高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (12): 2253-2259.doi: 10.7503/cjcu20160414

• 物理化学 • 上一篇    下一篇

腐植酸作用下γ-六氯环己烷在冰相中的光转化

包思琪, 康春莉, 钟宇博, 周林, 姚志富, 黄冬梅, 王宇寒, 田涛()   

  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 130021
  • 收稿日期:2016-06-08 出版日期:2016-12-10 发布日期:2016-11-18
  • 作者简介:联系人简介: 田 涛, 男, 博士, 讲师, 主要从事环境化学方面的研究. E-mail:tiantao@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 41073063)资助

Photoconversion of γ-Hexachlorocyclohexane in the Presence of Humic Acid in Ice

BAO Siqi, KANG Chunli, ZHONG Yubo, ZHOU Lin, YAO Zhifu, HUANG Dongmei, WANG Yuhan, TIAN Tao*()   

  1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130021, China
  • Received:2016-06-08 Online:2016-12-10 Published:2016-11-18
  • Contact: TIAN Tao E-mail:tiantao@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.41073063)

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、 NO2-及NO3-γ-HCH的光转化率均有促进作用; 低浓度Fe3+γ-HCH的光转化率有促进作用, 当Fe3+的浓度增大到50 μmol/L时, 呈现抑制效应; γ-HCH在不同pH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(1O2)、 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1O2通过消耗中间产物间接加速了γ-HCH的光转化过程.

关键词: γ-六氯环己烷, 腐植酸, 光转化,

Abstract:

The photoconversion regularity of γ-hexachlorocyclohexane(γ-HCH) in snow and ice in the presence of humic acid(HA) were studied. The results showed that the photoconversion efficiency of γ-HCH was promoted at low initial concentration of HA, but inhibited at high concentration of HA. Salt ion concentration, NO2- and NO3- all promoted the photoconversion efficiency of γ-HCH. The photoconversion efficiency of γ-HCH was promoted at low initial concentration of Fe3+, but inhibited when the concentration of Fe3+ reached 50 μmol/L. The sequence of photoconversion rate of γ-HCH at different pH was alkaline>neutral>acidic. HA accelerated the photoconversion of γ-HCH by producing singlet oxygen(1O2), hydroxyl free radical(·OH) and triple excited state(HA*) in ice. Photoproducts of γ-HCH in the presence of HA are mainly pentachloro-cyclohexene, p-dichlorobenzene and o-dichlorobenzene, 1-chlorobenzene, and 1O2 indirectly accelerated the photoconversion of γ-HCH by consuming the intermediate products.

Key words: γ-Hexachlorocyclohexane(γ-HCH), Humic acid(HA), Photoconversion, Ice