Abstract

Nitrogen-doped nano-scale TiO₂ was prepared by microwave-assisted process at low temperature with Ti(SO₄)₂ as raw material, and ammonia water as precipitant and nitrogen source. The obtained powder was characterized by XRD, XPS, UV-Vis diffuse reflection spectroscopy, TEM and etc. Its photocatalytic activity under UV light was evaluated with methyl orange solution as target contaminant. The results from XRD analysis showed that the titled TiO₂ existed in an anatase phase. The particle size read from XRD was 5~10 nm, in general accordance with that from TEM. XPS analysis exhibited an N1s peak around 399 eV, which indicated an N-Ti-O structure in TiO₂. UV-Vis diffuse reflection spectroscopy exhibited a red shift of the absorption edge, which indicated that the sample had a certain absorption of visible light at 400~500 nm. The results of photocatalysis experiment proved that the titled TiO₂ has a higher photocatalytic activity.

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