| 改性硅藻土对水中DDTs的吸附机理 |
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| 引用本文： | 谭凌智,祁士华,张家泉,张小辉,柯艳萍,于佳,陈静,严春杰. 改性硅藻土对水中DDTs的吸附机理[J]. 地球科学, 2012, 37(3): 621-626. DOI: 10.3799/dqkx.2012.071 |
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| 作者姓名： | 谭凌智 祁士华 张家泉 张小辉 柯艳萍 于佳 陈静 严春杰 |
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| 作者单位： | 1.生物地质与环境地质教育部重点实验室, 中国地质大学环境学院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目41073070生物地质与环境地质教育部实验室开放基金项目BGEG1012 |
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| 摘 要： | 采用阳离子表面活性剂(十六烷基三甲基溴化铵)对硅藻土进行改性, 并以优选的改性方案为基础, 研究了该有机硅藻土对水中有机氯农药DDTs(p, p'-DDT、p, p'-DDE和p, p'-DDD)的吸附过程及增强机理.结果表明, 十六烷基三甲基溴化铵能有效改变硅藻土的Zeta电位、比表面积和表面疏水性质, 从而提高硅藻土吸附有机氯农药的能力.改性硅藻土对水中3种有机氯农药的吸附能力依次为: p, p'-DDT>p, p'-DDE>p, p'-DDD.基于模型的准确性(R2值)考虑, Redlich-Peterson方程能更好地用于拟合DDTs在改性硅藻土上的等温吸附曲线.
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| 关 键 词： | 硅藻土 有机改性 吸附 有机氯农药 |
| 收稿时间： | 2011-07-23 |
Removal of DDTs from Water by Modified Diatomite |
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| Abstract: | This study investigates the adsorption behavior of organochlorine pesticides DDTs (p, p'-DDT, p, p'-DDE and p, p'-DDD) onto organo-diatomite (OD), which was modified by Cetyltrimethylammonium Bromide (CTMAB). The strengthen mechanisms and optimization design of the adsorption process are also discussed. The results show that the cationic surfactant could change the Zeta potential, BET surface area and hydrophobic characteristics of diatomite, which lead to the better adsorption efficiency of DDTs. The adsorption efficiency of the three DDTs onto OD follows the order of p, p'-DDT > p, p'-DDE > p, p'-DDD. According to the value of R2, it can be concluded that the Redlich-Peterson model fit best for the adsorption data. |
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