Preparation of nitrogen-doped titania with high visible light induced photocatalytic activity by mechanochemical reaction of titania and hexamethylenetetramine

Yin, Shu; Yamaki, Hirofumi; Komatsu, Masakazu; Zhang, Qiwu; Wang, Jinshu; Tang, Qing; Sanda, Fumio; Sato, Tsugio

doi:10.1039/b309217h

Cited by 202 publications

(122 citation statements)

References 18 publications

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“…Quantification of phase proportions usually is carried out by X-ray diffraction (XRD) [1,78,81,105,[120][121][122][123][124][125]. Such analyses often are done using the method of Spurr and Myers [126], which utilises the ratio of the rutile (110) peak at 27.355°2h to the anatase (101) peak at 25.176°2h.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Review of the anatase to rutile phase transformation

2010

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Titanium dioxide, TiO 2 , is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance of the material. The present work reviews the anatase to rutile phase transformation. The synthesis and properties of anatase and rutile are examined, followed by a discussion of the thermodynamics of the phase transformation and the factors affecting its observation. A comprehensive analysis of the reported effects of dopants on the anatase to rutile phase transformation and the mechanisms by which these effects are brought about is presented in this review, yielding a plot of the cationic radius versus the valence characterised by a distinct boundary between inhibitors and promoters of the phase transformation. Further, the likely effects of dopant elements, including those for which experimental data are unavailable, on the phase transformation are deduced and presented on the basis of this analysis.

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Section: X-ray Diffractionmentioning

confidence: 99%

Review of the anatase to rutile phase transformation

2010

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“…A nitrogen-doped TiO 2 material with a visible light responsibility was reported by Sato for the first time in 1986 [3], and recently, several groups reported the visible-light responsibility of N-doped TiO 2 materials prepared by different methods [4][5][6][7][8][9]. We recently reported that when nanocrystalline Si-doped titanias prepared by thermal reactions of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol (glycothermal reaction) were heated in NH 3 at high temperatures, N-and Si-codoped titanias with higher nitrogen contents were obtained, and that the obtained samples exhibited high photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation

2007

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Si-doped titanias with a Si/Ti charged ratio of 0.2 was prepared by thermal reactions of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol at 300°C (glycothermal reaction) and N-and Si-co-doped titanias were prepared by heating the thus-obtained Si-doped titanias in an NH 3 flow. N-and Si-co-doped titanias had a stronger absorption in a visible light region of 400-550 nm, and exhibited high photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation. In this study, N-and Si-co-doped titanias were further modified with vanadium by an impregnation method using an ammonium vanadate solution, and the obtained catalysts were characterized by XRD, BET surface area measurement, UV-vis, and ESR. Photocatalytic decomposition of acetaldehyde using the V-loaded N-and Si-co-doped titanias was examined and it was demonstrated that a very small amount of V-loading (V/Ti = 0.0001-0.001) significantly enhanced the photocatalytic activity under visible-light irradiation.

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“…13) Both methods need calcination at high temperatures above 600°C and it is suspected that the calcination results in the decrease in nitrogen content and increase in the crystallite size, consequently decrease in the photocatalytic activity. Therefore, nitrogen ion-doped titania nanoparticles were prepared by soft chemical processes such as mechanochemical reaction 14) and homogeneous precipitation under a solvothermal condition 15),16) without calcination. In case of solvothermal reaction, after dissolving the desired amount of hexamethylenetetramine in the titanium trichloride aqueous solution, the solution was heated at 90°C for 1 h to decompose the hexamethylenetetramine to ammonia and formaldehyde and to proceed homogeneous precipitation of amorphous hydrous titania doped with nitrogen, followed by heating at around 200°C to crystallize the sample, where the final solution pH can be adjusted by changing the initial amount of hexamethylenetetramine.…”

Section: Preparation Of Visible Light Responsive Titania Photocatalysmentioning

confidence: 99%

Synthesis of environmentally friendly ceramic materials via solvothermal reactions

Sato

2010

J. Ceram. Soc. Japan

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Solvothermal reactions are designated as the reactions which use high temperatures and/or high pressure solvents. It is possible to control the acidbase reaction rate, morphology and agglomeration of the products, i.e., well dispersed nanoparticles with high crystallinity can be obtained by solvothermal reactions. Therefore, solvothermal reactions are expected to be used to generate environmentally friendly functional ceramic materials. Actually, various functional ceramics, such as tetragonal zirconia, with excellent thermal stability and mechanical properties, visible light responsive photocatalyst for environmental clean-up, high performance UV-shielding materials, etc. have been fabricated by solvothermal reactions. Unique plate-like ceria microparticles and the new Sn(II) titanate based compound which are impossible to be formed via a normal solid state reaction have also been formed.

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Preparation of nitrogen-doped titania with high visible light induced photocatalytic activity by mechanochemical reaction of titania and hexamethylenetetramine

Cited by 202 publications

References 18 publications

Review of the anatase to rutile phase transformation

Review of the anatase to rutile phase transformation

Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation

Synthesis of environmentally friendly ceramic materials via solvothermal reactions

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