腐植酸作用下γ-六氯环己烷在冰相中的光转化

发布时间：2018-05-31 01:17

本文选题：γ-六氯环己烷 + 腐植酸　；参考：《高等学校化学学报》2016年12期

【摘要】：研究了腐植酸(HA)存在下冰相体系中γ-六氯环己烷(γ-HCH)的光转化规律.结果表明,HA浓度对γ-HCH的光转化率呈现低浓度促进而高浓度抑制的现象;盐离子浓度、NO_2~-及NO_3~-对γ-HCH的光转化率均有促进作用;低浓度Fe~(3+)对γ-HCH的光转化率有促进作用,当Fe~(3+)的浓度增大到50μmol/L时,呈现抑制效应;γ-HCH在不同p H值条件下光转化速率的大小顺序为碱性中性酸性.冰相中HA通过产生单线态氧(~1O_2)、羟基自由基(·OH)及三重激发态(HA*)加速γ-HCH的光转化.HA存在下γ-HCH的光转化产物主要是五氯环己烯、邻二氯苯和对二氯苯、一氯苯,光转化过程中~1O_2通过消耗中间产物间接加速了γ-HCH的光转化过程.
[Abstract]:The phototransformation of 纬 -HCH in the presence of HA) was studied. The results showed that the photoconversion rate of 纬 -HCH was promoted by low concentration of HA and inhibited by high concentration of Ha-H, the light conversion rate of 纬 -HCH was promoted by the concentration of salt ion, the light conversion rate of 纬 -HCH was promoted by low concentration of Fe~(3, and the light conversion rate of 纬 -HCH was promoted by low concentration of Fe~(3. When the concentration of Fe~(3 increased to 50 渭 mol/L, the inhibitory effect was observed, and the order of photoconversion rate of 纬 -HCH was alkaline neutral acid at different pH values. In the ice phase, HA accelerates the photoconversion of 纬 -HCH by producing singlet oxygen and 1O _ 2C, hydroxyl radical (OH) and triplet excited state. In the presence of HA, the photo-conversion products of 纬 -HCH are mainly pentachlorocyclohexene, o-dichlorobenzene and p-dichlorobenzene, monochlorobenzene, and p-dichlorobenzene. The photoconversion process of 纬 -HCH was accelerated indirectly by consuming intermediate products.
【作者单位】：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;
【基金】：国家自然科学基金(批准号:41073063)资助~~
【分类号】：O636.9;O644.1

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