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Synthesis, Characterization, and Visible-Light Photo-Fenton Catalytic Activity of Hydroxy Fe/Al-Intercalated Montmorillonite

Published online by Cambridge University Press:  01 January 2024

Hailing Li ,
Pingxiao Wu ,
Zhi Dang ,
Nengwu Zhu ,
Ping Li  and
Jinhua Wu
Hailing Li
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China
Pingxiao Wu*
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, P.R. China The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, P.R. China
Zhi Dang
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, P.R. China The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, P.R. China
Nengwu Zhu
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, P.R. China The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, P.R. China
Ping Li
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, P.R. China
Jinhua Wu
Affiliation:
College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, P.R. China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, P.R. China
*
* E-mail address of corresponding author: pppxwu@scut.edu.cn
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Abstract

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The photochemically assisted Fenton reaction (photo-Fenton) is important because it may be particularly effective for the degradation of harmful organic compounds in the environment using solar light. The purpose of the present study was to determine the effectiveness of hydroxy Fe/Al-intercalated montmorillonites (Fe/Al-Mt) as photo-Fenton catalysts. In particular, different Fe/Al molar ratios were of interest as a means to vary catalytic activity. Intercalation was achieved via an ion-exchange method and brilliant orange X-GN was the test compound for photodegradation by hydrogen peroxide (H2O2) under visible-light irradiation (γ < 420 nm) in the presence of Fe/Al-Mt. The Fe/Al-Mt materials obtained were characterized by powder X-ray diffraction, N2 adsorption/desorption, X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopic analysis, and ultraviolet-visible spectroscopy. The decoloration performance of Fe/Al-Mt was investigated using different experimental parameters, including the synthesis method, the Fe/Al molar ratio of the intercalating solution, the catalyst dosage, the H2O2 dosage, and the pH. The results of photo-Fenton reaction showed that the photocatalytic activity of Fe/Al-Mt was enhanced significantly by the extent of hydroxy Al/Fe intercalation. For optimal reaction conditions, 99.92% degradation efficiency of X-GN was achieved after 140 min of reaction. To obtain further information on the visible-light-assisted photo-Fenton process, a high-performance liquid chromatography-mass spectrometry method was applied to indentify the intermediate products and a degradation pathway was proposed.

Keywords

Hydroxy Fe/AlPhoto-FentonIntercalated MontmorilloniteVisible Light
Type
Article
Information
Clays and Clay Minerals , Volume 59 , Issue 5 , October 2011 , pp. 466 - 477
Copyright
Copyright © Clay Minerals Society 2011

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