Adsorption of gold(III) and thallium(III) on .BETA.-cyclodextrin polymer from hydrochloric acid solution.

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Adsorption of chloro-complexes of metals on a commercially available β-cyclodextrin polymer was investigated. Gold(III) and thallium(III) were efficiently adsorbed from the solutions of low hydrochloric acid concentration, while iron(III), gallium(III) and antimony(V) were adsorbed from the solutions of high chloride concentration (hydrochloric acid or lithium chloride). The capacities of the polymer were 0.4-0.6mmol g-1 for gold(III), thallium(III) and iron(III). Microgram amounts of thallium(III) could be separated from large amounts of iron(III) by using the polymer column. In addition, conditional formation constants for 1:1 complexes of β-cyclodextrin with chloro-complexes of gold(III), thallium(III) and iron(III) were determined spectrophotometrically.
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