Superfícies fotocatalíticas de titânia em substratos cerâmicos: Parte I: Síntese, estrutura e fotoatividade

Feltrin, Jucilene; Sartor, M. N.; Noni, Agenor De; Bernardin, Adriano Michael; Hotza, Dachamir; Labrincha, J.A.

doi:10.1590/s0366-69132013000400020

Cited by 37 publications

(32 citation statements)

References 57 publications

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“…According to several studies, 4,22,35 the photocatalytic activity of the TiO 2 films improves with increasing film thickness until a limit, from which the degradation reaction remains almost constant or decreases. This limit corresponds to the increase in film opacity, limiting the diffraction of the light through the catalyst and the consequent diffusion of charge carriers.…”

Section: Effect Of the Film Thicknessmentioning

confidence: 99%

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

Marcello¹,

Corrêa²,

Bento³

et al. 2020

J. Braz. Chem. Soc.

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The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO 2 ) 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 TiO 2 film grown at 400 °C, which presented 65.3% of the dye degradation under UV light. The recyclability experiments demonstrated that the TiO 2 films grown by MOCVD present a great stability after several photocatalytic cycles, which allows their practical application for water treatment with high efficiency.

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Section: Effect Of the Film Thicknessmentioning

confidence: 99%

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

Marcello¹,

Corrêa²,

Bento³

et al. 2020

J. Braz. Chem. Soc.

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“…Figure 2 (a) and 2 (b) show the standard sample diffractograms at an angle of 0.5º and the treated samples at angles of 0.5º, 1.0º and 3.0º. In the standard sample, analyzed in 0.5º, are verified the presence of the phases of titanium and of two phases of rutile oxides in 35.59º and 40.96º, being these last ones are due to the formation of the natural oxide layer, present in titanium and some transition metals 1,2,7 . These phases continue to be observed in the other depths of the beam in the treated samples.…”

Section: Methodsmentioning

confidence: 77%

“…The great affinity of titanium with these elements occurs because this metal has an incomplete electronic configuration, in other words, it has free "d" orbitals that promote the formation of chemical bonds with interstitial elements (H, C, N and O) 1,2 . Titanium is also found in the form of oxide, the best known as TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Ionic Oxidation in Cathodic Cage of Titanium CP Grade II

et al. 2017

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Titanium oxides such as rutile and anatase, are materials that stand out for exhibiting properties that act in biomedical and photocatalytic applications, among others. It is extreme importance to idealize new techniques that produce such compounds, being indispensable the improvement of characterizations for these materials. For this purpose, titanium comercially pure (CP) grade II cylindrical samples were oxidized ionically using titanium cage electric shields, oxidized at 350 ° C in 3 and 8 hours. Through Grazing Incidence X-ray Diffraction (GIXRD) analysis, was observed on the surface of the treated samples the formation of a TiO 2 film with the anatase, rutile and brookite phases, the latter phase cited being difficult to produce in conventional thermochemical treatments. All samples treated showed a significant increase in wettability using distilled water. The higer value was for the sample with a 8 hours treatment time, in which this condition presented phases with greater intensity in the analysis of GIXRD.

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“…Os resultados das análises de adsorção de N 2 , utilizando o método BET, área superficial (S BET ) e volume de poros (V p ) encontram-se na Tabela 1. As fases brookita e anatase são formadas em mais baixas temperaturas, e consideradas metaestáveis, pois se transformam na fase rutilo, a qual é mais estável termodinamicamente [34][35][36][37]. Em geral observa-se a fase anatase a partir de baixas temperaturas, da ordem de 450 ºC, sendo esta relacionada à maior atividade fotocatalítica do óxido [36][37][38] Com relação aos resultados apresentados na Tabela 1, observa-se que as amostras contendo maior proporção de carbono possuem maior área superficial e volume total de poros, o que é esperado devido às características texturais dos CXs.…”

Section: Resultsunclassified

Compósitos de xerogéis de carbono/TiO2

et al. 2018

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RESUMO Xerogéis de carbono (CXs) são materiais constituídos por uma estrutura tridimensional formada por esferas nanométricas interligadas e poros interconectados. Diversos trabalhos apresentam os CXs como suporte para utilização em catálise. A principal vantagem destes suportes é que suas propriedades físicas e químicas superficiais podem ser adaptadas às exigências catalíticas. Neste trabalho, compósitos CX/TiO2 foram sintetizados em etapa única, por polimerização/condensação sol-gel de solução formaldeído e resorcinol, com simultânea adição de nanopartículas de TiO2 ou Ti(IV), seguido de secagem e tratamento térmico. Os compósitos foram caracterizados por análise termogravimétrica (TG), difratometria de raios X (DRX), microscopia eletrônica de varredura (MEV), espectroscopia Raman e isotermas de adsorção de nitrogênio (N2) com determinação de área superficial (BET) e volume de poros (Vp). Os resultados mostraram a presença de uma mistura das fases anatase e rutilo do TiO2 nos compostos obtidos. Através das imagens de MEV verificouse grande homogeneidade na distribuição das partículas de TiO2 no suporte de CX. As propriedades fotocatalíticas dos compósitos foram investigadas para fotodegradação de azul de metileno (AM). A cinética de degradação de azul de metileno ajustou-se ao modelo de pseudo primeira ordem. Observou-se um efeito sinérgico entre os sólidos, com um aumento da atividade fotocatalítica nos compósitos de CX/TiO2, em relação ao TiO2.

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Superfícies fotocatalíticas de titânia em substratos cerâmicos: Parte I: Síntese, estrutura e fotoatividade

Cited by 37 publications

References 57 publications

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

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

Ionic Oxidation in Cathodic Cage of Titanium CP Grade II

Compósitos de xerogéis de carbono/TiO2

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