Photocatalytic activity of TiO2 films with mixed anatase and rutile structures prepared by pulsed laser deposition

Zhao, Lei; Han, Miaomiao; Lian, Jianshe

doi:10.1016/j.tsf.2007.10.102

Cited by 74 publications

(56 citation statements)

References 20 publications

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“…14) Among various semiconductors employed, titanium dioxide (TiO 2 ) is well known to be an excellent photocatalyst because of its high transparency in visible light, good photocatalytic behavior and favorable chemical stability. 5,6) Zinc oxide, as a direct wide-band-gap semiconductor with a band gap of 3.37 eV and a large exciton binding energy of 60 meV at room temperature, is discovered to be important semiconductor photocatalysis in recent years. 710) And there have been several examples of ZnO displaying more impressive photocatalytic activity than widely studied titanium dioxide.…”

Section: Introductionmentioning

confidence: 99%

Structure and Photocatalysis of TiO<sub>2</sub>/ZnO Double-Layer Film Prepared by Pulsed Laser Deposition

et al. 2012

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Nanocrystalline double-layer film of TiO 2 /ZnO was prepared by pulsed laser deposition on quartz substrate and their microstructure, optical property and photocatalysis were investigated. The first/bottom ZnO layer grew on its [001] direction of the wurtzite structure, while the second/top TiO 2 layer consisted of nanorods grown on the [001] direction of its anatase structure. The TiO 2 /ZnO film showed improved photoabsorption in visible light in the UVvisible absorption spectrum; and showed weaken UV emission and enhanced deep level emission in the photoluminescence spectrum. By the degradation of methyl orange and methylene blue, the TiO 2 /ZnO film exhibited evident enhanced photodegradation efficiency in a wide wavelength range. That can be explained by the enhanced wavelength response in visible range, more effective use of irradiation light and the retarded recombination of electronhole pairs in the double layer films.

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Section: Introductionmentioning

confidence: 99%

Structure and Photocatalysis of TiO<sub>2</sub>/ZnO Double-Layer Film Prepared by Pulsed Laser Deposition

et al. 2012

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“…The use of UV lasers in heterogeneous photocatalysis has been very limited to date due to the high cost of lasers, specialist training required for their operation, unsuitability for reactor design and the safety concerns associated with the use of lasers. Where they have been used, specific applications like pulsed laser deposition (PLD) [50][51][52], controlled periodic illumination (CPI) [53] and laser flash photolysis [54][55][56][57] have been investigated. However, there is also general interest in laser irradiated heterogeneous photocatalysis because of the unique properties of UV light produced from a laser beam which have been previously reported to enhance photocatalytic efficiency and conversion [58,59].…”

Section: Uv Lasersmentioning

confidence: 99%

UV LED Sources for Heterogeneous Photocatalysis

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Lawton

et al. 2014

The Handbook of Environmental Chemistry

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This review article presents an overview of the application of ultraviolet light-emitting diode (UV LED) sources in heterogeneous photocatalysis within the context of artificial UV sources. The feasibility of UV LEDs as a source of UV irradiation in heterogeneous photocatalysis was first demonstrated almost a decade ago; however, for the most part, photocatalytic experimental set-ups utilise artificial light sources in the form of conventional UV lamps to initiate the desired photocatalytic transformations. A look at all sources of UV irradiation used in heterogeneous photocatalysis is taken with a focus on the growing importance of solid-state lighting devices such as UV LEDs. UV LEDs have higher external quantum efficiency and a lifetime of over 100,000 h; they are small in size and produce directional UV light which can be of the desired wavelength. In recent times, these UV LED sources have become widely applied in heterogeneous photocatalysis studies in the research literature and are fast becoming a viable alternative to conventional UV lamps.

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“…As duas primeiras apresentam estruturas cristalinas tetragonais (volume espacial P4 2 /mnm e Z= 2 para o rutilo; I4 1 /amd e Z= 4 para a anatase) enquanto a brookita apresenta estrutura ortorrômbica (volume espacial Pbca e Z= 8) [23,25,35,36]. A Fig.…”

Section: Estrutura Cristalinaunclassified

“…Uma das características notáveis do óxido de titânio é seu forte poder oxidativo relacionado com os buracos positivos, que é maior que o poder redutor dos elétrons na banda de condução [35]. A superfície de um fotocatalisador contém água absorvida.…”

Section: Ativação Fotocatalíticaunclassified

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

et al. 2013

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ResumoA fotocatálise é um processo de oxidação avançada capaz de transformar uma grande variedade de poluentes orgânicos tóxicos em substâncias inofensivas em condições ambientes. Porém, a utilização do dióxido de titânio na fase anatase em produtos cerâmicos é limitada devido à transformação para fase rutilo em temperaturas superiores a 400 °C. As pesquisas apontam caminhos promissores para inibir a formação da fase rutilo através da introdução de dopantes na estrutura do semicondutor. Neste trabalho, foi realizada uma revisão dos principais aspectos encontrados na literatura especializada sobre fotocatálise com dióxido de titânio, em particular a relação entre estrutura química e atividade fotocatalítica. Palavras-chave: fotocatálise, dióxido de titânio, superfícies cerâmicas. Abstract Photocatalysis has been considered as an advanced oxidation process capable of transforming a large variety of toxic organic

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Photocatalytic activity of TiO2 films with mixed anatase and rutile structures prepared by pulsed laser deposition

Cited by 74 publications

References 20 publications

Structure and Photocatalysis of TiO<sub>2</sub>/ZnO Double-Layer Film Prepared by Pulsed Laser Deposition

Structure and Photocatalysis of TiO<sub>2</sub>/ZnO Double-Layer Film Prepared by Pulsed Laser Deposition

UV LED Sources for Heterogeneous Photocatalysis

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

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