UV/H_2O_2作用下冰中苯酚的光转化及其与羟基自由基的关系  

Phenol Photolysis in Ice and the Relationship between the Photolysis and Hydroxyl Radicals under UV/H_2O_2 Systems

作　　者：王洪良[1] 钟宇博 石磊[1] 康春莉[1] 刘汉飞[1] 陈柏言[1] 刘婷婷[1] 武家玉 

机构地区：[1]吉林大学环境与资源学院,长春130012

出　　处：《吉林大学学报（理学版）》2014年第1期144-150,共7页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:20577014;41073063)

摘　　要：在UV和H2O2作用下考察pH值、光强、H2O2初始浓度和无机离子等对冰中苯酚光解的影响,并利用二甲基亚砜(DMSO)捕获体系中生成的羟基自由基(·OH)研究·OH对冰中苯酚光解的影响.实验结果表明:H2O2可显著促进冰中产生·OH及苯酚光解;改变光强、pH值和H2O2的初始浓度,苯酚的光解率随体系中·OH浓度的增加而增大;加入NO-2和NO-3可抑制体系中产生·OH及苯酚光解;加入SO2-4不影响体系中·OH的产生及苯酚光解;加入CO2-3和HCO-3可抑制体系中产生·OH,但对苯酚光解影响较小,这是由于体系中产生了其他自由基所致.The photolysis of phenol in a UV/H2 O2 system in ice was investigated and the effects of pH value,light intensity and the initial concentration of H2 O2 on the photolysis of phenol were discussed. In addition,Hydroxyl radicals （· OH）generated during the photolysis of phenol were trapped by dimethylsulfoxide （DMSO）,thus the effect of·OH radicals on the photolysis of phenol was studied. The results show that H2 O2 significantly increased ·OH generation and enhanced the photolysis of phenol in ice.Changing light intensity,pH value and the initial concentration of H2 O2 ,the photolysis rate of phenol would increased with the increase of·OH generation.The addition of NO-2 and NO-3 inhibited the generation of·OH and the photolysis of phenol.But SO2-4 had no impact on·OH generation and the photolysis of phenol.Though CO2-3 and HCO-3 decreased ·OH generation,they also had no impact on the photolysis,which might be due to the other radicals generated in the system.

关 键 词：苯酚 光解 羟基自由基 冰 过氧化氢 

分 类 号：X132[环境科学与工程—环境科学]