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

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.