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Nitrogen-doped yellowish rutile titania prepared by high energy ball milling of P-25 titania - 5% HMT (Hexamethylenetetramine, C6H12N4) mixed powders followed by calcination in air at 400 °C possessed two absorption edges around 400 and 540 nm and showed excellent photocatalytic ability for nitrogen monoxide oxidization under irradiation of the visible light of wavelength >510 nm.
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Yin et al. (2003) studied this question.
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