文档介绍：光化学降解汽车尾气中的多环芳烃污染物的研究
摘要
多环芳烃(PAHs)是指含有两个或两个以上苯环,以线状、角状或簇状排列的稠环型化合物。具有难降解性、持久性和“三致”作用,其环境行为、归趋及风险评估越来越受到人们的重视。多环芳烃(PAHs)是环境中普遍存在的有机污染物。环境中PAHs的来源分为天然源和人为源。汽车尾气排放是城市大气PAHs污染的主要人为源之一。国内外研究人员都逐渐着手对PAHS进行研究。本文还介绍了多环芳烃的种类、分布及性质,阐明了多环芳烃对人体的危害,并对减少其污染的防治措施进行了讨论。
本文重点介绍了光化学降解多环芳烃机理以及其影响因素,如光源种类、光照强度与时间、温度、水蒸气含量等。并且详细介绍了光化学降解汽车尾气中多环芳烃技术的最新研究进展。
关键词多环芳烃;汽车尾气;光化学降解;研究进展
Photochemical degradation of polycyclic aromatic hydrocarbons in the automobile exhaust pollution research
Abstract
Polycyclic aromatic hydrocbarons are a unique class of pollutants which are constituted by hundreds of individual contain two or more fused aromactic rings made up of carbon and hydrogen behaviors and fates of PAHs are of increasing concern,on account of their non-degradation、persisence and carcinogenic、tumorigenic and mutagenic properties of certain of aromatic hydrocarbons(PAHs) widely exist in the PAHs are carcinogenic,teratogenic and in ambience are mainly from natural sources and anthropogenic -and diesel-powered vehicles are known to contribute appreciable amounts PAHs to the atmospheric ambience in urban researchers at home and abroad have gradually begun study of paper also introduced the species,distribution and properties of polycyclic aromatic hydrocarbons,illustrated on the dangers of polycyclic aromatic hydrocarbons,and to reduce its pollution prevention and control measures are discussed.
This paper mainly introduces the mechanism of photochemical degradation of polycyclic aromatic hydrocarbons and its influencing factors,category such as light source,light intensity and time,temperature,water vapor content, introduced the photoche
mical degradation of polycyclic aromatic hydrocarbons in the exhaust technology to the latest research progress.
Keywords:polycyclic aromatic hydrocarbons;automobile exhaust;photochemical degradation;research progress
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