Mesoporous silica iron-doped as stable and efficient heterogeneous catalyst for the degradation of C.I. Acid Orange 7 using sono–photo-Fenton process

Iron-containing mesostructured silica (Fe₂O₃/SBA-15) was prepared and used as heterogeneous catalyst in the integrated sono–photo-Fenton process. The effect of hydrogen peroxide concentration, initial pH, Fe₂O₃/SBA-15 loading, ultrasonic power, and initial solution concentration on the decolorizatio...

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Bibliographic Details
Published in:Separation and purification technology 2011-07, Vol.80 (1), p.163-171
Main Authors: Zhong, Xin, Royer, Sebastien, Zhang, Hui, Huang, Qianqian, Xiang, Luojing, Valange, Sabine, Barrault, Joel
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
catalysts
Catalytic reactions
Chemical engineering
Chemistry
Crystallization, leaching, miscellaneous separations
decolorization
Exact sciences and technology
gas chromatography
General and physical chemistry
Heat and mass transfer. Packings, plates
hydrogen peroxide
leaching
mass spectrometry
mass transfer
particle size distribution
Reactors
silica
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Iron-containing mesostructured silica (Fe₂O₃/SBA-15) was prepared and used as heterogeneous catalyst in the integrated sono–photo-Fenton process. The effect of hydrogen peroxide concentration, initial pH, Fe₂O₃/SBA-15 loading, ultrasonic power, and initial solution concentration on the decolorization of C.I. Acid Orange 7 (AO7) by the integrated heterogeneous sono–photo-Fenton process was investigated in order to optimize process efficiency. The results showed that the decolorization efficiency increased with the increase of hydrogen peroxide concentration, ultrasonic power, Fe₂O₃/SBA-15 loading, but decreased with the increase of initial pH and initial dye concentration. Catalyst stability was evaluated by measuring iron leaching in solution. The particles size distribution of spent catalyst evidenced a remarkable size reduction during reaction, leading to more reactive surface and higher mass transfer rate. The main reaction intermediates were separated and identified using GC–MS and a possible degradation pathway was proposed.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2011.04.024