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The ability of chitosan as an adsorbent for Cu (II) and Cr (VI) ions in aqueous solution was studied. The experiments were don e as batch processes. Equilibrium studies were done on both cross-linked and non-cross-linked chitosan for both metals. Cr (VI) adsorption behaviour could be described using the Langmuir isotherm over the whole concentration range of 10 to 1000 mg· l -1 Cr. The maximum adsorption capacity for both types of chitosan was found to be 78 mg·g -1 for the non-cross-linked chitosan and 50 mg·g -1 for the cross-linked chitosan for the Cr (VI) removal. For the Cu (II) removal the Freundlich isotherm described the experimental data over the whole concentration range of 10 to 1000 mg·l-1 Cu (II). The maximum adsorption capacity for both types of chitosan can be estimated to be greater than 80 mg·g -1 . Cr (VI) removal was the highest at pH 5 but pH did not have a large influence on Cu (II). From these results it is clear that the adsorption of heavy metals is possible with chitosan, but that with this m ethod, end concentrations of below 1 mg·l-1 can hardly be obtained.

Adsorption of Cu(II) and Cr(VI) ions by chitosan: kinetics and equilibrium studies