Low-temperature preparation of nanocrystalline TiO2 photocatalyst with a very large specific surface area

Liu, A.R.; Wang, S.M.; Zhao, Yang; Zheng, Zhi

doi:10.1016/j.matchemphys.2005.10.003

Cited by 76 publications

(30 citation statements)

References 16 publications

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“…Anatase-brookite composites were more efficient than P25 for the photodegradation of methyl orange [78,79], methylene blue [158], rhodamine B [159][160][161][162], phenol [79,159], salicylic acid [79], acetaldehyde [163] and propanone in air [164,165].…”

Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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Abstract:Brookite is the least studied TiO 2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported. Attention has been paid both to the most traditional methods, such as hydrothermal processes at high temperatures and pressures, and to environmentally benign syntheses using water soluble compounds and water as the solvent. Papers reporting the photocatalytic activity of pure and brookite-based samples have been reviewed.

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Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

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“…A large specific surface area of TiO 2 enhances the photocatalytic degradation rate of organic pollutants as availability of active sites in TiO 2 is increased [31,32]. Crystallite size is another important characteristic that determines the quality of TiO 2 .…”

Section: Effects Of Dopants In the Formation Ofmentioning

confidence: 99%

“…Some researchers reported that smaller crystallite size of nano-doped-TiO 2 induced a larger band gap due to the increased redox ability [31]. The resultant photocatalytic activity benefits from the quantum size effect of nano-doped-TiO 2 that enhances its photocatalytic activity [32].…”

Section: Effects Of Dopants In the Formation Ofmentioning

confidence: 99%

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Tan

Wong

Mohamed

2011

ISRN Materials Science

111

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This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO 2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO 2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO 2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO 2 , initial reactant concentration, dosage of doped TiO 2 , and dopant doping concentration.

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“…The use of high temperatures would result in the growth of crystal particles, causing structural collapse and, therefore, decrease in the specific surface area of TiO 2 . A reasonable pathway to avoid these problems would be to lower the temperature of the phase transition [32] and, in this sense, methods based on crystallization of titania by mild acid treatments are being studied [33,34,35]. The novelty of this work is to study the influence of hydriodic acid (HI) in the synthesis and extraction-crystallization steps and hence on the properties of TiO 2 nanoparticles, and also the application of the prepared materials in the photocatalytic oxidation of propene, since the catalysts previously prepared were used for the removal of contaminants in liquid phase, showing low activity.…”

Section: Introductionmentioning

confidence: 93%

Synthesis of high surface area TiO2 nanoparticles by mild acid treatment with HCl or HI for photocatalytic propene oxidation

Ouzzine

Maciá-Agulló

Lillo-Ródenas

et al. 2014

Applied Catalysis B: Environmental

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Elsevier Ouzzine, M.; Maciá Agulló, JA.; Lillo-Ródenas, MA.; Quijada Tomás, C.; Linares-Solano, A. (2014). Synthesis of high surface area TiO2 nanoparticles by mild acid treatment with HCl or HI for photocatalytic propene oxidation. Applied Catalysis B: Environmental. 154-155:285-293. doi:10.1016/j.apcatb.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 Page 4 of 34A c c e p t e d M a n u s c r i p t Abstract Nanostructured TiO 2 photocatalysts with small crystalline sizes have been synthesized by sol-gel using the amphiphilic triblock copolymer Pluronic P123 as template. A new synthesis route, based on the treatment of TiO 2 xerogels with acid-ethanol mixtures in two different steps, synthesis and extraction-crystallization, has been investigated, analyzing two acids, hydrochloric and hydriodic acid. As reference, samples have also been prepared by extraction-crystallization in ethanol, being these TiO 2 materials amorphous and presenting higher porosities. The prepared materials present different degrees of crystallinity depending on the experimental conditions used. In general, these materials exhibit high surface areas, with an important contribution of microporosity and mesoporosity, and with very small size anatase crystals, ranging from 5 to 7 nm.The activity of the obtained photocatalysts has been assessed in the oxidation of propene in gas phase at low concentration (100 ppmv) under a UVA lamp with 365 nm wavelength. In the conditions studied, these photocatalysts show different activities in the oxidation of propene which do not depend on their surface areas, but on their crystallinity and band gap energies, being sample prepared with HCl both during synthesis and in extraction-crystallizations steps, the most active one, with superior performance than Evonik P25.

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Low-temperature preparation of nanocrystalline TiO2 photocatalyst with a very large specific surface area

Cited by 76 publications

References 16 publications

Brookite, the Least Known TiO2 Photocatalyst

Brookite, the Least Known TiO2 Photocatalyst

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Synthesis of high surface area TiO2 nanoparticles by mild acid treatment with HCl or HI for photocatalytic propene oxidation

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