Removing Ammonia Nitrogen from Water Using CdS/TiO2 Photocatalyst

doi:10.7517/j.issn.1674-0475.2007.02.89

Abstract

Abstract: CdS/TiO₂ composite photocatalysts were prepared by using a sol-gel method.The catalysts were tested in removing ammonia pollutant in water by photocatalysis under the illumination of different light sources (UV,solar light,fluorescent lamp,indoor natural light).The effects of the CdS to TiO₂ ratio,catalyst concentration,addition of nitrite/nitrate on ammonium removal were also investigated.The test results showed that the optimum ratio of n(CdS)to n(TiO₂) is 0.17:1,with 50 mg/L ammonium in water,the removal of NH₄-N reaches 41.5% after 2 hours of irradiation.When purged with nitrogen gas,both ammonium nitrogen and nitrate/nitrite can be simultaneously removed.It is concluded that the ratio of n(CdS):n(TiO₂) is important for the synergetic photocatalytic activity and the extent of photo-corrosion of CdS was reduced in the mixed composite catalyst CdS/TiO₂.

Key words: sol-gel, ammonia nitrogen, TiO₂, CdS, photo-corrosion

CLC Number:

CHEN Xiao-hui, LIU Li-fen, YANG Feng-lin, ZHANG Xing-wen, YU Jimmy C. Removing Ammonia Nitrogen from Water Using CdS/TiO₂ Photocatalyst[J]. Imaging Science and Photochemistry, 2007, 25(2): 89-101.

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Removing Ammonia Nitrogen from Water Using CdS/TiO₂ Photocatalyst

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