Photocatalytic degradation of trichloroethylene using N-doped TiO2 prepared by a simple sol–gel process

Yokosuka, Yuta; Oki, Kyoichi; Nishikiori, Hiromasa; Tatsumi, Yukichi; Tanaka, Nobuaki; Fujii, Tsuneo

doi:10.1007/s11164-008-0019-z

Cited by 59 publications

(41 citation statements)

References 31 publications

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“…These results indicate that the amount of nitric acid affected the particle size and crystallization of During irradiation with visible light, TCE was degraded and CO, CO 2 , HCl, and COCl 2 were generated, similarly to during UV irradiation. However, no DCAC was found in this case, similar to results reported elsewhere [5,20].…”

Section: Mechanism Of Nitrogen Dopingsupporting

confidence: 92%

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Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

et al. 2011

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N-doped TiO 2 has been prepared by use of sol-gel systems containing titanium alkoxide, with nitric acid as the nitrogen source.The time needed for gelation of the systems was drastically reduced by ultrasonic irradiation. The peaks assigned to the nitrate and nitrous ions were observed by FT-IR measurement during the sol-gel reaction. The N-doping was confirmed by observation of N-O peaks in the XPS spectrum of the sample heated at 400 °C.The nitrate ion acted as an oxidizer of the ethanol solvent and titanium species. The TiO 2 became doped with nitrogen oxide species were doped as a result of reduction of nitrate ion incorporated into the dried gel samples. These results indicated that the added nitric acid was reduced during the sol-gel transition and heating process, and the resulting NO species were situated in the titania networks. The UV and visible photocatalytic activity of the samples was confirmed by the degradation of trichloroethylene.

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Section: Mechanism Of Nitrogen Dopingsupporting

confidence: 92%

“…We have prepared N-doped TiO 2 by the sol-gel method using a large amount of nitric acid as the source of nitrogen [20] as Dong et al previously reported [21]. A large amount of nitric acid was required because most of it was evaporated during the heating process.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

et al. 2011

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“…During the visible irradiation, TCE was degraded and CO, CO 2 , HCl, and COCl 2 were generated as well as during the UV irradiation. However, no DCAC was found in this case similar to the results reported in a previous paper [34,44].…”

Section: Photocatalytic Degradation Of Tce During Uv and Visible Irrasupporting

confidence: 91%

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

et al. 2011

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Cu-doped TiO 2 was prepared by the refluxing of a mixture of copper and titanium alkoxides. The refluxing improved the Cu 2+ dispersion in the TiO 2 and formed effective Ti-O-Cu bonds. The impurity states due to the highly dispersed Cu 2+ were presumed to trap the electrons in the conduction band of the TiO 2 and prevent charge recombination of the electrons and holes. Consequently, the prolonged charge separation duration was suggested to enhance the photocatalytic activity of the Cu-doped TiO 2 . This enhancement was confirmed by the hydroxyl radical generation and organic compound degradation. The Ti-O-Cu bonds and electronic interaction between Cu and Ti should effectively promote the electron trapping.The Cu-doped TiO 2 exhibited a visible light-induced activity due to the transition from the TiO 2 valence band to the Cu 2+ impurity states.

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“…On the other hand, we prepared the N-doped TiO 2 by the sol-gel method using a large amount of nitric acid as the nitrogen source [10,11] as Dong et al previously reported [12]. A large amount of nitric acid was required because most of it evaporated during the heating process.…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Photocatalytic Activity of Sulfate-Doped Titanium Dioxide Prepared by the Sol−Gel Method

2013

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Sulfate-doped TiO 2 was prepared from sol−gel systems containing titanium alkoxide and sulfuric acid. The time needed for gelation of the systems was significantly reduced by ultrasonic irradiation. The doped sulfate was observed by FTIR and XPS measurements. Some sulfate ions remained in the TiO 2 even after heating at 300−600 °C. The UV and visible photocatalytic activities of the samples were confirmed by the degradation of trichloroethylene (TCE). The activity of the photocatalyst samples during the UV irradiation strongly depended on their crystallinities rather than their specific surface areas, i.e., adsorption ability. The degradation rate during the visible irradiation depended on both the adsorption ability and visible absorption of the photocatalyst samples. The visible absorption induced by the sulfate-doping was effective for the TCE degradation.

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Photocatalytic degradation of trichloroethylene using N-doped TiO2 prepared by a simple sol–gel process

Cited by 59 publications

References 31 publications

Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

Visible Light-Photocatalytic Activity of Sulfate-Doped Titanium Dioxide Prepared by the Sol−Gel Method

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