Adsorption of Co(II) and Cu(II) on silica gel surface modified with pyridinium ion from acetone and ethanol solutions

Abstract

Silica gel modified with pyridinium ion,  Si(CH 2) 3 ▪C 5H 5Cl − was used to adsorb metal ions from acetone and ethanol solutions. Adsorption of anionic complexes MCl n z− n ( M = Co(II) and Cu(II)) was much higher from acetone than from ethanol solution. For Co(II) the adsorbed species was the tetrahedral CoCl 4 2− complexes from both solvents while for Cu(II), the adsorbed species was CuCl 4 2− from ethanol solution and the dimeric Cu 2Cl 6 2− from acetone solution.