Abstract
Batch equilibrium experiments were carried out to investigate the single and combined effect of cadmium and Tween80 on the sorption of DDT. The results indicate that in the binary system of Tween80-DDT, when initial Tween80 concentration is below its CMC (critical micelle concentration, 15.7 mg/L), the sorption of DDT is promoted; as the initial Tween80 concentration increasing to slightly higher than its CMC, DDT adsorption amount is rather the same as that of CK (control check); and when initial Tween80 concentration is much more than its CMC, the sorption of DDT is inhibited. As to binary system of cadmium-DDT, coexistent heavy metal salt inhibits the sorption of DDT. The inhibition is mainly caused by the competitive adsorption of Cd2+, and anion Cl− and have little effect. Moreover, the coexistence of Tween80 and Cd2+ makes the competitive adsorption more obvious, which inhibits the sorption of DDT. The combined effect of coexistent Tween80 and cadmium on the sorption of DDT is proved to be an antagonism effect, which has a more significant influence on the adsorption amount than that in binary system, and the antagonism effect becomes gradually insignificant with the increasing concentration of coexistent pollutant.
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