Pb(II) biosorption using chitosan and chitosan derivatives beads:Equilibrium, ion exchange and mechanism studies
W. S. Wan Ngah , S. Fatinathan
DOI:
Received May 04, 2009,Revised August 27, 2009, Accepted , Available online
Volume 22,2010,Pages 338-346
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The study examined the adsorption of Pb(II) ions from aqueous solution onto chitosan, chitosan-GLA and chitosan-alginate beads.
Several important parameters influencing the adsorption of Pb(II) ions such as initial pH, adsorbent dosage and di erent initial
concentration of Pb(II) ions were evaluated. The mechanism involved during the adsorption process was explored based on ion
exchange study and using spectroscopic techniques. The adsorption capacities obtained based on non–linear Langmuir isotherm for
chitosan, chitosan-GLA and chitosan-alginate beads in single metal system were 34.98, 14.24 and 60.27 mg/g, respectively. However,
the adsorption capacity of Pb(II) ions were reduced in the binary metal system due to the competitive adsorption between Pb(II) and
Cu(II) ions. Based on the ion exchange study, the release of Ca2+, Mg2+, K+ and Na+ ions played an important role in the adsorption
of Pb(II) ions by all three adsorbents but only at lower concentrations of Pb(II) ions. Infrared spectra showed that the binding between
Pb(II) ions and the adsorbents involved mostly the nitrogen and oxygen atoms. All three adsorbents showed satisfactory adsorption
capacities and can be considered as an e cient adsorbent for the removal of Pb(II) ions from aqueous solutions.
