Fenton和类Fenton氧化处理地下水中BTEX及其动力学
Treatment of BTEX in groundwater by Fenton’s and Fenton-like oxidation reaction and the kinetics
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摘要: 研究比较Fenton试剂和类Fenton试剂氧化处理地下水中苯、甲苯、乙苯和二甲苯（BTEX）的效果及动力学。结果表明，Fenton氧化处理BTEX较类Fenton效果好，且反应过程中体系均处于强氧化环境，pH值维持在3左右；Fenton和类Fenton氧化去除BTEX过程均符合二级反应动力学方程：1/C=kt+1/C0，且Fenton和类Fenton氧化去除BTEX的平均半衰期分别为0.057 h和0.642 h，氧化处理过程速率常数大小均为乙苯＞二甲苯＞甲苯＞苯。Abstract: The removal efficiency and the kinetics of oxidation treatment of benzene， toluene， ethyl benzene and xylenes（BTEX）contaminated groundwater by Fenton’s reagent and Fenton-like reagent were investigated and compared in the groundwater. The results indicated that Fenton’s reagent has a better removal effect on BTEX than Fenton-like reagent. Moreover，both Fenton and Fenton-like reaction systems were in strong oxidation environments and the pH maintained around 3 during the whole processes. The oxidation processes of BTEX by Fenton’s reagent and Fenton-like reagent both followed the second order reaction kinetic equation: 1/C=kt+1/C0. The average half-lives of BTEX treated by Fenton’s reagent and Fenton-like reagent were 0.057 h and 0.642 h respectively. The order of the rate constants during the oxidation processes was ethyl benzene＞xylenes＞toluene＞benzene.
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Key words:
- Fenton’s reagent /
- Fenton-like reagent /
- oxidative treatment /
- BTEX /
- kinetics
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