Synthesis, characterization, and visible-light photo-Fenton catalytic activity of hydroxy Fe/Al-intercalated montmorillonite
Li, Hailing (South China University of Technology. College of Environmental Science and Engineering)
Wu, Pingxiao (The Key Lab. of Environmental Prot. and Eco-Remediation of Guangdong Regular Higher Education Inst.)
Dang, Zhi (The Key Lab. of Environmental Prot. and Eco-Remediation of Guangdong Regular Higher Education Inst.)
Zhu, Nengwu (The Key Lab. of Environmental Prot. and Eco-Remediation of Guangdong Regular Higher Education Inst.)
Li, Ping (Ministry of Education. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters)
Wu, Jinhua (Ministry of Education. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters)

Date:	2011
Abstract:	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 (H O ) under visible-light irradiation (λ > 420 nm) in the presence of Fe/Al-Mt. The Fe/Al-Mt materials obtained were characterized by powder X-ray diffraction, N 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 H O 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.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Hydroxy Fe/Al ; Photo-Fenton ; Intercalated Montmorillonite ; Visible Light
Published in:	Clays and Clay Minerals, Vol. 59, Núm. 5 (2011) , p. 466-477, ISSN 1552-8367

DOI: 10.1346/CCMN.2011.0590504

12 p, 1.2 MB  UAB restricted access

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