Ground vermiculite as catalyst for the Fenton reaction

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• 作者：Aluir D. Purceno^a ; Ana Paula C. Teixeira^a ; Aline B. Souza^a ; José ; D. Ardisson^b ; Joã ; o P. de Mesquita^a ; Rochel M. Lago^a ; ^{rochel@ufmg.br}
• 关键词：Vermiculite ; Fenton ; Hormone ; Dye
• 刊名：Applied Clay Science
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：69
• 期：Complete
• 页码：87-92
• 全文大小：1003 K

文摘

Vermiculite was ground for different times (0.5, 1, 20 and 60 min) and used to promote the heterogeneous Fenton like reaction to oxidize the water contaminants ethinylestradiol (EE) and the model dye indigo carmine (IC). M?ssbauer, XRD, particle size, SEM, TEM, BET and atomic absorption showed that ground expanded vermiculite (EV) yielded in water highly dispersed microlayer fragments with iron as Fe^2 + (30 % ) and Fe^3 + (70 % ) exposed on the surface. These surface Fe species showed high efficiency to activate H₂O₂ to oxidize organic molecules in water in a Fenton like reaction at pH near 7. These results were discussed in terms of Fe species immobilized on the surface of the clay mineral fragments which remain exposed during the reaction and active to generate radicals from H₂O₂.