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. 2018 Oct 4;8(58):33551–33563. doi: 10.1039/c8ra05117h

Comparison of the differences between doped TiO2xNx and TiO2 photocatalysts (Fig. 10).

Doped TiO2xNx photocatalyst TiO2 photocatalyst
(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
(b) TiO2xNx (films and powders) has better photoactivity than TiO2 under visible light irradiation29 due to higher surface acidity (Fig. 10)29,30 (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 (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
(d) Introduction of ZrO2 into TiO2xNx exhibited higher porosity, higher specific surface area, and an enhanced thermal stability14 (d) This feature was absent in TiO2
(e) Decreases the deactivation of the photocatalysts28 (e) Deactivation of the surface occurs very quickly