8th International Scientific Conference on Modern Management of Mine Producing, Geology and Environmental Protection, Sofija, Bulgaria, 16 - 20 June 2008, pp.407-411
In this study, removal zinc from aqueous solution was studied using smectite-bearing soil. The effects of initial Zn(II) concentration, pH, adsorbent dosage, and contact time were investigated. When the initial concentration of Zn(II) was increased from 0.7 to 3.77 mM, the Zn(II) removal efficiency decreased from 100% to 90.7%. To determine the effect of pH on the adsorption efficiency of Zn(I I), pH was varied between 3.0 and 7.0. The sorption efficiency of Zn(II) onto soil seems to be independent of pH with in studied pH range and initial Zn(II) concentration. When soil was treated with 1.23 mM Zn(II) solution, the sorption efficiency was determined as 96% at all pH values tested. As the dosage of soil was increased from 0.3 g to 1.5g, the Zn(II) removal efficiency was almost constant at higher dosages than 0.5 g. Finally, the ability of soil to remove Zn(II) from aqueous solutions has been investigated in batch reactor with a maximum contact time of 180 min.