NO removals by N-doped TiO2 photocatalysts showed effectiveness under both UV and visible light illumination. However, the result that the transformation of NO to NO3
-need to be further studied and characterized. Although the chemical structures of N-dopants in the TiO2photocatalysts have been speculated in this study and their correlations with the photoactivity have been suggested,
photocatalyst. And the actual coordination of the N-impurity can not be identified by the XPS data.
Furthermore, Livraghi et al. (2006) indicated that some of the N-induced defects are also responsible for the increased photoactivity. Therefore the simultaneous consideration of all possible factors for the photoactivity might be required. The production of a pure N-speciation in each photocatalyst to directly identify the N-dopant effect on the photocatalytic activity may be a challenge work in the future.
The APPENS process could be utilized for the purpose of either implication or application studies of TiO2 nanoparticles. Further research work can be extended to generate other chemical components of nanoparticles such as SiO2, ZnO and MgO.
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