Synthesis of TiO2-coated CoFe2O4 photocatalysts applied to the photodegradation of atrazine and rhodamine B in water

Autor(es)

Mourao, Henrique A. J. L. ^[1] ; Malagutti, Andrea R. ^[2] ; Ribeiro, Caue ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Vales Jequitinhonha & Mucuri, Dept Farm, BR-39100000 Diamantina, MG - Brazil

^[3] Embrapa Instrumentacao Agropecuaria, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS A-GENERAL; v. 382, n. 2, p. 284-292, JUL 15 2010.
• Citações Web of Science: 66

Resumo

Various strategies for the synthesis of anatase TiO(2) nanoparticles and nanocomposites with particular morphologies and stability are currently generating a lot of interest and many research papers. In this study, composites of TiO(2)/COFe(2)O(4) in nanometric sizes were prepared by the polymeric precursor method. These materials were characterized by X-ray diffraction, Raman spectroscopy, surface area through N(2) physisorption, Zeta potential, scanning and high-resolution transmission electron microscopy. The photocatalytic potential of the nanocomposites prepared was assessed by photodegradation of rhodamine B dye and atrazine pesticide under UV light. The materials showed photocatalytic activity due to the presence of TiO(2) on their surface, associated with the magnetic activity of CoFe(2)O(4) cores, which is useful for the separation and recovery of the photocatalysts after use in an oxidative process. In rhodamine photodegradation, pure TiO(2) showed higher photocatalytic efficiency than the nanocomposites. However, in atrazine photodegradation, the nanocomposites were more effective, being this effect attributed to difference in charge at the surface of pure TiO(2) and of nanocomposites, which enables adsorption processes of atrazine molecules on nanocomposites surface, and consequently, their higher photoactivity. (c) 2010 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/53026-6 - Síntese e caracterização de nanopartículas core-shell de Fe3O4@SnO2 e Fe3O4@TiO2 para aplicações na despoluição de águas
• Beneficiário: Henrique Aparecido de Jesus Loures Mourão
• Modalidade de apoio: Bolsas no Brasil - Mestrado