2,4-二氯苯酚在土壤中的吸附及其批实验与柱实验的分配系数比较  

Sorption of 2,4-dichlorophenol in soil and comparison of partition coefficients obtained by batch and column experiments

作　　者：张建明[1] 彭胜[1] 陈家军[1] 

机构地区：[1]北京师范大学环境学院环境模拟与污染控制国家重点联合实验室

出　　处：《环境工程学报》2012年第11期4251-4256,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(40902072)

摘　　要：为了研究2,4-二氯苯酚在土壤中的吸附及比较其批实验与柱实验的分配系数Kd,开展了2,4-二氯苯酚的批实验(不同液固比条件下)和柱实验。通过分析结果可知,在批实验中,不同液固比条件下2,4-二氯苯酚达到平衡的时间类似,都在60～70 h,吸附动力学曲线符合伪二级动力学方程,吸附规律是:液固比越大,平衡吸附量增大,反应速率常数K2减小,初始吸附速率常数减小;Kd随液固比增大而降低,范围在2.91～2.12 L/kg。柱实验结果表明,2,4-二氯苯酚的贯穿曲线可以很好地用化学非平衡模型来拟合,通过模型拟合得到的Kd值要低于批实验的结果。该研究对表征2,4-二氯苯酚在环境中的行为、预测其对土壤和地下水的污染及其治理提供了依据。The batch and column experiments were conducted to preliminarily study the adsorption of 2,4-dichlorophenol in soil and compare the partition coefficients.The results of batch experiment showed that 2,4-dichlorophenol reached equilibrium after 60~70 hrs for all liquid/solid ratios.The sorption kinetic curves could be fitted by Pseudo-second order model.The equilibrium adsorption capacity increased as the liquid/solid ratios rised,while the rate constant K2 and the initial rate constant decreased.The adsorption isotherms could be fitted by the linear and Freundlich models.The Kds decreased as the liquid/solid ratios increased,ranging from 2.91 to 2.12 L/kg.The column experiment showed that the breakthrough curve could be well described by chemical non-equilibrium model.The Kd was lower than that from batch experiment.All these results provide a theoretical basis for characterizing the behavior and pollution of 2,4-dichlorophenol in soil and groundwater.

关 键 词：2 4-二氯苯酚 吸附 批实验 柱实验 

分 类 号：X53[环境科学与工程—环境工程]