Titanium dioxide thin films: the effect of the preparation method in their photocatalytic properties

Acosta, Dwight; Martı́nez, Arturo I.; López, Alcidez A.; Magaña, Carlos

doi:10.1016/j.molcata.2004.09.070

Cited by 39 publications

(21 citation statements)

References 7 publications

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“…[49][50][51] It has been observed in the current study that a anatase/rutile proportion 11/89 only required less than half of the time to degrade rhodamine dye compared to 100% rutile sample. The larger amount of anatase phase is the most likely cause for higher activity of the urea modified sample towards the degradation of the rhodamine dye.…”

mentioning

confidence: 95%

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

et al. 2007

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In the absence of a dopant or precursor modification, anatase to rutile transformation in synthetic TiO 2 usually occurs at a temperature of 600 ºC to 700 ºC. Conventionally, metal oxide dopants (e.g. Al 2 O 3 and SiO 2 ) are used to tune the anatase to rutile transformation. A simple methodology is reported here to extend the anatase rutile transformation by employing various concentrations of urea.XRD and Raman spectroscopy were used to characterize various phases formed during thermal treatment. A significantly higher anatase phase (97%) has been obtained at 800 ºC using a 1:1 (Ti (OPr) 4 : urea) composition and 11% anatase composition is retained even after calcining the powder at 900 ºC. On comparison a sample which has been prepared without urea showed that rutile phases started to form at a temperature as low as 600 °C. The effect of smaller amounts of urea such as 1:0.25 and 1:0.5 (Ti (OPr) 4 :urea) has also been studied and compared. The investigation concluded that the stoichiometric modification by urea 1:1 (Ti (OPr) 4 :urea) composition is most effective in extending the anatase to rutile phase transformation by 200 ºC compared to the unmodified samples. In addition, BET analysis carried out on samples calcined at 500 °C showed that the addition of urea up to 1:1 (Ti (OPr) 4 :urea) increased the total pore volume (from 0.108 cm 3 /g to 0.224 cm 3 /g) and average pore diameter (11 nm to 30 nm) compared to the standard sample. Samples prepared using 1:1 (Ti (OPr) 4 :urea) composition calcined at 900 ºC show significantly higher photocatalytic activity compared to the standard sample prepared under similar conditions. Kinetic analysis shows a marked increase in the photocatalytic degradation of rhodamine 6G on going from the standard sample (0.016 min , decoloration in 50 mins).

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Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

et al. 2007

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“…Films, deposited at room temperature by Hou et al [27], changed into anatase structure after the annealing at 700 °C. Several other researchers could obtain the anatase structure with the (1 0 1) predominant plane by changing the pressure (Ar/O 2 ) [28], the substrate temperature [29] and the impurity doping [30].…”

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confidence: 99%

Preparation and characterization of TiO₂ thin films grown by RF magnetron sputtering

Selmi

Chaabouni

Abaab

et al. 2008

Phys. Status Solidi (c)

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“…[1][2][3] Titanium dioxide nanoparticles (TiO 2 NPs), particularly in their usual commercial form known as P25, have been extensively used to oxidise organic pollutants of water using ultraviolet (UV) light. 2,[4][5][6][7][8] Despite TiO 2 presenting high photocatalytic activity in its anatase form, the charge separation of this semiconductor is only possible by absorption of UV solar photons which represent less than 5% of the solar energy that reaches the Earth's surface. In this sense, sensitisation processes resulting Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin J. Braz.…”

Section: Introductionmentioning

confidence: 99%

Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin Adsorbed on the Surface of TiO₂Nanotubes

Backes

Scheffer

Pereira

et al. 2014

Journal of the Brazilian Chemical Society

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A degradação de soluções aquosas de índigo carmim (IC), azul de metileno (MB) e laranja de metilo (MO) assistida pela luz visível foi conseguida sobre a superfície de nanotubos (NTs) de TiO 2 impregnados com riboflavina (RF). Soluções aquosas diluídas de RF na presença de RF-NTs TiO 2 irradiados com luz UV produziram O 2 , CO e CO 2 como principais produtos gasosos. As mesmas soluções quando irradiadas com luz visível mostraram que o O 2 foi o produto principal obtido. Esta geração de O 2 in situ com luz visível permite a degradação dos corantes, sem a necessidade de borbulhar ar ou oxigênio no sistema de reação. A degradação fotocatalítica de MO, MB e IC pode ser descrita por um modelo de cinética de pseudo-primeira ordem obtendo ca. 100% de degradação de MB, MO e IC em menos de 3 h de iluminação de luz visível. Os resultados aqui apresentados são altamente promissores em vista da potencial aplicação dos catalisadores RF-TiO 2 NTs preparados com dois compostos ambientalmente corretos na degradação de poluentes utilizando radiação solar.Visible light-assisted degradation of indigo carmine (IC), methylene blue (MB) and methyl orange (MO) aqueous solutions has been achieved on the surface of TiO 2 nanotube (NT) arrays impregnated with riboflavin (RF). Diluted RF water solutions in the presence of RF-TiO 2 NTs irradiated with UV light produced O 2 , CO and CO 2 as main gas products. On the contrary, the same solutions irradiated with visible light evolved O 2 as a main product. This in situ O 2 generation under visible light absorption allows the degradation of the dyes without the necessity to bubble air or oxygen in the reaction system The photocatalytic degradation of MO, MB and IC can be described by a pseudo-first-order kinetic model obtaining ca. 100% degradation of MB, MO and IC in less than 3 h of visible light illumination. The results provided here are highly promising in view of various photocatalytic applications of the prepared RF-TiO 2 NTs catalysts by two environmentally friendly compounds in the degradation of pollutants using solar radiation.

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Titanium dioxide thin films: the effect of the preparation method in their photocatalytic properties

Cited by 39 publications

References 7 publications

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Preparation and characterization of TiO₂ thin films grown by RF magnetron sputtering

Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin Adsorbed on the Surface of TiO₂Nanotubes

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Titanium dioxide thin films: the effect of the preparation method in their photocatalytic properties

Cited by 39 publications

References 7 publications

Synthesis of High-Temperature Stable Anatase TiO2 Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO2 Photocatalyst

Preparation and characterization of TiO2 thin films grown by RF magnetron sputtering

Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin Adsorbed on the Surface of TiO2Nanotubes

Contact Info

Product

Resources

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Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Preparation and characterization of TiO₂ thin films grown by RF magnetron sputtering

Photosensitised Degradation of Organic Dyes by Visible Light Using Riboflavin Adsorbed on the Surface of TiO₂Nanotubes