earticle

영어

This study demonstrates the ability of metals uptake by bacterial biosorbents immobilized in cross-linked chitosan fiber and the competition among metals in ternary metals system containing Pd(II), Rh(III) and Pt(IV). Batch experiments were performed with mixed metals solution in 0.1 M HCl, where metals exist as anionic chlorometal complexes. Langmuir and pseudo-first-order models were used to optimize the batch experiments. The maximum uptakes of Pd(II), Rh(III) and Pt(VI) were estimated to be 45.52, 23.96 and 37.78 mg/g, respectively. The rank of sorption uptake rate in mixed metals solutions was Pd(II) > Pt(IV) > Rh(III). The adsorption time for equilibrium was 90, 60 and 40 min, for Pd(II), Pt(IV) and Rh(III), respectively. In adsorption kinetic experiment, the equilibrium uptakes of Pd(II), Rh(III) and Pt(IV) were predicted to be 27.42, 4.76 and 15.29 mg/g, respectively. Desorption kinetic study with thiourea solution as an eluent revealed that Pd(II) could be eluted very easily within 20 min while Pt(IV) within 60 min. Only 64.79 and 49.20% desorption efficiency of Pd(II) and Pt(IV) were obtained, respectively. However Rh(III) could not be desorbed from the biosorbents, which was considered to be recovered by incineration of the biosorbents after removing Pd(II) and Pt(IV).