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取代脲类除草剂光催化降解动力学比较

阳 海 曾 健 魏宏庆 颜 东 徐 淼 易 翔 易 兵

阳 海, 曾 健, 魏宏庆, 颜 东, 徐 淼, 易 翔, 易 兵. 取代脲类除草剂光催化降解动力学比较[J]. 环境科学研究, 2015, 28(11): 1774-1780.
引用本文: 阳 海, 曾 健, 魏宏庆, 颜 东, 徐 淼, 易 翔, 易 兵. 取代脲类除草剂光催化降解动力学比较[J]. 环境科学研究, 2015, 28(11): 1774-1780.
YANG Hai, ZENG Jian, WEI Hongqin, YAN Dong, XU Miao, YI Xiang, YI Bing. Comparative Study on Photocatalytic Degradation Kinetics of Substituted Phenylurea Herbicides in Aqueous Solution[J]. Research of Environmental Sciences, 2015, 28(11): 1774-1780.
Citation: YANG Hai, ZENG Jian, WEI Hongqin, YAN Dong, XU Miao, YI Xiang, YI Bing. Comparative Study on Photocatalytic Degradation Kinetics of Substituted Phenylurea Herbicides in Aqueous Solution[J]. Research of Environmental Sciences, 2015, 28(11): 1774-1780.

取代脲类除草剂光催化降解动力学比较

基金项目: 国家自然科学基金项目(21207034);湖南省自然科学基金项目(2015JJ3056);湖南省教育厅创新平台项目(14K030)

Comparative Study on Photocatalytic Degradation Kinetics of Substituted Phenylurea Herbicides in Aqueous Solution

  • 摘要: 为研究取代脲类除草剂在TiO2光催化降解过程中的动力学规律,以非草隆、异丙隆和利谷隆3种取代脲类除草剂为研究对象,通过Langmuir-Hinshelwood动力学模型对其TiO2光催化降解动力学进行模拟,并系统探讨了催化剂用量、C0(取代脲类除草剂的初始浓度)、溶液pH、温度、ROSs(活性氧物种)和电子捕获剂等的影响. 结果表明:非草隆、异丙隆和利谷隆的TiO2光催化降解均符合假一级动力学模型,其动力学常数分别为0.082 8、0.068 7和0.095 4 min-1;取代脲类除草剂分子中的芳香环和脲桥上的取代基对降解速率常数的大小有明显的影响. ROSs试验表明,非草隆、异丙隆和利谷隆光催化降解过程中分别有91.6%、95.5%和86.8%的贡献来自·OH;而光生空穴和其他ROSs的贡献相对较小,并且电子捕获剂BrO3-和S2O82-对取代脲类除草剂的降解动力学有显著的促进作用.

     

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出版历程
  • 收稿日期:  2015-03-12
  • 修回日期:  2015-08-24
  • 刊出日期:  2015-11-25

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