2,4-二氯苯酚在松花江沉积物上的吸附解吸

Adsorption and desorption of 2,4-Dichlorophenol (2,4-DCP) on the sediment of Songhua River

摘要:

在松花江3个典型断面(哈尔滨、达连河和佳木斯)采集了3类不同性质的沉积物,分别研究了2,4-二氯苯酚在松花江沉积物上的吸附-解吸特性.结果表明:2,4-二氯苯酚在3种沉积物上的吸附在24h内均可达到吸附平衡,其吸附-解吸过程符合Freundlich方程(R2>0.92).在3类沉积物样品上的吸附作用强度大小依次为佳木斯沉积物>达连河沉积物>哈尔滨沉积物.2,4-二氯苯酚在3种沉积物上吸附-解吸滞后系数(HI)都小于1,说明2,4-二氯苯酚的解吸行为存在较为明显的滞后现象,HI值大小依次为:哈尔滨>达连河>佳木斯.HI值与沉积物理化性质成正相关(R2>0.444).

Abstract:

In this paper,the batch isotherm experiments were performed to study the characteristics of adsorption and desorption of 2,4-DCP on three sediments with different physical-chemical characters,which were collected from the Songhua River in Harbin,Dalianhe and Jiamusi. Experimental results demonstrate that the adsorption of 2,4-DCP in three sediments can be completely balanced in 24 h. The adsorption isotherm is nonlinear and fitted with the form of the Freundlich equation under experimental condition(R2 >0. 92). The adsorption capacity of sediment follows the order: Jiamusi sediment > Dalianhe sediment > Harbin sediment. The value of HI follows the order: Harbin sediment > Dalianhe sediment > Jiamusi sediment. The desorption process of 2,4DCP has an obvious hysteresis,and all of them are less than 1. Furthermore,the co-relationship between HI and the physical-chemical characters of sediment is positive(R2 >0. 444).