摘要
甲苯和氨是大气中常见的有机和无机污染物,它们能够溶于大气液相气溶胶等水相中,与水相中的过氧化氢在太阳光照射下发生液相光氧化反应.利用紫外可见分光光度计和质谱研究了氨对甲苯与过氧化氢的光氧化反应产物的影响,考察了搅拌速率、温度、光照时间、过氧化氢浓度、氨浓度和溶液pH值等因素对反应产物的影响规律.实验结果表明,甲苯与过氧化氢的光氧化产物主要是醛类化合物,而氨存在时,会与这些醛类化合物反应形成咪唑类含氮有机物.咪唑类产物随着搅拌速率的加大、温度的升高、光照时间的延长、氨浓度和过氧化氢浓度的增大而增大.酸性和强碱性条件不利于咪唑类产物的产生.这为甲苯液相光降解提供了实验依据.
Toluene and ammonia are common organic and inorganic pollutants in the atmosphere.They can dissolve in aqueous phases such as liquid aerosol,and react with hydrogen peroxide in the aqueous phase under the irradiation of sunlight.The effects of ammonia on the photooxidation reaction products of toluene with hydrogen peroxide were measured by UV-Vis spectrophotometer and mass spectrometer,and the effects of stirring rate,temperature,illumination time,hydrogen peroxide concentration,ammonia concentration and solution pH on the reaction products were investigated in this study.The experimental results show that the photooxidation products of toluene and hydrogen peroxide are mainly aldehyde compounds,and in the presence of ammonia,they react with these aldehyde compounds to form imidazole nitrogen-containing organic compounds.The imidazole products increase with the increase of stirring rate,temperature,illumination time,ammonia concentration and hydrogen peroxide concentration.Acidic and strong basic conditions are not conducive to the production of imidazole products.This provides an experimental basis for photodegradation of toluene in aqueous phase.
作者
朱敏聪
郑宇婷
黄明强
朱申红
ZHU Min-cong;ZHENG Yu-ting;HUANG Ming-qiang;ZHU Shen-hong(College of Chemistry & Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, China;School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China)
出处
《青岛理工大学学报》
CAS
2020年第2期114-120,共7页
Journal of Qingdao University of Technology
基金
福建省自然科学基金资助项目(2015J06009)
福建省教育厅中青年教师科研项目(JAT160304)
闽南师范大学科技项目(MK201722)。
关键词
氨
甲苯
过氧化氢
光氧化
ammonia
toluene
hydrogen peroxide
photooxidation
