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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (19): 2307-2312. 上一篇    下一篇

研究论文

日光/Fe2＋/S2O82-体系中酸性刚果红的降解机理

张乃东*，朱正江，栾万利   

  1. (大连海事大学环境科学与工程学院 大连 116026)
  • 投稿日期:2011-05-31 修回日期:2011-07-06 发布日期:2011-09-09
  • 通讯作者: 张乃东 E-mail:dongnzh@yahoo.com.cn
  • 基金资助:

    国家自然科学基金;大连市科技计划项目

Degradation Mechanism of Acidic Congo Red in Sunlight/Fe2＋/ S2O82- S ystem  

ZHANG Nai-Dong, ZHU Zheng-Jiang, LUAN Wan-Li   

  • Received:2011-05-31 Revised:2011-07-06 Published:2011-09-09
  • Contact: Naidong Zhang E-mail:dongnzh@yahoo.com.cn

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实验中发现在降解酸性刚果红时日光/Fe2＋/过二硫酸法好于UV/Fe2＋/过二硫酸法, 50 μmol/L的酸性刚果红在模拟日光照射下60 min脱色率为100%, 120 min TOC去除率为80.4%|UV灯照射下120 min酸性刚果红脱色率为99%, TOC去除率为69.6%. 对日光/Fe2＋/ 体系中酸性刚果红的降解机理进行了研究, 实验证明, 刚果红在降解时形成了中间体——醌亚胺类, 醌亚胺类是光敏性物质, 对可见光更敏感, 在可见光辐射下发生光敏化反应, 生成了单线态氧1O2和过氧自由基 •. •在酸性条件下促进•OH和 •的生成, 导致体系中活性物质增多.

关键词: 硫酸自由基, 过二硫酸盐, 日光, 刚果红

It has been proved that sunlight/Fe2+/S2O82- method is superior to UV/Fe2+/S2O82- method in the process of acidic Congo red degradation. By using simulated sunlight /Fe2+/S2O82- method, the decoloring rate of acidic Congo red(50μmol/L) was up to 100% after 60min reaction and the TOC removal rate of acidic Congo red was up to 80.4% after 120min reaction, by using UV/Fe2+/S2O82- method, the decoloring rate of acidic Congo red got to 99% after 120min reaction while the TOC removal rate of acidic Congo red reached 69.6% after 120min reaction. The degradation mechanism of acidic Congo red was studied in the simulated sunlight /Fe2+/S2O82- system. The results showed that the intermediate materials of Quinonoids imine class could be generated in the process of degradation, and Quinonoids imine class has photosensitivity and is more sensitive to visible light. Quinonoids imine class is induced photosensitive reaction under visible light, which yielded singlet oxygen 1O2 and peroxy radical O2?-. O2?- can promote the generation of hydroxyl radicals ?OH and sulfate radicals SO4-? in acidic condition, which can cause more active material to be produced in this system .

Key words: sulfate radical, persulfate, sunlight, Congo red