Removal of Zn (II) ions was investigated from aqueous solution using the leaves of Araucaria cookii. The factors influencing Zn (II) ion adsorption were pH, contact time, and adsorbent mass and metal ion concentration. Maximum adsorption of Zn (II) ions was at pH 9, contact time of 70 min, adsorbent mass of 2g, and ion concentration of 200 ppm with agitation speed of 200 rpm. Maximum uptake of bio sorbent was 97.9%. Using contact time pseudo first order and pseudo second order reactions were studied. Isotherm investigations were studied using Langmuir and Freundlich equations.
