Immobilized TiO2 and its Photocatalytic Application in Removing Nitrogen from Water

doi:10.7517/j.issn.1674-0475.2006.01.17

Abstract

Abstract: The photocatalytic nitrogen removal from water by coupling photocatalytic oxidation of ammonia and reduction of nitrite were studied, using an immobilized TiO₂ catalyst. The preparation of the catalyst films, their photocatalytic activities and effect of conditional factors(especially pH)on nitrogen removal were also investigated. Under N₂ flow, Nitrite reduction was the major reaction under acidic condition, while ammonia oxidation was the main reaction under basic condition. By adjusting the pH value of the solution using formic acid, photocatalysis carried out under acidic condition first for 0.5 h to 1 h, then under basic condition by adjusting pH, increased the overall nitrogen removal level. The result of the experiment showed that after 2 h irradiation, the removal of TN more than 50% by the photocatalytic process was achieved. The catalyst film can be used repeatedly without decline of activity. A reaction mechanism was proposed for photocatalytic nitrogen removal.

Key words: Sol-Gel, TiO₂, photocatalysis, nitrogen removal

CLC Number:

MA Hui, LIU Li-fen, YANG Feng-lin, ZHANG Xing-wen, Jimmy C. Yu. Immobilized TiO₂ and its Photocatalytic Application in Removing Nitrogen from Water[J]. Imaging Science and Photochemistry, 2006, 24(1): 17-27.

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Immobilized TiO₂ and its Photocatalytic Application in Removing Nitrogen from Water

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