Carbon-doped Anatase TiO2 Powders as a Visible-light Sensitive Photocatalyst

Irie, Hiroshi; Watanabe, Yuka; Hashimoto, Kazuhito

doi:10.1246/cl.2003.772

Cited by 919 publications

(541 citation statements)

References 13 publications

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“…Carbon-doping has been reported to enhance the photoactivity of TiO 2 [8,9,25]. This is supported by the observation made earlier about higher dopant content resulting in higher photocurrent density.…”

Section: Photocurrent Density Measurementssupporting

confidence: 63%

Evaluation of microwave plasma oxidation treatments for the fabrication of photoactive un-doped and carbon-doped TiO2 coatings

Dang

Rahman

MacElroy

et al. 2012

Surface and Coatings Technology

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The photoactivity of both un-doped and carbon-doped titanium dioxide (TiO 2 ) coatings has been widely reported. In this paper, the use of a microwave plasma as a novel oxidation treatment for the fabrication of these coatings is evaluated. The photoactivity performance of the microwave plasma-formed coatings is benchmarked against those fabricated through air furnace oxidation as well as those deposited using reactive magnetron sputtering. The un-doped and carbon-doped TiO 2 coatings were prepared respectively by microwave plasma-oxidizing titanium metal sheets and sputter deposited titanium carbide thin films. The resulting oxides were characterized using XPS, XRD, FEG-SEM, and optical profilometry. The oxide layer thicknesses achieved over the 15 to 45 minute oxidation times were in the range of 0.15 to 3.44 µm. These coatings were considerably thicker than those obtained by air furnace oxidation. The microwave plasma-formed oxides also exhibited significantly higher surface roughness values compared with the magnetron-sputtered coatings. The photoactivity performance of both un-doped and carbon-doped coatings was assessed using photocurrent density measurements. Comparing the un-doped TiO 2 coatings, it was observed that those obtained using the microwave plasma oxidation route yielded photocurrent density measurements that were 4.3 times higher than the TiO 2 coatings of the same thickness that were deposited by sputtering. The microwave plasmaoxidized titanium carbide coatings did not perform as well as the un-doped TiO 2 probably due to the presence of un-oxidized carbide in the coatings, which reduced their photoactivity.

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Section: Photocurrent Density Measurementssupporting

confidence: 63%

Evaluation of microwave plasma oxidation treatments for the fabrication of photoactive un-doped and carbon-doped TiO2 coatings

Dang

Rahman

MacElroy

et al. 2012

Surface and Coatings Technology

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“…These studies showed that carbon addition to TiO 2 lowered the band gap and make them active under irradiation with visible light. Spray pyrolysis of Ti with carbonaceous precursors (43)(44)(45) and oxidation of TiC (46)(47)(48)(49) can be also applied for preparation of TiO 2 modified by carbon. In the previous studies researches revealed (45) that C doping decreased the energy band gap of TiO 2 from 3.2 to 2.78 eV and created a new energy band located above the valence band with energy of 1.45 eV.…”

Section: Introductionmentioning

confidence: 99%

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

Kusiak-Nejman¹,

Wanag²,

Kowalczyk³

et al. 2015

Journal of Advanced Oxidation Technologies

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Abstract:In this study a photocatalytic performance of new carbon-modified titanium dioxide photocatalysts was discussed. Benzene was used as carbon precursor. It was found that the photocatalytic activity of obtained samples increases with the increase of modification temperature and decrease of carbon concentration present in TiO 2 /C samples. This could be related to the kind of interactions between TiO 2 surface and carbon from thermal decomposition of benzene. The higher calcination temperature the less carbon deposits on the surface of modified samples and the higher probability of the Ti and C interaction confirmed by means of UV-vis/DR studies. It was proved that the photocatalytic activity of carbon modified titania nanomaterials strongly depends on carbon content in TiO 2 /C photocatalysts. Modification of starting TiO 2 with benzene is a promising method especially by taking into account the mineralization of phenol and the co-products of its degradation.

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“…[27] Depending on its source, carbon can be displayed either as a substitutional anion or as an interstitial cation. [28,29] In the former case, Ti-C bond is observed, while in the latter one C-O (carbonate) bond is more likely. [30,31] Nonetheless, Kirsh et al reported that carbon efficiency is not due to a modification of titania lattice, but carbon species, differently from nitrogen, act as sensitizers, injecting electrons from the dopant to the conduction band of titania.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

et al. 2017

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Global society is constantly seeking for sustainable and effective processes to fight environmental pollution. The abatement\ud of NO, a class of hazardous contaminants, can be performed by means of photocatalytic oxidation using titaniabased photocatalysts. Non-metal doping is highly desirable for an efficient exploitation of solar light. The co-presence of nitrogen and carbon represents an appealing possibility though their introduction generally requires post-synthesis treatments. Otherwise, in this work carbon and nitrogen have been introduced in titania photocatalysts simultaneously by a onepot synthetic approach using a natural and sustainable source of dopants, namely chitosan. Several synthetic parameters have been changed in order to evaluate their effect on the physicochemical properties of the final materials and to establish structure-activity relationship as for the photocatalytic performances in NOx oxidation under visible light irradiation

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Carbon-doped Anatase TiO2 Powders as a Visible-light Sensitive Photocatalyst

Cited by 919 publications

References 13 publications

Evaluation of microwave plasma oxidation treatments for the fabrication of photoactive un-doped and carbon-doped TiO2 coatings

Evaluation of microwave plasma oxidation treatments for the fabrication of photoactive un-doped and carbon-doped TiO2 coatings

The Photocatalytic Performance of Benzene- Modified TiO2 Photocatalysts under UV-vis Light Irradiation

Tuning the Synthetic Parameters to Obtain Smart C‐N Co‐Doped Titania Photocatalysts for NOx Abatement

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