Sol–gel-derived VχTi1−χO2 films and their photocatalytic activities under visible light irradiation

Iketani, Kazuya; Sun, Ren‐De; Toki, Motoyuki; Hirota, Ken; Yamaguchi, Osamu

doi:10.1016/j.mseb.2003.09.013

Cited by 77 publications

(59 citation statements)

References 31 publications

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“…The photo-catalytic activity is dependent on the vanadium content, and the optimum vanadium dopant concentration is 0.01 mol%. The result is consistent with that of a previous study (Iketani et al, 2004).…”

Section: Photo-catalytic Activities Of V/tiosupporting

confidence: 94%

“…It is indicated that the photo-catalytic activity of V/Ti = 1 mol% is lower. It is speculated that V 5+ ions have harmful effect on the photo-catalytic activity in the previous studies (Martin et al, 1994b;Iketani et al, 2004) and the formation of V 5+ ions is easy at high vanadium dopant concentration (Iketani et al, 2004). Therefore, our results consist with those of the reports.…”

Section: Photo-catalytic Activities Of V/tiosupporting

confidence: 87%

“…A shoulder to the main V 2p 3/2 peak can be observed at 514.4 eV and is assigned to be V (III) (Moulder et al, 1995;NIST Chemistry WebBook, 2005). It has been reported that the formation of V 5+ is easy at high vanadium dopant concentration (Iketani et al, 2004). However, the V 2p 3/2 spectra of V 2 O 5 (517.4 eV) are not observed from XPS data.…”

Section: Uv-vis Absorption Spectra Of V/tiomentioning

confidence: 89%

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Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Hung

Chen

Chu

2014

Aerosol Air Qual. Res.

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The nano-sized V/TiO 2 prepared by a sol-gel method calcined at 500°C for 3 h was characterized in this study. The synthesized photo-catalysts were used for the photo-degradation of 1, 2-dichloroethane (1, 2-DCE). From X-ray powder diffraction data, the crystal phase presents the mixture of anatase and rutile phases with anatase the dominant phase. From TEM images, the crystallites of photo-catalysts are spherical particles with a crystallite size about 10-20 nm. UV-Visible absorption spectra of V/TiO 2 show a slightly increase in absorbance in the visible light region with the increasing vanadium ion doping concentration. The X-ray photoelectron spectroscopy results indicate that the doped vanadium ions exist in the form of V (IV). The V (IV) may alleviate the surface poison phenomenon and act as both h + /e -traps to reduce the recombination rate of h + /e -pairs, and the optimum vanadium doping amount is 0.01 mol%. The products and byproducts of 1, 2-DCE photo-degradation include H 2 O, CO, CO 2 , C 2 H 5 Cl, CH 2 Cl 2 , and HCl.

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Section: Photo-catalytic Activities Of V/tiosupporting

confidence: 94%

Section: Photo-catalytic Activities Of V/tiosupporting

confidence: 87%

Section: Uv-vis Absorption Spectra Of V/tiomentioning

confidence: 89%

See 1 more Smart Citation

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Hung

Chen

Chu

2014

Aerosol Air Qual. Res.

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“…In addition, the effect of dopant has a primary role in extending the light absorption and conversion capacities of TiO 2 to the visible light. A wide range of metal ions have been used to prepare the chemically metal-doped TiO 2 [2][3][4][5][6][7][8], the physically metalimplanted TiO 2 [9][10][11], and the TiO 2 -based binary oxide [4]. Their effects on the properties of the doped samples have been reported.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of the efficiency of Fe-doped TiO₂prepared by two doping methods and photocatalytic degradation of phenol in domestic water suspensions

Nahar¹,

Hasegawa

Kagaya

et al. 2007

Science and Technology of Advanced Materials

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Fe-doped TiO 2 particles responding to visible light were synthesized by impregnation and calcination method using TiO 2 particle and Ti element, respectively. The optical and the chemical properties were characterized by measuring the X-ray diffraction (XRD) and UV-visible spectroscopy. The onset of absorption shifted to longer wavelengths on doping TiO 2 by the calcination process, which showed a better response as compared to the impregnation method. The photocatalytic reactivity was evaluated by the degradation of phenol with impregnated Fe-doped (0.5% w/w in Fe) and calcined Fe-doped (Fe x Ti 1Àx O 2 , x ¼ 0.005 (Fe/Ti molar ratio)) TiO 2 separately in distilled and tap water. The characterization results have confirmed the advanced possibility of correlation between photoactivity and the special property of sulfur-containing calcined Fe-doped TiO 2 . In case of the coagulation of the undoped A-I and the Fe-doped B-I, the photoactivity showed a decrease due to the presence of natural electrolytes and due to the high pH of tap water, whereas in the case of the coagulation of calcined Fe-doped TiO 2 prepared from sulfides (Fe x TiS 2 ), the photoactivity showed an increase. In this study, highest catalytic activity was found to be strongly dependent both on catalyst structure and on the type of water used.

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“…Several different strategies have been used to extend photoactivity into the visible region. They include (i) doping with anions (e.g., nitrogen, 1-3 sulfur, 4 iodine, [5][6][7] and fluorine 8 ), (ii) doping with metal ions, [9][10][11][12][13][14][15][16][17][18] and (iii) functionalizing TiO 2 with photosensitizers that absorb visible light. 19,20 The most actively pursued strategy has been to increase the photoactive wavelength range and to enhance the photocatalytic activity under UV irradiation by metal ion doping of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Combinatorial doping of TiO₂ with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

2010

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Titanium dioxide (TiO 2 ) was doped with the combination of several metal ions including platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni). The doped TiO 2 materials were synthesized by standard sol-gel methods with doping levels of 0.1 to 0.5 at.%. The resulting materials were characterized by x-ray diffraction (XRD), BET surface-area measurement, scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (DRS). The visible light photocatalytic activity of the codoped samples was quantified by measuring the rate of the oxidation of iodide, the rate of degradation of methylene blue (MB), and the rate of oxidation of phenol in aqueous solutions at l > 400 nm. 0.3 at.% Pt-Cr-TiO 2 and 0.3 at.% Cr-V-TiO 2 showed the highest visible light photocatalytic activity with respect to MB degradation and iodide oxidation, respectively. However, none of the codoped TiO 2 samples were found to have enhanced photocatalytic activity for phenol degradation when compared to their single-doped TiO 2 counterparts.

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Sol–gel-derived VχTi1−χO2 films and their photocatalytic activities under visible light irradiation

Cited by 77 publications

References 31 publications

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Comparative assessment of the efficiency of Fe-doped TiO₂prepared by two doping methods and photocatalytic degradation of phenol in domestic water suspensions

Combinatorial doping of TiO₂ with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

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Sol–gel-derived VχTi1−χO2 films and their photocatalytic activities under visible light irradiation

Cited by 77 publications

References 31 publications

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Comparative assessment of the efficiency of Fe-doped TiO2prepared by two doping methods and photocatalytic degradation of phenol in domestic water suspensions

Combinatorial doping of TiO2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

Contact Info

Product

Resources

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Comparative assessment of the efficiency of Fe-doped TiO₂prepared by two doping methods and photocatalytic degradation of phenol in domestic water suspensions

Combinatorial doping of TiO₂ with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation