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.
出处
《环境工程学报》
CAS
CSCD
北大核心
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)
关键词
2
4-二氯苯酚
吸附
批实验
柱实验
2
4-dichlorophenol
adsorption
batch experiment
column experiment
