UV/H_2O_2降解酚类物质动力学研究  

A Study on Oxidizing Kinetics of Phenols by UV/H\-2O\-2 System

作　　者：李绍峰[1] 孙连鹏[2] 黄君礼[3] 

机构地区：[1]深圳职业技术学院建筑工程系,广东深圳518055 [2]中山大学环境科学与工程学院,广东广州510275 [3]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090

出　　处：《中山大学学报（自然科学版）》2004年第3期99-102,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：黑龙江省自然科学基金资助项目(E01-06)

摘　　要：利用UV H2O2系统对苯酚进行氧化降解,不同的苯酚初始浓度,浓度自然对数与时间呈良好线性关系,表明苯酚与UV H2O2系统中羟自由基反应可以按假一级动力学进行处理,其表观反应速率为0 00219s-1;pH值由3 2升高至10 95时,苯酚的反应速率由0 00241s-1下降至0 00110s-1,说明pH对反应的速率有一定的影响。当反应体系温度由20℃上升至40℃时,间甲酚、苯酚和4-氯酚的反应速率常数分别为0 00419s-1和0 00582s-1、0 00219s-1和0 00473s-1、0 00160s-1和0 00459s-1,表明反应速率均有较大提高,反应自由能分别为29 341、12 521和40 158kJ mol,说明在常规水处理过程中,羟自由基与酚类物质之间的反应在室温下就可以很快完成。The reaction between phenol and UV/H\-2O\-2 system can be regarded as a pseudo-first-order kinetics, procezo with 0\^002 29 s~\{-1\} as oxidation kinetic constant. When the pH values are 3.2,4.95,6.98,9.15 and 10.95, the kinetic constants become 0.002 41, 0.002 28,0.002 19, 0.001 85 and 0.001 1 s~\{-1\}, respectively. When the temperature rises up from 20 ℃ to 40 ℃, the range of kinetics constant is 0.004 79 and 0.005 82 for s-mesol,\{0\^002 29\} and 0\^004 73 for phenol and 0.001 60 and 0\^004 59 s~\{-1\} for 4-chlorine. The activation energy is 29\^3 kJ/mol for s-mesol, 12\^5 kJ/mol for phenol and 40\^2 kJ/mol for 4-chlorine, which demonstrated that the hydroxyl radical could oxidize phenols quickly under room temperature condition in the conventional water treatment process.

关 键 词：UV/H2O2 动力学 假一级反应 表观速率常数 活化能 

分 类 号：TU991.25[建筑科学—市政工程]