本文關鍵詞：實驗室模擬大氣中醛類與硫酸銨及胺類的液相反應研究　出處：《山東大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 二次有機氣溶膠 乙醇醛 苯甲醛 異丁烯醛 硫酸銨

【摘要】：大氣中氣溶膠根據(jù)來源分為一次氣溶膠和二次氣溶膠。大氣中揮發(fā)性有機物可以通過氣相反應或者云霧水及顆粒物的液相反應形成二次有機氣溶膠。實驗選取乙醇醛、苯甲醛及異丁烯醛作為研究對象,分別模擬研究云水或顆粒相中與硫酸銨、甲胺及甘氨酸的液相反應。乙醇醛、苯甲醛及異丁烯醛是大氣中揮發(fā)性有機物(異戊二烯、甲苯等)光氧化反應的重要產(chǎn)物。硫酸銨是大氣環(huán)境中含量較大且化學性質(zhì)穩(wěn)定的無機鹽。甘氨酸是大氣氣溶膠中含量最多的游離氨基酸。烷基胺是大氣中較為普遍的含氮化合物,甲胺是其中最簡單的有機含氮化合物。研究乙醇醛、苯甲醛及異丁烯醛與硫酸銨、甲胺及甘氨酸液相反應產(chǎn)生二次有機氣溶膠,一方面可以進一步完善液相反應生成二次有機氣溶膠過程的相關內(nèi)容,另一方面可以加深對反應產(chǎn)物的形成過程及產(chǎn)物的光學性質(zhì)的理解,對于預測大氣環(huán)境中的二次有機氣溶膠的液相形成及研究其對能見度及氣候影響具有重要意義。本研究的主要內(nèi)容為：模擬大氣云水或顆粒相中乙醇醛、苯甲醛及異丁烯醛分別與硫酸銨、甲胺及甘氨酸反應產(chǎn)生二次有機氣溶膠的過程及產(chǎn)物的光學性質(zhì)。具體包括：(1)研究不同濃度乙醇醛與硫酸銨、甲胺和甘氨酸的反應,通過紫外-可見吸收譜研究產(chǎn)物的光學性質(zhì),通過質(zhì)譜分析可能的產(chǎn)物。此外,為了研究硫酸銨、甲胺及甘氨酸之間的相互影響,研究了硫酸銨、甲胺及甘氨酸混合后與乙醇醛的反應。(2)研究苯甲醛與硫酸銨、甲胺及甘氨酸的反應。(3)研究異丁烯醛與硫酸銨、甲胺及甘氨酸的反應。結(jié)果表明,相同濃度下乙醇醛與甘氨酸反應產(chǎn)生吸光產(chǎn)物的速度最快,且量最大,甲胺次之,硫酸銨最慢,其中主要發(fā)生醇醛縮合、縮醛及生成亞胺反應。苯甲醛可以與硫酸銨、甲胺及甘氨酸發(fā)生反應,但反應速度較慢,對二次有機氣溶膠的貢獻較小。異丁烯醛與硫酸銨、甲胺沒有反應,與甘氨酸的反應較為緩慢,對二次有機氣溶膠的形成貢獻很小。
[Abstract]:Aerosols in the atmosphere can be divided into primary aerosol and secondary aerosol according to their source. Volatile organic compounds in the atmosphere can be formed by aerosol reaction or liquid phase reaction of cloud water and particulate matter. Aldehydes. Benzaldehyde and isobutenaldehyde were used to simulate the liquid phase reaction of ammonium sulfate, methylamine and glycine in cloud water or granular phase. Benzaldehyde and isobutenaldehyde are volatile organic compounds (isoprene) in the atmosphere. Toluene et al.). Ammonium sulfate is an inorganic salt with high content and stable chemical properties in the atmospheric environment. Glycine is the most abundant free amino acid in atmospheric aerosol. Alkylamine is the most common amino acid in the atmosphere. Nitrogen compounds. Methylamine is the simplest organic nitrogen-containing compound. The secondary organic aerosol was produced by the reaction of ethanol aldehyde, benzaldehyde and isobutenal with ammonium sulfate, methylamine and glycine in liquid phase. On the one hand, it can further improve the content of the formation of secondary organic aerosol from liquid phase reaction, on the other hand, it can deepen the understanding of the formation process of the reaction products and the optical properties of the products. It is of great significance to predict the formation of secondary organic aerosols in the atmosphere and to study their effects on visibility and climate. The main contents of this study are as follows: modeling glycolaldehyde in cloud water or granular phase. The reaction of benzaldehyde and isobutenaldehyde with ammonium sulfate, methylamine and glycine to produce secondary organic aerosol and the optical properties of the product were studied. The reaction of methylamine with glycine was studied by UV-Vis absorption spectroscopy, and the possible products were analyzed by mass spectrometry. In addition, the interaction among ammonium sulfate, methylamine and glycine was studied. The reaction of ammonium sulfate, methylamine and glycine with ethanol aldehydes was studied. The reaction of benzaldehyde with ammonium sulfate, methylamine and glycine was studied. The reaction of methylamine and glycine. The results showed that the reaction of glycine with glycine at the same concentration had the fastest rate and the largest amount, followed by methylamine and ammonium sulfate, among which the condensation of alcohol and aldehydes occurred mainly. Benzaldehyde can react with ammonium sulfate, methylamine and glycine, but the reaction rate is slower and the contribution to secondary organic aerosol is small. Isobutenal has no reaction with ammonium sulfate and methylamine. The reaction with glycine is slow and has little contribution to the formation of secondary organic aerosols.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X513

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