ELIANE CARMO OLIVEIRA
11 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 11
Resumo IPEN-doc 25476 UV–Vis photocatalytic performance of the S-doped TiO2 and TiO2 thin films for water treatment2018 - BENTO, R.T.; SZURKALO, M.; OLIVEIRA, E.C.; CORREA, O.V.; PILLIS, M.F.TiO2 films have been widely used as catalysts in oxidative processes in order to degrade organic contaminant. However, without the presence of a dopant material, its photocatalytic activity is limited only in the region of ultraviolet radiation (UV), due to its high-energy band gap. In this present research, anatase TiO2 thin films were grown on borosilicate substrates by metalorganic chemical vapor deposition (MOCVD) at 400ºC. To make the semiconductor active in the visible light region, sulfur doped TiO2 films were prepared by means of a thermochemical treatment carried out in a tubular oven, under atmosphere of H2S at 50ºC for 60 minutes. The films were characterized by XRD, AFM, FE-SEM and XPS technique. The photocatalytic behavior of the films was evaluated by methyl orange dye degradation under UV-Vis irradiation for 300 minutes. The photocatalytic tests were realized in a reactor illuminated by two tubular UV lamps (352 nm), and in a reactor illuminated by visible light (400-700 nm) on different intensities, both containing 40 mL of the dye solution. The results showed that the S-TiO2 films present promising photocatalytic efficiency. Without the presence of the catalyst, there was no degradation of the methyl orange dye under UV-Vis irradiation. Non-doped TiO2 films do not exhibited photocatalytic activity under visible light. It was possible to observe that the visible light intensity influences the doped films photocatalytic performance.Publicação IPEN-doc 00329 Health physics system scheme for the uranium purification plant1976 - MEYER, M.; OLIVEIRA, E.C.; SORDI, G.M.A.A.; ABRAO, A.Artigo IPEN-doc 20788 Study of electrical, mechanical and microstructural properties of composites based on Cu-Ni-Ag-Alsub(2)Osub(3) obtained by powder metallurgy2014 - MONTEIRO, WALDEMAR A.; CARRIO, JUAN A.G.; OLIVEIRA, E.C.; PREVIATTI, G.G.; SILVA, L.C.E.Resumo IPEN-doc 05715 Energy dependence of pen dosemeters for X-ray (20-60 KV)1994 - OLIVEIRA, E.C.; XAVIER, M.; CALDAS, L.V.E.Resumo IPEN-doc 05482 Performance of pen dosemeters in low energy X radiation fields1994 - OLIVEIRA, E.C.; XAVIER, M.; CALDAS, L.V.E.Artigo IPEN-doc 04540 Influencia do simulador de lucite na calibracao de canetas dosimetricas1992 - OLIVEIRA, E.C.; XAVIER, M.; CALDAS, L.V.E.Artigo IPEN-doc 04879 Monitoring survey instruments benhaviour in standard low energy X-rays1996 - OLIVEIRA, E.C.; CALDAS, L.V.E.Artigo IPEN-doc 03830 Canetas dosimetricas em campos de raios x de energias baixas1996 - OLIVEIRA, E.C.; CALDAS, L.V.E.Artigo IPEN-doc 03521 Estabelecimento de campos padroes de raios-x de energias baixas, nivel radioprotecao, para calibracao de instrumentos1996 - OLIVEIRA, E.C.; CALDAS, L.V.E.Dissertação IPEN-doc 04995