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Influence of the pH on Distribution of Denim Blue in Water Fe-Zeolitic Tuff System

In the present study, the processes of adsorption of denim blue by Fe-zeolitic tuff from aqueous solutions at different pH values were determined. The parameters, Kd(n), Kd(i), Φn, pKa were accurately predicted by applying the linear model to sorption isotherms at different pH values of denim blue. Maximum removal of denim blue was observed at pH values between 3 and 5, where neutral species are the main components of the solution. The results indicate that pH has a pronounced effect on denim blue sorption depending on the conditions of the system.