Various TiO2 microcrystals: Controlled synthesis and enhanced photocatalytic activities

Wei, Fengyu; Zeng, Hualing; Cui, Peng; Peng, Shuchuan; Cheng, Tianhu

doi:10.1016/j.cej.2008.06.015

Cited by 26 publications

(15 citation statements)

References 20 publications

(22 reference statements)

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“…However, due to the complicated separation of suspended ultrafine solid catalysts from the reaction medium, its practical application appears to be difficult so far [3,4]. Immobilization of TiO 2 is an effective strategy to overcome the problem of posttreatment separation [5,6], but it usually diminished photocatalytic activity because of the reduction in available surface area and active surface sites of the catalyst [7]. Consequently, there has been increased interest in developing an alternative photocatalyst which possesses both high photocatalytic activity and good separation performance.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous photocatalysis of methylene blue over titanate nanotubes: Effect of adsorption

Xiong

Sun

Yang

et al. 2011

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Heterogeneous photocatalysis of methylene blue over titanate nanotubes: Effect of adsorption

Xiong

Sun

Yang

et al. 2011

Journal of Colloid and Interface Science

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“…Brookite is the least studied because of the difficulties in synthesizing the pure form, though it was reported to show remarkable photocatalytic activity [10][11][12]. However, much experimental evidence supported that the existence of a synergistic effect between anatase and rutile phases results in an enhancement of photocatalytic activity, due to reducing the recombination of photogenerated electrons and holes [13][14][15][16][17][18][19][20][21]. Other mixed phases, such as brookite/rutile [22][23][24], brookite/anatase [25][26][27][28], and ternary mixture (anatase, rutile, and brookite) [29][30][31][32], have also been reported up to date.…”

Section: Introductionmentioning

confidence: 99%

Tartaric acid-assisted preparation and photocatalytic performance of titania nanoparticles with controllable phases of anatase and brookite

et al. 2012

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Titanium dioxide with different ratios of anatase to brookite has been prepared by a facile hydrothermal method in the presence of tartaric acid. The resulting samples were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectra, and Brunauer-Emmett-Teller analysis. The contents of anatase and brookite in the TiO 2 particles have been successfully controlled by simply adjusting molar ratio of tartaric acid to Ti in reaction system. The degradation of Rhodamine B in aqueous solutions reveals that the catalyst containing 78.7 % anatase and 21.3 % brookite has the highest photocatalytic activity. A proposed mechanism is discussed to interpret the evolution of the phases based on the effect of different C 4 H 6 O 6 /Ti molar ratios.

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“…When activated, an electron hole pair is created: the electron is promoted from the valence band to the conduction band while the hole stays in the valence band. Due to this phenomenon, titania can act as a photo-catalyst for oxidation of organic matter that react with the very oxidizing free radicals formed by reaction with the charge carriers in presence of water and/or oxygen molecules [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High-throughput analysis for preparation, processing and analysis of TiO2 coatings on steel by chemical solution deposition

Gil

Driessche

Gils

et al. 2012

Journal of Alloys and Compounds

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a b s t r a c tA high-throughput preparation, processing and analysis of titania coatings prepared by chemical solution deposition from water-based precursors at low temperature (%250°C) on two different types of steel substrates (Aluzinc Ò and bright annealed) is presented. The use of the high-throughput equipment allows fast preparation of multiple samples saving time, energy and material; and helps to test the scalability of the process. The process itself includes the use of IR curing for aqueous ceramic precursors and possibilities of using UV irradiation before the final sintering step. The IR curing method permits a much faster curing step compared to normal high temperature treatments in traditional convection devices (i.e., tube furnaces).The formulations, also prepared by high-throughput equipment, are found to be stable in the operational pH range of the substrates (6.5-8.5). Titanium alkoxides itself lack stability in pure water-based environments, but the presence of the different organic complexing agents prevents it from hydrolysis and precipitation reactions. The wetting interaction between the substrates and the various formulations is studied by the determination of the surface free energy of the substrates and the polar and dispersive components of the surface tension of the solutions. The mild temperature program used for preparation of the coatings however does not lead to the formation of pure crystalline material, necessary for the desired photocatalytic and super-hydrophilic behavior of these coatings. Nevertheless, some activity can be reported for these amorphous coatings by monitoring the discoloration of methylene blue in water under UV irradiation.

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Various TiO2 microcrystals: Controlled synthesis and enhanced photocatalytic activities

Cited by 26 publications

References 20 publications

Heterogeneous photocatalysis of methylene blue over titanate nanotubes: Effect of adsorption

Heterogeneous photocatalysis of methylene blue over titanate nanotubes: Effect of adsorption

Tartaric acid-assisted preparation and photocatalytic performance of titania nanoparticles with controllable phases of anatase and brookite

High-throughput analysis for preparation, processing and analysis of TiO2 coatings on steel by chemical solution deposition

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