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UV/PS降解阿特拉津机理及动力学分析

陆一新 何悦 张建强 符琛琛 陈佼

陆一新, 何悦, 张建强, 符琛琛, 陈佼. UV/PS降解阿特拉津机理及动力学分析[J]. 西南交通大学学报, 2020, 55(3): 635-642, 680. doi: 10.3969/j.issn.0258-2724.20180523
引用本文: 陆一新, 何悦, 张建强, 符琛琛, 陈佼. UV/PS降解阿特拉津机理及动力学分析[J]. 西南交通大学学报, 2020, 55(3): 635-642, 680. doi: 10.3969/j.issn.0258-2724.20180523
LU Yixin, HE Yue, ZHANG Jianqiang, FU Chenchen, CHEN Jiao. Mechanism and Kinetic Analysis on Degradation of Atrazine by UV/PS[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 635-642, 680. doi: 10.3969/j.issn.0258-2724.20180523
Citation: LU Yixin, HE Yue, ZHANG Jianqiang, FU Chenchen, CHEN Jiao. Mechanism and Kinetic Analysis on Degradation of Atrazine by UV/PS[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 635-642, 680. doi: 10.3969/j.issn.0258-2724.20180523

UV/PS降解阿特拉津机理及动力学分析

doi: 10.3969/j.issn.0258-2724.20180523
基金项目: 四川省科技计划项目(2017GZ0375);成都市科技惠民技术研发项目(2015-HM01-00333-SF)
详细信息
    作者简介:

    陆一新(1980—),女,副教授,博士,研究方向为水处理理论与技术,E-mail:yxlu61@163.com

    通讯作者:

    张建强(1963—),男,教授,博士,研究方向为污染环境生态修复理论和技术,E-mail:zhjiqicn@swjtu.cn

  • 中图分类号: X703.1

Mechanism and Kinetic Analysis on Degradation of Atrazine by UV/PS

  • 摘要: 为了解决阿特拉津(atrazine,ATZ)对水体污染问题,采用紫外/过二硫酸盐 (ultraviolet/peroxodisulfate,UV/PS) 降解水体中的ATZ,考察了不同pH值、UV强度、PS浓度、温度条件下UV/PS对ATZ的降解效果,同时对其降解机理、降解动力学及降解路径进行了探讨. 机理分析表明,UV可使ATZ发生光解,UV/PS能快速降解水体中ATZ,中性偏碱性条件下UV/PS体系中同时存在SO4• 和 •OH. 动力学分析表明,不同温度、pH值、PS浓度、UV强度条件下UV/PS降解ATZ动力学符合准一级反应动力学. 降解路径分析表明,ATZ主要通过脱氯、加羟基、脱乙基、脱异丙基等方式被降解,几种降解方式并不孤立,但三嗪环并未开环降解. 试验结果表明,反应体系温度为25 ℃,PS浓度为70 μmol/L,UV强度为50 mW/cm2,反应体系初始pH为5.8,反应时间为20 min时,UV/PS体系对2.5 μmol/L ATZ的降解率可达91.03%.

     

  • 图 1  pH对ATZ降解效果的影响

    Figure 1.  Effect of pH on ATZ degradation efficiency

    图 2  UV强度对ATZ降解效果的影响

    Figure 2.  Effect of UV intensity on ATZ degradation efficiency

    图 3  PS浓度对ATZ降解效果的影响

    Figure 3.  Effect of PS concentration on ATZ degradation efficiency

    图 4  温度对ATZ降解效果的影响

    Figure 4.  Influence of temperature on ATZ degradation efficiency

    图 5  UV/PS体系中各组分氧化效果分析及乙醇对UV/PS降解ATZ的影响

    Figure 5.  Analysis on oxidation effect of each component in UV/PS system and effect of ETA on degradation of ATZ by UV/PS

    图 6  UV/PS降解ATZ可能降解路径

    注:(1)—去C-N键断裂; (2)—羟基化; (3)—脱水反应.

    Figure 6.  Possible degradation pathways of ATZ by UV/PS

    表  1  不同反应条件下UV/PS降解ATZ反应动力学拟合参数

    Table  1.   Fitted kinetics parameters of UV/PS degradation ATZ in different reaction conditions

    反应条件速率常数/min−1R2动力学方程
    pH 3.0 0.360 6 0.972 3 $\ln \left( {C/{C_0}} \right) = - 0.360\;6t + 0.240\;6$
    4.0 0.290 6 0.956 8 $\ln \left( {C/{C_0}} \right) = - 0.290\;6t + 0.144\;5$
    7.0 0.381 9 0.997 9 $\ln \left( {C/{C_0}} \right) = - 0.381\;9t - 0.021\;6$
    8.0 0.270 5 0.995 0 $\ln \left( {C/{C_0}} \right) = - 0.207\;5t + 0.067\;1$
    9.0 0.283 6 0.994 6 $\ln \left( {C/{C_0}} \right) = - 0.283\;6t + 0.059\;5$
    UV强度/(mW•cm−2 30 0.004 9 0.912 2 $\ln \left( {C/{C_0}} \right) = - 0.004\;9t - 0.026\;6$
    50 0.044 1 0.997 7 $\ln \left( {C/{C_0}} \right) = - 0.044\;1t - 0.010\;8$
    100 0.070 9 0.998 5 $\ln \left( {C/{C_0}} \right) = - 0.070\;9t - 0.009\;8$
    PS浓度/(μmol•L−1 10 0.022 9 0.977 7 $\ln \left( {C/{C_0}} \right) = - 0.022\;9t + 0.013\;2$
    20 0.035 0 0.982 7 $\ln \left( {C/{C_0}} \right) = - 0.035\;0t - 0.041\;3$
    30 0.044 1 0.997 7 $\ln \left( {C/{C_0}} \right) = - 0.044\;1t - 0.010\;8$
    40 0.055 3 0.978 3 $\ln \left( {C/{C_0}} \right) = - 0.055\;3t - 0.009\;8$
    50 0.074 2 0.992 0 $\ln \left( {C/{C_0}} \right) = - 0.074\;2t - 0.074\;4$
    60 0.092 2 0.989 9 $\ln \left( {C/{C_0}} \right) = - 0.092\;2t - 0.058\;4$
    70 0.116 9 0.984 5 $\ln \left( {C/{C_0}} \right) = - 0.116\;9t + 0.057\;1$
    温度/℃ 10 0.032 4 0.971 5 $\ln \left( {C/{C_0}} \right) = - 0.032\;4t - 0.082\;9$
    15 0.053 8 0.987 7 $\ln \left( {C/{C_0}} \right) = - 0.053\;8t - 0.055\;8$
    20 0.074 2 0.992 0 $\ln \left( {C/{C_0}} \right) = - 0.074\;2t - 0.074\;4$
    25 0.122 8 0.992 2 $\ln \left( {C/{C_0}} \right) = - 0.122\;8t - 0.011\;1$
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出版历程
  • 收稿日期:  2018-06-21
  • 修回日期:  2018-10-22
  • 网络出版日期:  2020-05-11
  • 刊出日期:  2020-06-01

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