引用本文:
雷宇, 陆军, 马建中, 王涛, 彭书传, 朱承驻. 355 nm光照下液相中甲苯与亚硝酸的交叉反应[J]. 环境化学, 2017, 36(8): 1693-1699
LEI Yu, LU Jun, MA Jianzhong, WANG Tao, PENG Shuchuan, ZHU Chengzhu. Cross reaction of toluene with nitrous acid in aqueous phase initiated by irradiation of 355 nm UV light[J]. Environmental Chemistry, 2017, 36(8): 1693-1699

355 nm光照下液相中甲苯与亚硝酸的交叉反应
雷宇1, 陆军2, 马建中1, 王涛1, 彭书传1, 朱承驻1,3
1. 合肥工业大学资源与环境工程学院, 合肥, 230009;
2. 合肥工业大学分析测试中心, 合肥, 230009;
3. 合肥工业大学大气环境与污染控制研究所, 合肥, 230009
摘要:
利用激光闪光光解技术研究了在355 nm激光作用下甲苯与亚硝酸的交叉反应机理,考察了反应瞬态物种的生长和衰减行为,对产物进行了GC-MS分析.结果表明,HNO2在355 nm的紫外光照下产生的OH自由基和甲苯有两种反应途径,其一是加成反应,甲苯与OH自由基反应生成CH3C6H5-OH加合物,反应速率常数为(4.1±0.4)×109 L·mol-1·s-1,该反应途径在对流层大气中占主导地位;其二是发生在侧链甲基上的提氢反应,反应生成苄基自由基.有氧条件下,CH3C6H5-OH可与O2反应,氧化为CH3C6H5-OHO2,反应速率常数为(6.8±0.2)×108 L·mol-1·s-1.
关键词:    激光闪光光解    瞬态吸收光谱    亚硝酸    甲苯    OH自由基    大气液相   
Cross reaction of toluene with nitrous acid in aqueous phase initiated by irradiation of 355 nm UV light
LEI Yu1, LU Jun2, MA Jianzhong1, WANG Tao1, PENG Shuchuan1, ZHU Chengzhu1,3
1. School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China;
2. Center of Analysis & Measurement, Hefei University of Technology, Hefei, 230009, China;
3. Institute of Atmospheric Environment & Pollution Control, Hefei University of Technology, Hefei, 230009, China
Abstract:
Reaction mechanism of aqueous solution of toluene with nitrous acid in the presence of O2 and absence of O2 were studied by laser flash photolysis. The main characteristic peaks in these transient absorbance spectra were assigned and the build-up/decay processes of several transient species were investigated. Results illustrated ·OH was produced in aqueous solution of nitrous acid exposed to 355 nm laser beam. There are two possible pathways of the reaction between ·OH and toluene. The first is radical adduct formation, especially the addition of ·OH to aromatic ring. The bimolecular rate constant was measured to be (4.1±0.4)×109 L·mol-1·s-1, and it was considered as a dominated way of the reaction between ·OH and toluene in troposphere system. In addition, ·OH could also abstract a hydrogen atom from side chain methyl group to form benzyl radicals. The transient product CH3C6H5-OH reacted with O2 to form CH3C6H5-OHO2 with a rate constant of (6.8±0.2)×108 L·mol-1·s-1. The photo products were analyzed by GC/MS and the possible reaction pathways were discussed.
Key words:    laser flash photolysis    transient absorption spectra    nitrous acid    toluene    ·OH radical    atmospheric aqueous phase   
收稿日期: 2016-11-30
基金项目: 国家自然科学基金(21177034)资助.
朱承驻,Tel:+86-551-62901523,E-mail:czzhu@hfut.edu.cn
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