大气液相中对氯甲苯与超氧阴离子自由基光化学反应  

Photochemical reaction of p-chlorotoluene with superoxide anion radical in atmospheric aqueous phase

作　　者：赵一君 朱承驻[1] 朱梦钰 董林昌 ZHAO Yijun;ZHU Chengzhu;ZHU Mengyu;DONG Linchang(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2024年第10期1348-1352,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(21876038)。

摘　　要：文章利用365nm紫外光辐照核黄素(Rf)与对氯甲苯(PCT)混合溶液,探讨对氯甲苯与超氧阴离子自由基(O_(2)^(-)·)在大气液相中的光化学反应。考察PCT和核黄素初始浓度、溶液初始pH值及液滴尺寸等因素对光致反应的影响,并对光致转化产物进行气相色谱-质谱(gas chromatography-mass spectrometry,GCMS)分析。分析结果表明:Rf经365nm紫外光激发可产生O_(2)^(-)·,PCT与O_(2)^(-)·的二级反应速率常数为2.66L/(mol·s);PCT的转化速率随Rf浓度的增加先增加后降低,而随初始pH值的增加而降低;液滴尺寸对PCT的转化速率有较大影响,光照5min时PCT液滴直径为2~3mm的转化速率是其溶液的6.3倍。In this paper,the photochemical reaction of p-chlorotoluene(PCT)with superoxide anion radical(O_(2)^(-)·)in atmospheric aqueous phase was investigated by irradiating a mixture of riboflavin(Rf)and PCT with 365 nm ultraviolet light.The influences of PCT and Rf initial concentration,initial pH value of the solution and droplet size on the photoinduced reaction were investigated,and the photoinduced conversion products were analyzed using gas chromatography-mass spectrometry(GC-MS).The results show that O_(2)^(-)·can be generated by Rf under 365 nm ultraviolet light excitation,and the second-order reaction rate constant of PCT with O_(2)^(-)·is 2.66 L/(mol·s).The conversion rate of PCT first increases and then decreases with the increase of Rf concentration,and decreases with the increase of initial pH value.The droplet size has a great influence on the conversion rate of PCT.The conversion rate of PCT when the droplet diameter is 2-3 mm is 6.3 times that of the solution under 5 min illumination.

关 键 词：超氧阴离子自由基 大气液相 对氯甲苯(PCT) 核黄素(Rf) 光解 

分 类 号：X131.1[环境科学与工程—环境科学]