| CTAC改性膨润土吸附去除水体中高氯酸盐的离子交换性能研究 |
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| 引用本文： | 肖讴,陈兵,杨志泉.CTAC改性膨润土吸附去除水体中高氯酸盐的离子交换性能研究[J].环境科学学报,2013,33(2):415-423. |
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| 作者姓名： | 肖讴 陈兵 杨志泉 |
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| 作者单位： | 1. 华南理工大学环境科学与工程学院,广州510006;工业聚集区污染控制与生态修复教育部重点试验室,广州510006
2. 华南理工大学环境科学与工程学院,广州510006;工业聚集区污染控制与生态修复教育部重点试验室,广州510006;亚热带建筑科学国家重点试验室,广州510640 |
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| 基金项目： | 国家自然科学基金项目(No.51008128, 51108187);广东高校优秀青年创新人才培育项目(粤财教[2009]400号);亚热带建筑科学国家重点试验室开放基金(No.2010KB19);中央高校基本科研业务项目(No.2011ZM0052, 2012ZM0041) |
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| 摘 要： | 选用阳离子表面活性剂十六烷基三甲基氯化铵(CTAC)改性膨润土以提高膨润土对ClO4-的吸附能力.试验结果表明,CTAC改性能显著提高膨润土对ClO4-的吸附能力,在0.1～l mmol·L-1的C1O4-溶液中,6h内能迅速达到吸附平衡.有机膨润土对ClO4-的吸附最符合Langmuir等温吸附模型,其吸附容量可达0.48 mmol·g-1.pH值在4～10范围内变化对ClO-的吸附几乎没有影响.高的分配系数(Kd＞1.5×103cm3·g-1)表明有机膨润土对ClO4-有很高的选择性,各阴离子的分配系数从小到大的顺序为HPO42-＜ SO42-＜ NO3-＜ ClO4-,这与阴离子的自由水合能大小相一致.1 mol·L-1 HCl溶液对吸附剂的再生效率在96％左右,可直接使用,不用再改性.
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| 关 键 词： | 十六烷基三甲基氯化铵(CTAC) 膨润土 高氯酸根离子 选择性 吸附 再生 |
| 收稿时间： | 2012/4/27 0:00:00 |
| 修稿时间： | 2012/8/16 0:00:00 |
Bentonite modified with cetyltrimethylammonium chloride as highly efficient anion exchanger for perchlorate ion |
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| XIAO Ou,CHEN Bing and YANG Zhiquan.Bentonite modified with cetyltrimethylammonium chloride as highly efficient anion exchanger for perchlorate ion[J].Acta Scientiae Circumstantiae,2013,33(2):415-423. |
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| Authors: | XIAO Ou CHEN Bing and YANG Zhiquan |
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| Institution: | 1. Department of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006;2. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006;1. Department of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006;2. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006;1. Department of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006;2. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006;3. State Key Laboratory of Subtropical Building Science, Guangzhou 510640 |
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| Abstract: | Cationic surfactant cetyltrimethylammonium chloride (CTAC) was employed to modify a bentonite for enhancing its adsorption for perchlorate. The results showed that CTAC modification greatly improved adsorption of bentonite. The perchlorate uptake on CTAC-bentonite from 0.1 to 1 mmol·L-1 solution rapidly attained equilibrium within 6 h. The perchlorate uptake on CTAC-bentonite followed the Langmuir isotherm model with capacity of 0.48 mmol·g-1. In addition, the adsorption capacity persisted in a wide pH of 4~10. High selectivity of CTAC-bentonite for perchlorate ion was reflected in the high distribution coefficient values (>1.5×103 cm3·g-1) with selectivity sequence of HPO42- < SO42- < NO3-< ClO4-. This selectivity sequence corresponded to the sequence of increasing hydration energy of anions. CTAC-bentonite regeneration using 1 mol·L-1 of HCl solution was investigated, which showed efficiency of 96%. CTAC-bentonite could be reused directly after regeneration with 1 mol·L-1 of HCl solution. |
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| Keywords: | cetyltrimethylammonium chloride bentonite perchlorate ion selectivity uptake regeneration |
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