ferro-precipitate; adsorption; heavy metals; zeta potential

. The main aim of the paper is to evaluate ferro-precipitate as immobilization agent for removing heavy metals from aqueous solutions. Lead, cooper and chromium were used as model metals. The simultaneous measurements of the heavy metals adsorption and zeta potential determination of the (adsorption) suspensions were carried out. The adsorption isotherms were found to be of typical Langmuir type; values of the heavy metals adsorption capacities have been calculated (am = 0.76 mmol g-1 for lead, 0.58 mmol g-1 for cooper, 0.38 mmol g-1 for chromium, respectively). Shape of the adsorption isotherms was correlated with zeta potential values at the adsorption equilibrium. Addition of the heavy metals ions affects the value of ?- potential, making the zeta potential values more positive.