Analysis of adsorption behavior of cations onto quartz surface by electrical double-layer model

In a study of the adsorption behavior of cations onto quartz, the distribut ion coefficient of a variety of cations was determined using the batch meth od, and using the titration method, the surface charge densities of quartz in a number of electrolyte solutions. The two values thus determined were a nalyzed applying the electrical double-layer model, from which optimum para meter values were derived for double-layer electrostatics and intrinsic ads orption equilibrium constants. Based on these parameter values, the mechani sm of cation adsorption is discussed: A key factor governing this mechanism proved to be the hydration behavior of cations. Consideration of the Coulo mb interaction between the adsorbate ions and adsorbent surface led to the finding of a simple rule governing in common the adsorption equilibrium con stants of different metal ions.