摘要：Tea saponin (TS) is a type of tea seed-derived natural surfactant. Two types of cadmium contaminated soilswere washed with TS in batch experiments. The results showed that TS was effective for removal of cadmiumfrom the two soils, and attained 74.5% and 64.6% of cadmium desorption by 8% of TS, respectively. Theoptimum concentration of TS for soil washing to remove cadmium is 4% under the consideration both ofefficiency and cost. The addition of background electrolyte (NaNO 3 ) resulted in a significant increase of thedesorption of cadmium by TS. Kinetic studies revealed that the desorption of cadmium by TS was fast, theequilibrium reached at 20 min of contact in the two tested soils. The kinetic data were fitted to the pseudo-second-order kinetic model very well. TS displayed a promising desorption capacity for cadmium in pollutedsoils.
