Synthesis, characterization and catalytic evaluation of cubic ordered mesoporous iron-silicon oxides
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2010
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Resumo |
Iron was successfully incorporated in FDU-1 type cubic ordered mesoporous silica by a simple direct synthesis route. The (Fe/FDU-1) samples were characterized by Rutherford back-scattering spectrometry (RBS), small angle X-ray scattering (SAXS). N(2) sorption isotherm, X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). The resulting material presented an iron content of about 5%. Prepared at the usual acid pH of -0.3, the composite was mostly formed by amorphous silica and hematite with a quantity of Fe(2+) present in the structure. The samples prepared with adjusted pH values (2 and 3.5) were amorphous. The samples` average pore diameter was around 12.0 nm and BET specific surface area was of 680 m(2) g(-1). Although the iron-incorporated material presented larger lattice parameter, about 25 nm compared to pure FDU-1, the Fe/FDU-1 composite still maintained its cubic ordered fcc mesoporous structure before and after the template removal at 540 degrees C. The catalytic performance of Fe/FDU-1 was investigated in the catalytic oxidation of Black Remazol B dye using a catalytic ozonation process. The results indicated that Fe/FDU-1 prepared at the usual acid pH exhibited high catalytic activity in the mineralization of this pollutant when compared to the pure FDU-1. Fe(2)O(3) and Fe/FDU-1 prepared with higher pH of 2 and 3.5. (C) 2010 Elsevier B.V. All rights reserved. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) |
Identificador |
MATERIALS CHEMISTRY AND PHYSICS, v.124, n.1, p.713-719, 2010 0254-0584 http://producao.usp.br/handle/BDPI/29022 10.1016/j.matchemphys.2010.07.042 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE SA |
Relação |
Materials Chemistry and Physics |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE SA |
Palavras-Chave | #Mesoporous materials #Iron oxide #Catalyst #Ozonation process #OXIDATION CHANGES UNDERGONE #PAPER-MILL EFFLUENT #X-RAY-ABSORPTION #MOLECULAR-SIEVES #IN-SITU #HETEROGENEOUS CATALYSTS #CRYSTALLINE WALLS #TEMPLATE REMOVAL #FE-SILICALITE #TEMPERATURE #Materials Science, Multidisciplinary |
Tipo |
article original article publishedVersion |