Adsorption equilibrium of zinc ions from aqueous sulfate solution on Amberlite XAD-2 resins impregnated with extractant Cyanex 272 as adsorbent has been studied. The effect of parameters such as modifier addition, solution pH, ionic strength, and temperature on the sorption equilibrium was examined by batch experiments. The activity coefficient of various species in the aqueous solution was evaluated by employing Bromley and Pitzer equations for the strong electrolyte solutions. The adsorption was also conducted in a column operation. The loaded Zn in the column can be completely and rapidly recovered by stripping with 1.0 M HNO3.