 2020
Accepted
02 Sep 2020
First published
02 Sep 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Insight into the enhanced catalytic activity of a red mud based Fe2O3/Zn–Al layered double hydroxide in the photo-Fenton reaction

Q. Li, G. Wei, Y. Yang, Z. Li, L. Zhang, L. Shao and S. Lai, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY01539C

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