Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO2 and Photocatalysis

doi:10.7517/j.issn.1674-0475.2006.04.291

Abstract

Abstract: Highly active Ag/TiO₂ photocatalyst was prepared using a photocatalytic reduction method and was characterized with XRF,TEM and XRD,XPS and UV-Vis.Effects of conditional factors such as Ag doping,photo-reduction time,stirring gas and addition of Fe²⁺ on the activity of photocatalyst in nitrogen removal from water by coupled ammonia oxidation and nitrite reduction were investigated.Results showed that nitrite reduction rate and the nitrogen removal rate were highest with 1.0% Ag doping.Also,reduction was ineffective without sufficient irradiation during photocatalyst preparation,the photocatalyst activity was enhanced under protection of nitrogen and addition of Fe²⁺ increased photocatalytic reduction of nitrite.2 h photocatalytic reaction reduced the total nitrogen by 63.9% for water samples with both ammonia and nitrite.

Key words: Ag/TiO₂, photocatalysis, ammonia, nitrite

CLC Number:

LIU Li-fen, LI Xiu-ting, YANG Feng-lin, Jimmy C Yu. Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO₂ and Photocatalysis[J]. Imaging Science and Photochemistry, 2006, 24(4): 291-300.

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Nitrogen Removal via Ammonia Oxidation and Nitrite Reduction Using Ag/TiO₂ and Photocatalysis

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