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ABSTRACT
The ion exchange behavior of a sulfur-modified biotite towards Pb2+, Hg2+, Co2+, Cu2+, Cd2+ and Zn2+ ions has been studied. The ion exchange isotherms of divalent cations were determined and concentration equilibrium constants as a function of metal loading were analyzed. Sulfur modified biotite exhibits high affinity for Hg2+, Pb2+, Cu2+ and Cd2+ ions in individual solutions and in the presence of electrolytes. About 200 mg Hg/g uptake in 1·10−3 M Hg2+ solution and ∼ 35 mg Hg/g in groundwater simulant or an alkaline simulant 2 M in NaN03 + 1 M in NaOH was found. The possibility of a complex ion exchange and precipitation mechanism of the sulfur modified biotite towards the soft cations is proposed.