Influence of crystallinity and carbon content on visible light photocatalysis of carbon doped titania thin films

Wong, Ming‐Show; Hsu, Shih-Wei; Rao, K. Koteswara; Kumar, Chinthala Praveen

doi:10.1016/j.molcata.2007.09.024

Cited by 95 publications

(41 citation statements)

References 20 publications

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“…However, it is active only in the ultraviolet (UV) region because of its wide band gap (3.0-3.2 eV), which accounts for less than 5% of solar energy [3]. Recent studies have revealed that the shortcoming of TiO 2 can be overcome by doping the nonmetal elements such as nitrogen [4][5][6], boron [7], sulfur [8], carbon [9], etc. For example, Asahi et al [4] reported that N-doped TiO 2 showed photocatalytic activity for the decomposition of acetone and methylene blue in wavelengths up to 550 nm because the N 2p states contribute to the band gap narrowing by mixing with O 2p states by substitutional doping of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Liu

Qin

Zuo

et al. 2009

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Liu

Qin

Zuo

et al. 2009

Journal of Hazardous Materials

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“…Nevertheless, the impurity energy level located at Fermi level is deep in band gap, and when C doping concentration is high enough it may become an effective carriers recombination center, this may be one reason for the existence of optimal C doping concentration [24].…”

Section: Resultsmentioning

confidence: 99%

First Principles Study on the Electronic Structure and Optical Property of Nd-C Codoped Anatase TiO 2

Tian

Zheng

2016

Matéria (Rio J.)

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Band structures, density of states, and absorption spectra of pure, Nd doped, C doped, and Nd-C codoped TiO 2 are calculated using first-principles based on density functional theory. Calculation results show that Nd 4f state forms empty impurity energy levels below conduction band, and C 2p state together with Nd 2f state forms occupied impurity energy levels with higher density than that of single doped TiO 2 above valence band. Consequently, more electrons in occupied energy levels can be excited by visible light to empty Nd 4f states rather than Ti 3d states, resulting in further enhancement of visible light absorption and absorption edge red shift. In addition, the impurity energy levels act as carriers trap centers, thus decreasing the recombination rate of carriers.

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“…On the other hand, the photocatalytic response of the tested cement plates should be also related with the carbon content in N,C-TiO 2 photocatalysts. Wong et al [40] discussed the enhancement of the photoactivity of the TiO 2 -C film as the influence of carbon content and crystallinity of the carbon-modified TiO 2 materials. The best results were obtained for TiO 2 -C film with an optimal carbon content.…”

Section: Photocatalyst Characteristicsmentioning

confidence: 99%

Induced self-cleaning properties towards Reactive Red 198 of the cement materials loaded with co-modified TiO2/N,C photocatalysts

Janus

Bubacz

Zatorska

et al. 2014

Reac Kinet Mech Cat

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The possibility of promoting the self-cleaning properties of the cement materials was verified by implementing the obtained nitrogen and carbon comodified titania-based (TiO 2 /N,C) photocatalysts into the cement plates. Additionally, unmodified TiO 2 (Grupa Azoty Zakłady Chemiczne POLICE S.A., Poland) and a commercial photocatalyst P25 (Evonik Industries AG, Germany) were used as reference materials. The impact of treatment temperature on the physicochemical properties of the obtained TiO 2 /N,C additives was discussed. The photocatalytic activity of the prepared cement plates was evaluated trough the degradation of a model organic compound (Reactive Red 198) under UV-vis light. It was found that cement plates containing TiO 2 /N,C photocatalyst calcined at 600°C temperature exhibited the highest photocatalytic activity. The role of several factors such as crystallinity, phase composition and non-metals presence in the TiO 2 /N,C additives on the self-clearing properties of the cement samples was also included in the discussion.

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Influence of crystallinity and carbon content on visible light photocatalysis of carbon doped titania thin films

Cited by 95 publications

References 20 publications

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

Solvothermal-induced phase transition and visible photocatalytic activity of nitrogen-doped titania

First Principles Study on the Electronic Structure and Optical Property of Nd-C Codoped Anatase TiO 2

Induced self-cleaning properties towards Reactive Red 198 of the cement materials loaded with co-modified TiO2/N,C photocatalysts

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