期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 42, 期 15, 页码 5548-5554出版社
AMER CHEMICAL SOC
DOI: 10.1021/es703143g
关键词
-
Several groups of popular antibacterial agents (i.e., phenols, fluoroquinolones, aromatic N-oxides, and tetracyclines) were demonstrated in earlier studies to be highly susceptible to oxidation by manganese oxides, a common oxidant in soils. However, because of the high complexity, the reaction kinetics were not fully characterized. A mechanism-based kinetic model has now been developed to successfully describe the entire rang-e of kinetic data for a total of 21 compounds of varying structural characteristics (with R-2 > 0.93). The model characterizes the reaction kinetics by two independent parameters, the reaction rate constant W and total reactive surface sites (S.). The model fitting indicates that the reaction kinetics of antibacterials with MnO2 are controlled by either the rate of surface precursor complex formation (for tetracyclines) or by the rate of electron transfer within the precursor complex (for phenols, fluoroquinolones, and aromatic N-oxides). The effect of reactant concentration, pH, and cosolutes on the reaction kinetics was evaluated and correlated to kand S-rxn. All the trends are consistent with the proposed rate-limiting steps. This new model improves the ability to quantitatively evaluate the kinetics of oxidative transformation of organic contaminants by manganese oxides in well-defined systems.
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