Enhancement of atrazine degradation by oxygen in UV/Fe3+ process
The degradation of atrazine in various photochemical processes (UV/N2, UV/air, UV/Fe 3+ /N2 and UV/Fe 3+ /air) was compared. The degradation of atrazine in these processes all fitted the pseudo-first-order kinetic well. The process exhibiting the highest kinetic constant was UV/Fe 3+ /air process, of which kinetic constant was about 1.47, 2.23 and 2.56 times of that of UV/Fe 3+ /N2, UV/air and UV/N2 processes,respectively. In the presence of oxygen, the degradation of atrazine in the photocatalytic process (UV/Fe 3+ ) was greatly enhanced. The detection of Fe 3+ during the process demonstrated that the simultaneous oxidation of Fe 2+ to Fe 3+ happened in UV/Fe 3+ /air process, which resulted in the enhancement of atrazine degradation. The mechanism of Fe 2+ oxidation in UV/Fe 3+ /air process was proposed on the basis of the experimental data. In the illumination of UV, the electron transferred from the excitation state of atrazine to the dissolved oxygen to form O2 -(°). In the case of acidic solution of pH=3, O2 -(°) was readily to combine with H + to form the hydroperoxyl radical (HO2(°) ). HO2(°) preferred to oxidized Fe 2+ to regenerate Fe 3+ and in consequence,the production of (°)OH and the degradation of atrazine were enhanced.
atrazine UV/Fe 3+ oxygen enhancement
YINGXUN DU LECHENG LEI FANGMING JIN
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science & En Institute of Environmental Pollution Control Technologies, Xixi Campus, Zhejiang University, Hangzho
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）