Visible-light-induced photocatalytic oxidation of carboxylic acids and aldehydes over N-doped TiO2 loaded with Fe, Cu or Pt

Morikawa, Takeshi; Ohwaki, Takeshi; Suzuki, Kyohei; Moribe, Shinya; Tero‐Kubota, Shozo

doi:10.1016/j.apcatb.2008.01.034

Cited by 119 publications

(98 citation statements)

References 40 publications

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“…Some potential applications of TiO 2 have been developed including solar energy conversion 1,2 and environmental purification. [3][4][5] However, the main drawback is that TiO 2 photocatalysts may only be excited by ultraviolet (UV) light (wavelength l < 388 nm) due to their wide band gap. Therefore, the overall efficiency of TiO 2 remains too low under natural sunlight irradiation, as UV only accounts for about 4% of the incoming solar energy on the Earth's surface.…”

Section: Introductionmentioning

confidence: 99%

Preparation of highly visible-light active N-doped TiO2 photocatalyst

et al. 2010

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A series of N-doped anatase TiO 2 samples have been prepared using a solvothermal method in an organic amine/ethanol-water reaction system. The effects of different starting N : Ti atomic ratios on the catalysts structure, surface property and catalytic activity have been investigated. The photocatalytic activity and stability of the N-doped TiO 2 samples were evaluated through using the decomposition of Methylene blue (MB) and Methyl orange (MO) as model reaction under visible light irradiation. Characterization results show that the nitrogen dopant has a significant effect on the crystallite size and optical absorption of TiO 2 . It was found that the N-doped TiO 2 catalysts have enhanced absorption in the visible light region, and exhibit higher activity for photocatalytic degradation of model dyes (e.g. MB and MO). The catalyst with the highest performance was the one prepared using N : Ti molar ratio of 1.0. Electron paramagnetic resonance (EPR) measurement suggests the materials contain Ti 3+ ions, with both the degree of N doping and oxygen vacancies make contributions to the visible light absorption of TON. The presence of superoxide radicals (Ȯ À ) and hydroxyl radicals (OH) on the surface of TON were found to be responsible for MB and MO solution decoloration under visible light. Based on the results of the present study, a visible light induced photocatalytic mechanism has been proposed for N-doped anatase TiO 2 .

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Section: Introductionmentioning

confidence: 99%

Preparation of highly visible-light active N-doped TiO2 photocatalyst

et al. 2010

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“…The one method is intentionally to use effectively the longer wavelength light. [12][13][14][15][16][17] N-doped TiO2 films were used in some cases. 12,13 Mainly TiO2 films were used.…”

Section: -22mentioning

confidence: 99%

Co-catalyitic effect on improving the photocatalytic properties of TiO<sub>2</sub> films

Isai

Nakamura

Hieda

et al. 2013

Trans. Mat. Res. Soc. Japan

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TiO2 films were prepared by RF magnetron sputtering method. Cu and Fe films were loaded on the TiO2 films by ion coater to improve the photocatalytic properties. The organic-decomposition properties could be improved by the photocatalytic activity of these materials. An optimum thickness of each material was examined through this study. The highest photocatalytic properties for Cu and Fe loaded films were obtained at the thicknesses of 600 and 141 Å, respectively. In the case of hydrophilicity, the contact angles of the Cu and Fe-deposited films are 3 and 5 degrees, respectively after 1hour-UV irradiation. The organic-decomposition properties could be improved without deteriorating the hydrophilicity.

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“…[8][9][10] The use of solar energy has been highlighted as an alternative to obtain clean energy while simultaneously reducing the CO 2 concentration in the atmosphere. 11 Many chemicals are reported to be produced from water and CO 2 : formic acid, 12,13 acetic acid, 14,15 formaldehyde, 16 methanol [17][18][19] and methane. 20,21 Using a combination of metaloxides and co-catalysts we have already demonstrated the feasibility to produce both methane and methanol.…”

Section: Introductionmentioning

confidence: 99%

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Januario

Nogueira

Pastore

2018

J. Braz. Chem. Soc.

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Photocatalytic reactions to convert CO 2 and H 2 O into solar fuels using only solar irradiation have been investigated in this work. For this purpose, titanosilicate ETS-10 was decorated with Cu 2 O and CuO nanoparticles and their properties were analyzed by different techniques. The final materials were applied in photoreduction of CO 2 in gas phase under 20 h of solar irradiation. In the final, the products oxygen, acetic acid, formaldehyde and methanol were detected by chromatographic techniques. Photoluminescence and electrochemical studies indicate the interaction between Cu x O nanoparticles and Ti-O-Ti-O on the surface of ETS-10, corroborating with the results obtained in the photocatalytic experiments. The best CO 2 photoconversion efficiencies into methanol were obtained when using ETS-10/Cu x O compared to pure ETS-10. Another important finding in this study is the fact that the reactions were carried out in the gas phase and no scavenge donors were employed.Keywords: CO 2 photoreduction, ETS-10 photocatalyst, oxygenated products, copper oxide, solar irradiation IntroductionIn the last 40 years, CO 2 emissions from fossil fuel combustion and industrial processes contributed with about 78% of the total greenhouse gases (GHG) emissions. 1 Different methods to consume CO 2 have been investigated, such as thermochemical conversion, 2-4 electrochemical reduction, [5][6][7] and photocatalytic reduction of CO 2 and water into hydrocarbons or solar fuels. [8][9][10] The use of solar energy has been highlighted as an alternative to obtain clean energy while simultaneously reducing the CO 2 concentration in the atmosphere. 11 Many chemicals are reported to be produced from water and CO 2 : formic acid, 12,13 acetic acid, 14,15 formaldehyde, 16 methanol [17][18][19] and methane. 20,21 Using a combination of metaloxides and co-catalysts we have already demonstrated the feasibility to produce both methane and methanol. 22 The first and principal step in CO 2 reduction is the oxidation of H 2 O molecules into oxygen and protons (equation 1), following the sequence described in equations 1-5. 23 Several works report the conversion to oxygenated chemicals by using sacrificial compounds, such as NaOH, 24 Titanosilicate ETS-10 (Engelhard titanium silicate) was first reported in the literature by Chapman and Roe 28 in 1990, however its structure was elucidated only in 1994 by Anderson et al. 29 using sophisticated techniques as highresolution transmission electron microscopy (HRTEM), nuclear magnetic resonance (NMR) and molecular simulations. The most interesting feature is that the ETS-10 contains a periodic structure of quantum semiconductor wires of [-O-Ti-O-Ti-] formed by TiO 6 octahedra isolated along the structure. The pores (ca. 0.67 nm diameter) run along [100] and [010] directions. [30][31][32][33] These properties make ETS-10 unique, because a short Ti-O bond length (1.71-2.11 Å) along the axial direction would not be possible outside of a zeolite framework. 34 This material absorbs ETS-10 Modified with Cu ...

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Visible-light-induced photocatalytic oxidation of carboxylic acids and aldehydes over N-doped TiO2 loaded with Fe, Cu or Pt

Cited by 119 publications

References 40 publications

Preparation of highly visible-light active N-doped TiO2 photocatalyst

Preparation of highly visible-light active N-doped TiO2 photocatalyst

Co-catalyitic effect on improving the photocatalytic properties of TiO<sub>2</sub> films

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

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