Simultaneous Adsorption of Trichloroethylene and Cadmium on Attapulgite in the Groundwater

The adsorption of trichloroethylene (TCE) and Cd 2+ combined contamination in the groundwater by attapulgite were studied, and the effects of pH, dosage of attapulgite and adsorption time on adsorption were investigated, equilibrium of the adsorptions processes were further conducted. Results showed that the adsorption rate of TCE affected little by the pH; TCE adsorption equilibrium reached after 3d, the removal rate was 71.34%; when attapulgite dosage was 0.03g, the adsorption rate was up to more than 51.08%. Freundlich isotherm was best fitted the adsorption process of TCE. Compound contamination of TCE and Cd 2+ decreased the removal rate of TCE; but was in line with Freundlich adsorption isotherm.