期刊
CHEMOSPHERE
卷 53, 期 1, 页码 1-7出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0045-6535(03)00388-6
关键词
advanced oxidation processes; nitroaromatic compounds; hydroxyl radical; competitive kinetics; Hammett equation
The rate constants for hydroxyl radical reaction toward a set of nitroaromatic substrates k(S), have been measured at 25 degreesC using competition experiments in the UV/H2O2 process. For a given pair of substrates S-1 and S-2, the relative reactivity beta (defined as k(S1)/k(S2)) was calculated from the slope of the corresponding double logarithmic plot, i.e., of ln[S-1] vs. ln[S-2]. This method is more accurate and remained linear for larger conversions in comparison with the plots of ln[S-1] and ln[S-2] against time. The rate constants measured ranged from 0.33 to 8.6 x 10(9) M-1 s(-1). A quantitative structure-reactivity relationship was found using the Hammett equation. Assuming sigma values to be additive, a value of -0.60 was obtained for the reaction constant rho. This value agrees with the high reactivity and the electrophilic nature of HO. radical. (C) 2003 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