期刊
CHEMOSPHERE
卷 74, 期 11, 页码 1444-1449出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2008.12.012
关键词
Linuron; Photolysis; Ozone; Rate constants; Model
资金
- Hong Kong Polytechnic University
The degradation of linuron, one of phenylurea herbicides, was investigated for its reaction kinetics by different treatment processes including ultraviolet irradiation (UV), ozonation (O-3), and UV/O-3. The decay rate of linuron by UV/O-3 process was found to be around 3.5 times and 2.5 times faster than sole-UV and ozone-alone, respectively. Experimental results also indicate overall rate constants increased exponentially with pH above 9.0 while the increase of rate constants with pH below 9 is insignificant in O-3 system. All dominant parameters involved in the three processes were determined in the assistant of proposed linear models in this study. The approach was found useful in predicting the process performances through the quantification of quantum yield (phi(LNR)), k(OOH) (rate constant for the formation of free radical HOO center dot- from ozone decomposition at high pH), rate constant of linuron with ozone (k(O3,LNR)), rate constant of linuron with hydroxyl radical (k(OH,LNR)), and alpha (the ratio of the production rate of OH center dot and the decay rate of ozone in UV/O-3 system). (C) 2008 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据