(a) Several nitrogen-doped TiO2 samples (Fig. 10)7 were found to photodegrade gaseous formaldehyde,8 acetaldehyde,8,9 acetone,10 2-propanol,11,12 toluene,8,13 and methylene blue |
(a) Pure TiO2 photocatalyst is usually less effective for photo depletion of methylene blue39
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(b) TiO2xNx (films and powders) has better photoactivity than TiO2 under visible light irradiation29 due to higher surface acidity (Fig. 10)29,30
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(b) TiO2 has less photocatalytic activity under visible light irradiation |
(c) The active wavelength of TiO2xNx, of less than 500 nm covers the main peak of the solar irradiation energy beyond the Earth's atmosphere (around 460 nm)9
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(c) A similar active wavelength of 500 nm for TiO2 does not cover the main peak of the solar irradiation energy beyond Earth's atmosphere9
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(d) Introduction of ZrO2 into TiO2xNx exhibited higher porosity, higher specific surface area, and an enhanced thermal stability14
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(d) This feature was absent in TiO2
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(e) Decreases the deactivation of the photocatalysts28
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(e) Deactivation of the surface occurs very quickly |