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

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, 4-DCP 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).