Adsorption and Desorption Behavior of Chemical Residues in Soils

Abstract

In order to prevent the influence of residual volatile organics from chemical plant on metro environment and population health, phenol was selected as a typical intermediate. And the adsorption and desorption of phenol in the surrounding soil of subway were investigated, which benefit for understanding pollutants transportation law and truncation of pollutants transportation. Adsorptive dynamics, adsorption-desorption behavior of phenol in soil, and the effect of different factors on adsorptive behavior were studied. The results showed that the linear adsorption equation can better meet the adsorption behavior of phenol in soil. When the equilibrium concentration was 85 mg L-1, the adsorption amount of no. 1 and no. 2 soils were 15.7 mg g-1 and 17.2 mg g-1 respectiely. And the adsorption of phenol in soils was dependent on pH and temperature. Desorption 4 h can basically achieve desorption balance, the desorption efficiency of no. 1 and no. 2 soils were 14 % and 10 % respectively. Because there is less humus in the deep soil, desorption of phenol in deep soils was weak, which maybe reduce the transportation speed of phenol in soils.