Simultaneous photocatalytic removal of ammonium and nitrite in water using Ce3+-Ag+ modified TiO2
Yu, Jimmy C.
|Source||Separation and purification technology , v. 67, (2, Sp. Iss. SI), 2009, JUN 2, p. 244-248|
|Summary||Simultaneous photocatalytic removal of both ammonium and nitrite from water via coupled oxidation and reduction for N-2 formation was studied, using TiO2 loaded with different ratios of Ce3+ and Ag+. The catalysts were prepared using a sol-gel method with PEG or P123 as soft template. The catalysts with the highest activity (cerium and silver loading both at 0.1\%) in N removal were characterized by TEM, XRD and UV-vis spectra. The crystalline TiO2 was mainly anatase type, its size averaged at 8.8-9.6 nm. Contents of Ce and Ag and ratios of ammonium to nitrite (NH4-N/NO2--N) in the reaction solution affected either the catalyst activity or the nitrogen removal efficiency. The best removal rates were 69.9\% NH4+-N, simultaneously 59.9\% NO2--N, and 64.9\% TN (total nitrogen) in annular reactor, after 2 h UV (254 nm, 20 W) irradiation when ratio of NH4-N/NO2--N was 1. Using solar light, the same solution after 2 h reaction using the same Ce and Ag co-modified TiO2, removal of NH4-N, NO2-N and TN was 44.8\%, 45.3\% and 45.1\% respectively using a tubular reactor. (c) 2009 Elsevier B.V. All rights reserved.|
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