光-Fe^3＋-草酸体系中对氯苯酚的冰相光转化  

Photoconversion of p-Chlorphenol in Photo-Fe^(3+)-oxalic Acid System in Ice

作　　者：薛洪海[1] 彭菲[1] 赵旭辉[1] 康春莉[1] 李林璘[1] 李哲[1] 刘汉飞[1] 

机构地区：[1]吉林大学环境与资源学院,地下水资源与环境教育部重点实验室,长春130012

出　　处：《高等学校化学学报》2011年第5期1077-1082,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:41073063)资助

摘　　要：研究了在光(λ>290 nm)-Fe3+-草酸作用下冰相中对氯苯酚(4-CP)的光转化.结果表明,Fe3+-草酸的存在对冰相中4-CP的光转化有促进作用.Fe3+和草酸的初始浓度及其比例和初始pH值对体系中4-CP的转化率具有较大影响.当溶液初始pH=6.50,草酸初始浓度为0.80 mmol/L,Fe3+和草酸的初始浓度比为1∶5时,4-CP光照7.5 h转化率可达39.1%.4-CP的光转化符合一级动力学模型.分别利用直接萃取法和衍生化法富集了反应中间产物,并采用GC-MS分析,推断了反应机理.利用苯甲酸捕获了体系中产生的羟基自由基(.OH),进一步证明了.OH参与了该体系中4-CP的光转化.Photoconversion of 4-CP in photo（λ〉290 nm）-Fe3＋-oxalic acid system in ice was investigated.The results showed that adding Fe3＋ and oxalic acid accelerated the photoconversion of 4-CP.The initial concentration of Fe3＋ and oxalic acid,the ratio of the initial concentration of Fe3＋ and oxalic acid,and the initial pH value have significant influence on the photoconversion of 4-CP,the conversion of 4-CP reaches 39.1% after irradiation for 7.5 h when the initial pH value is 6.5,the ratio of the initial concentration of Fe3＋ and oxa-lic acid is 1∶5,and the initial concentration of oxalic acid is 0.8 mmol/L.The photoconversion of 4-CP obeys the first order kinetics equation.The photoproducts of 4-CP were enriched through direct extraction and derivatization,respectively,then analyzed by GC-MS and the mechanisms were deduced.Furthermore,·OH was trapped by benzoic acid suggesting that ·OH was involved in the photoconversion of 4-CP.The results have important theoretical and practical significance on understanding the environmental behavior of organic pollutants in ice.

关 键 词：对氯苯酚 光转化 冰相 草酸 三价铁离子 

分 类 号：O644.1[理学—物理化学] X132[理学—化学]