Abstract
The influence of 2,2′-bipyridine (bipy) on adsorption of zink ions onto a highly dispersed silica surface has been studied. The enhanced adsorption of zink ions onto silica surface from the solution containing 2,2′-bipyridine is explained by ternary surface complex formation, {≡SiOH−mZn(bipy)n(2−m)+}. The adsorbed Zn2+ and bipy concentrations were measured at the adsorption from solutions with different ratios of Zn : bipy. The equilibrium reaction constants of binary and ternary complexes have been calculated using the constant capacitance model. The potentiometric titration data were used in order to determine the H+/Zn2+ exchange stoichiometry. The composition of formed surface complexes has been confirmed with their UV absorption spectra.
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