Synthesis of photocatalytic TiO2 nanoparticles: optimization of the preparation conditions

Bessekhouad, Y.; Robert, Didier; Weber, J.V.

doi:10.1016/s1010-6030(03)00077-7

Cited by 217 publications

(95 citation statements)

References 13 publications

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“…The properties of TiO 2 are determined by the morphology of its particles, the size of its crystals and its crystalline structure, which depend on the choice of method for its synthesis and final heat treatment [10]. Nanocrystalline TiO 2 particles are usually obtained by crystallization (chemical precipitation) [11], the microemulsion method (reverse micelles) [12], the sol-gel method [13][14][15][16][17] or hydrothermal crystallization [18][19][20][21][22]. Each of these methods has its own advantages and drawbacks, but a common factor that connects them is the ability to obtain materials with strictly defined properties.…”

Section: Introductionmentioning

confidence: 99%

The influence of addition of a catalyst and chelating agent on the properties of titanium dioxide synthesized via the sol–gel method

Siwińska-Stefańska

Zdarta

Paukszta

et al. 2015

J Sol-Gel Sci Technol

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Titanium dioxide powders were prepared via the sol-gel method, using titanium alkoxide as a precursor. It was investigated how the addition of a catalyst (ammonia) and chelating agent (acetylacetone), as well as the temperature of calcination, affects the properties of the resulting TiO 2 powder. The physicochemical properties of samples were determined, including the dispersion, morphology and microstructure of the systems (particle size distribution, TEM images), crystalline structure (XRD), characteristics of porous structure (BET), and thermal stability (TGA/DTA). The samples were also analyzed using Fourier transform infrared spectroscopy. In addition, for selected TiO 2 systems, their photocatalytic activity in the decomposition of C.I. Basic Blue 9 was investigated. Our research results show that the presence of chelating agent in the synthesis of titanium dioxide caused significant changes in dispersive properties, crystalline structure and porous structure parameters. The novel feature of this work is the proposed method of synthesis of highly photoactive titanium dioxide with desirable physicochemical properties in the presence of a chelating agent such as acetylacetone. Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

The influence of addition of a catalyst and chelating agent on the properties of titanium dioxide synthesized via the sol–gel method

Siwińska-Stefańska

Zdarta

Paukszta

et al. 2015

J Sol-Gel Sci Technol

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“…Recently nano-sized TiO2 materials have been attracting a growing interest in their unique catalytic actions, in particular, in photocatalytic reactions [2]. The nano-sized TiO2 materials are prepared by several methods such as solvothermal [3][4][5], precipitation [6], sol-gel [7][8][9], and thermal decomposition [10] methods.…”

Section: Introductionmentioning

confidence: 99%

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

et al. 2014

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Supported Pt catalysts were prepared using several kinds of TiO2 supports different in the crystallite size in the range of 10 -500 nm and their catalytic activity was tested for the liquid-phase hydrogenation of 3-nitrostyrene, nitrobenzene, and styrene. With Pt on smaller TiO2 crystallites (nanocrystals), the selectivity to vinylaniline was improved in the hydrogenation of 3-nitrostyrene (regioselective hydrogenation) and the selectivity to aniline was promoted in the hydrogenation of a mixture of nitrobenzene and styrene (chemoselective hydrogenation). The effects of TiO2 crystallite size were discussed on the basis of the results of turnover frequency and FTIR of CO adsorbed on dispersed Pt particles.Low coordinated and/or electron-rich Pt sites should be formed on the surface of nanocrystal TiO2 supports. Nanocrystal TiO2 support is an important factor for controlling and improving the catalytic performance of dispersed Pt particles.

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“…The enhanced activity of NTP25-15 under UV/solar light was attributed to the synergistic effect observed in the two phase solid material. It is well known that, this pair of polymorphs can effectively reduce the recombination of photogenerated charge carriers to enhance the photocatalytic activity [19,44,45]. Under UV excitation, anatase in the mixed phase gets activated as it is a good absorber of UV light photons as shown in the Scheme 2(i).…”

Section: Correlation Of Anatase:rutile Phase Ratio On the Photocatalymentioning

confidence: 99%

Polymorphic phase transformation of Degussa P25 TiO2 by the chelation of diaminopyridine on TiO62− octahedron: Correlation of anatase to rutile phase ratio on the photocatalytic activity

Rajashekhar

Devi

2013

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tA series of nitrogen-doped Degussa P25 photocatalysts were synthesized successfully by grinding and calcination method using 2,6-diaminopyridine (DAP) as a nitrogen precursor. The prepared samples were characterized by various analytical methods. The phase contents of anatase and rutile in the Degussa P25 powders have been altered by simply changing the proportion of DAP. A mechanism involving chelated DAP molecule on TiO 6 2− octahedron is discussed. The enhanced activity is attributed to synergistic effect in the two phase solid material. Due to the low activation barrier, the effective inter particle electron transfer between the two polymorphs is quite efficient only when they are in close proximity with similar crystallite sizes. The transfer of electrons from the rutile phase to lattice/electron trapping sites of anatase and also to the Ti 3+ -V o defect level created by the dopant favors effective charge separation and enhance the photocatalytic activity under solar illumination.

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Synthesis of photocatalytic TiO2 nanoparticles: optimization of the preparation conditions

Cited by 217 publications

References 13 publications

The influence of addition of a catalyst and chelating agent on the properties of titanium dioxide synthesized via the sol–gel method

The influence of addition of a catalyst and chelating agent on the properties of titanium dioxide synthesized via the sol–gel method

Influence of Crystallite Size of TiO2 Supports on the Activity of Dispersed Pt Catalysts in Liquid-Phase Selective Hydrogenation of 3-Nitrostyrene, Nitrobenzene, and Styrene

Polymorphic phase transformation of Degussa P25 TiO2 by the chelation of diaminopyridine on TiO62− octahedron: Correlation of anatase to rutile phase ratio on the photocatalytic activity

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