Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD

Autor(es)

Marcello, Bianca A. ^[1] ; Correa, V, Olandir ; Bento, Rodrigo T. ^[2] ; Pillis, Marina F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Comissao Nacl Energia Nucl CNEN, Inst Pesquisas Energet & Nucl IPEN, Av Prof Lineu Prestes 2242, Sao Paulo 05508000, SP - Brazil

^[2] Correa, Olandir, V, Univ Sao Paulo, Comissao Nacl Energia Nucl CNEN, Inst Pesquisas Energet & Nucl IPEN, Av Prof Lineu Prestes 2242, Sao Paulo 05508000, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 31, n. 6, p. 1270-1283, JUN 2020.
• Citações Web of Science: 0

Resumo

The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO2) films grown by metalorganic chemical vapor deposition (MOCVD) at 400 and 500 °C, in different growth times. The photocatalytic behavior was analyzed by measuring the methyl orange dye degradation at different pH values. Structural and morphological characteristics, and the recyclability of the catalysts for several cycles were also investigated. Anatase phase was identified in all films. The higher photodegradation performances were obtained at acidic pH. The results demonstrated that the photocatalyst thickness is an important parameter in heterogenous photocatalysis. The best photocatalytic result occurred for the 395 nm-thick TiO2 film grown at 400 °C, which presented 65.3% of the dye degradation under UV light. The recyclability experiments demonstrated that the TiO2 films grown by MOCVD present a great stability after several photocatalytic cycles, which allows their practical application for water treatment with high efficiency. (AU)

• Processo FAPESP: 05/55861-4 - Projeto, montagem e entrada em operacao de um equipamento mocvd para obtencao de revestimentos micro/nanoestruturados.
• Beneficiário: Marina Fuser Pillis
• Modalidade de apoio: Auxílio à Pesquisa - Regular