Abstract:

The adsorption of Tween80 onto soils and their component samples (S1,S2,S3,S4), and effect of the environmental influencing factors on it were studied by the batch equilibration method, and the adsorption mechanisms of Tween80 were also investigated in this study. The experimental results show that the adsorption of Tween80 on the original soil samples (S1,S2) and their respective organicmatterextracted soil samples (S3,S4) increased with the increase of the equilibrium concentration of Tween80 andgradually tended to equilibrium. The isotherms of it fitted to the Langmuir equation better. The organic matter and minerals of soils were important components to adsorb Tween80, the soil minerals had a stronger affinity for Tween80, and the adsorption of Tween80 was mainly depended on their combination. The adsorption amount of Tween80 on soil and their component samples increased with the increase of its initial concentration and temperature, but decreased with pH increasing. And the adsorption maximum capacities of soil and their component samples under the same condition followed the order of S4>S3>S1>S2.

Key words: soil, soil compontent, surfactant, Tween80, adsorption