Abstract
Abstract Adsorption of 1,10-phenanthroline (phen) and its iron(II) complex (Fe(II)-phen) on octadecyl-bonded silica (ODS) gel from aqueous solution was studied by a batch method. The adsorption isotherms of phen and Fe(II)-phen were Langmiur type. Equilibrium constants for the adsorption reaction were estimated from the adsorption data in the system containing a small amount of adsorbates, in which the adsorption isotherm obeyed Henry’s law. It was clear that the adsorbed species of phen was not only the basic type but also the acidic type: protonated phen. The adsorption behavior in trace amounts (1.79 × 10−5 mol dm−3; 1 ppm) of Fe(II)-phen was analyzed by their equilibrium parameters. The distribution constants of Fe(II)-phen between ODS gel and aqueous solution were determined. The effect of co-existent anions on the adsorption of Fe(II)-phen was discussed from the obtained constants.
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