| 光助Fenton氧化法去除水中两种氯乙酸及其动力学研究 |
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| 引用本文： | 李先国,周璇,刘金燕,李艳霞.光助Fenton氧化法去除水中两种氯乙酸及其动力学研究[J].中国海洋大学学报(自然科学版),2012,42(3):64-69. |
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| 作者姓名： | 李先国 周璇 刘金燕 李艳霞 |
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| 作者单位： | 中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛,266100 |
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| 摘 要： | 以二氯乙酸和三氯乙酸为目标污染物,研究了光助Fenton氧化去除水中卤乙酸的可行性及影响因素,并对其动力学进行了初步研究.结果表明,影响光助Fenton氧化的因素很多,氙灯功率500 W、H2O2和Fe2+投加量分别为5.0和1.0 mmol·L-1、pH=4.0反应60 min是所考察范围内的最佳降解条件,浓度为100 μg·L-1的二氯乙酸和三氯乙酸的降解率分别为90.32％、87.77％;在实际水质pH=7.0时,相同浓度的二氯乙酸和三氯乙酸的降解率分别为75.34％、68.80％.紫外辐射与Fenton氧化对二氯乙酸和三氯乙酸的降解具有协同效应.光助Fenton氧化对二氯乙酸和三氯乙酸的降解符合一级反应动力学,表观活化能分别为30.11、31.09 kJ·mo1-1,受温度影响不大.
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| 关 键 词： | 光助Fenton氧化 二氯乙酸 三氯乙酸 降解动力学 |
Photo-Aided Fenton Oxidation for the Removal of Dichloroacetic Acid and Trichloroacetic Acid in Water and the Kinetics |
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| LI Xian-Guo
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ZHOU Xuan
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LIU Jin-Yan
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LI Yan-Xia.Photo-Aided Fenton Oxidation for the Removal of Dichloroacetic Acid and Trichloroacetic Acid in Water and the Kinetics[J].Periodical of Ocean University of China,2012,42(3):64-69. |
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| Authors: | LI Xian-Guo ZHOU Xuan LIU Jin-Yan LI Yan-Xia |
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| Institution: | (The Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China) |
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| Abstract: | The feasibility and affecting factors for removal of haloacetic acids in water were studied by using dichloroacetic acid(DCAA) and trichloroacetic acid(TCAA) as model compounds.The kinetics was further investigated.It is shown from the results that there are many factors which influence the photo-aided Fenton oxidation of DCAA and TCAA.The best condition was: the power of UV lamp was 500 W,Fe2+ and H2O2 concentrations were 1.0 and 5.0 mmol·L-1,respectively,and the initial pH was 4.0,reaction time was 60 min.Under that condition,the degradation efficiencies of DCAA and TCAA with an initial concentration of 100 μg·L-1 were 90.32% and 87.77%,respectively.When the initial pH was 7.0,the degradation efficiencies of DCAA and TCAA with the same concentration were 75.34% and 68.80%,respectively.A significant synergistic effect of UV irradiation and Fenton reagent was observed.The kinetics for degradation of DCAA and TCAA by photo-aided Fenton oxidation conforms to a pseudo first-order reaction.The apparent activation energy for degradation of DCAA and TCAA were 30.11 and 31.09 kJ·mol-1,respectively,indicating the influence of temperature to the reaction is not pronounced. |
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| Keywords: | photo-aided fenton oxidation dichloroacetic acid trichloroacetic acid degradation kinetics |
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