Heterogeneous ozonation kinetics of polycyclic aromatic hydrocarbons on organic films
Heterogeneous ozonation kinetics of polycyclic aromatic hydrocarbons on organic films
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DOI：
10.1016/j.atmosenv.2006.02.004
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发表时间：
2006-06-01
影响因子：
5
通讯作者：
Donaldson, D. J.
中科院分区：
文献类型：
--
作者：
Kahan, T. F.;Kwamena, N. -O. A.;Donaldson, D. J.
在臭氧浓度从3.5 × 10（14）到2.3 × 10（16）分子厘米（-3）的范围内，测量了气相臭氧与萘、蒽、荧光蒽、菲、芘和苯并[a]芘的室温非均相反应速率。多环芳烃（PAHs）溶解在辛醇或癸醇组成的有机混合物中，以及已知存在于“城市污垢”薄膜中的化合物的代用物。在所有情况下，反应动力学都被Langmuir-Hinshelwood机制很好地描述，这表明是表面反应。通过蒽的吸附等温线证实了多环芳烃在空气-有机界面上的吸附作用。附加有机化合物的存在一般不影响反应速率；然而，油酸和角鲨烯等不饱和物质显著降低了观察到的速率。(c) 2006 Elsevier Ltd.版权所有。
The room temperature heterogeneous reaction rates of gas-phase ozone with naphthalene, anthracene, fluoranthene, phenanthrene, pyrene, and benzo[a]pyrene were measured over a range of ozone concentrations from 3.5 x 10(14) to 2.3 x 10(16) molec.cm(-3). The polycyclic aromatic hydrocarbons (PAHs) were dissolved in organic mixtures composed of octanol or decanol along with proxies for compounds known to be present in "urban grime" films. In all cases, the reaction kinetics were well-described by the Langmuir-Hinshelwood mechanism, which suggests a surface reaction. The adsorption of PAHs to the air-organic interface was confirmed by an adsorption isotherm of anthracene. The presence of the additional organic compounds generally did not affect the reaction rates; however, unsaturated species such as oleic acid and squalene reduced the observed rates significantly. (c) 2006 Elsevier Ltd. All rights reserved.