Study on Photocatalytic Activity of TiO2 Photocatalysts Doped with Metal Ions in Nitrogen Removal

doi:10.7517/j.issn.1674-0475.2007.03.165

Abstract

Abstract: Titanium dioxide photo-catalysts doped/co-doped with Ce³⁺,La³⁺/Ag⁺/Fe³⁺ by using the sol-gel method were prepared and tested to evaluate their photo-catalytic activities on nitrogen removal from solution which contained ammonium and nitrite.The catalysts were characterized using UV-Vis,XRD and TEM.Also investigated were the influencing factors such as different kinds and concentration of doped metal ion,dipping times (thickness of catalyst films),addition of Fe²⁺ to the solution,different substrate (glass or stainless steel net),different designs of reactor and different light sources (UV or solar light) on photocatalytic N removal efficiency.After 2 hours UV irradiation,simultaneous removal of ammonium and nitrite could be achieved.The removal efficiency for TN was about 30% when TiO₂ film was used.A higher removal rate of 41.7% could be achieved by using TiO₂ powders.

Key words: TiO₂, photo-catalysis, transition metal ion doping, nitrogen removal

CLC Number:

LIU Li-fen, ZHANG Yang, YANG Feng-lin, Jimmy C YU. Study on Photocatalytic Activity of TiO₂ Photocatalysts Doped with Metal Ions in Nitrogen Removal[J]. Imaging Science and Photochemistry, 2007, 25(3): 165-175.

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Study on Photocatalytic Activity of TiO₂ Photocatalysts Doped with Metal Ions in Nitrogen Removal

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