ADSORPTION OF Cu (II) IONS FROM WASHING SOLUTIONS OF TAILINGS BY DOWEX MAC-3 H+ SORBENT

Abstract

In this article, the experimental results of the adsorption of Cu2+ ion with Dowex Mac-3H+, a cation exchange resin with weak acid character, were investigated. Factors affecting the adsorption of copper ions from sulfated solutions: the initial concentration of Cu2+ ion, the dose amount of the adsorbent, the concentration-time, and the pH of the solution were studied. The obtained results showed that Dowex Mac-3H+ resin shows a high volume capacity (322.6 mg/g) in the separation of Cu2+ ions from sulfated solutions. At the initial concentration of 0.5 g/l, for 4 hours, when 0.2 g of sorbent was taken, at pH 6, at room temperature, the adsorption rate of Cu2+ ions was maximal (98%). In the first 1 hour, sorption occurs at a high rate, and increasing the contact time does not affect the process much. Due to the increase in the concentration of OH- ions at higher pH values, it is observed that the Cu2+ ion changes to the Cu(OH)2 precipitate form. The values of the obtained experimental results fully correspond to the Langmuir and Freundlich isotherms. It can be seen from the adsorption isotherms of the Langmuir and Freundlich model that the adsorption of Cu2+ ions on the resin occurs according to the chemisorption mechanism