关键词: 氮掺杂, 二氧化钛, 含氮污染物, 可见光催化

Abstract:

Objective: To investigate the degradation activity of nitrogen-doped titanium dioxide to the Nitrogen pollutants with
visible light photocatalysis. Methods: Nitrogen- doped titanium oxides（N- TiO₂）with different amounts of N were prepared via hydrothermal method by using thiourea as nitrogen source. The structure and morphology of N-TiO₂ were characterized by X-ray powder diffraction（XRD）and transmission electron microscopy（TEM）respectively. The visible light photocatalysis activities of the N-TiO₂ series samples were evaluated by the degradation of rhodamine B in aqueous solution, and the nitrogen pollutant degradation activity of the optimum N-TiO₂ on the nitrogen pollutants were explored by using acephate as the nitrogen model pollutant. Results:The visible light photocatalysis activity of TiO₂ was enhanced when appropriate amount nitrogen was doped into TiO₂, and 1.0% N-TiO2 showed the highest visible light photocatalysis activity. The total nitrogen can be degraded from class Ⅳ water quality to class Ⅱ water quality after 4 hours' visible light irradiation using 1.0% N-TiO₂ as the photocatalyst. Conclusion: Nitrogen-doped titanium oxide can degrade nitrogen pollutants in water effectively under visible light irradiation.

Key words: nitrogen-doped, titanium oxide, nitrogen pollutant, visible light photocatalysis