Titanium dioxide and its modified forms as photocatalysts for air treatment
Journal article
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Strategic Research Themes
Publication Details
Author list: Muangmora R., Kemacheevakul P., Chuangchote S.
Publisher: Bentham Science Publishers
Publication year: 2021
Volume number: 17
Issue number: 2
Start page: 185
End page: 201
Number of pages: 17
ISSN: 1573-4110
eISSN: 1875-6727
Languages: English-Great Britain (EN-GB)
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Abstract
Background: TiO2 has been proved as an effective photocatalyst for air purification that can produce hydroxyl radicals and superoxide radicals by the illumination of light with suitable ener-gy. These radicals are extremely powerful agents in the degradation of gaseous pollutants. A major drawback of TiO2 is its wide energy band gaps of 3.2 and 3.0 eV for anatase and rutile phases, re-spectively, which are mostly equivalent to the photon wavelength absorption in the range of UV region. Methods: The modification strategies of TiO2 as photocatalysts for air treatment, such as metal dop-ing, non-metal doping, co-doping, and coupling with other semiconductors are discussed. The photo-catalytic performance of the pristine TiO2 and modified TiO2 for degradations of gaseous pollutants are reviewed. Results: Various parameters can affect the photocatalytic removal efficiencies of gaseous pollutants, such as the initial concentration of pollutants, relative humidity, light source, irradiation time, and the preparation of TiO2 photocatalysts. The optimal content of dopants and the combined-semiconductors should be considered for preventing the recombination of electrons and holes during irradiation. Conclusion: Doping with heteroatoms and coupling could enhance the photocatalytic activity of TiO2. The modified photocatalysts could be applied for photocatalytic degradation of gaseous pollu-tants, including volatile organic compounds (VOCs), nitrogen oxides (NOx), and sulfur oxides (SOx). © 2021 Bentham Science Publishers.
Keywords
Air treatment, Coupling, Gaseous pollutants
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