Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 77, Issue 2, Pages 85-92Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2005.01.028
Keywords
Chlamydomonos reinhardtii; algae; biosorption; kinetic characterization; Hg(II); Cd(II); Pb(II); heavy metal; FT-IR
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The microalgae Chlamydomonas reinhardtii was used for the biosorption of Hg(II), Cd(II) and Pb(II) ions. The maximum adsorption of Hg(II) and Cd(II) ions on Chlamydomonas reinhardtii biomass was observed at pH 6.0 and the corresponding value for Pb(II) ions was 5.0. The biosorption of Hg(II), Cd(II) and Pb(II) ions by microalgae biomass increased as the initial concentration of Hg(II), Cd(II) and Pb(II) ions increased in the biosorption medium. The maximum biosorption capacities of microalgae for Hg(II), Cd(II) and Pb(II) ions were 72.2 +/- 0.67, 42.6 +/- 0.54 and 96.3 +/- 0.86 mg/g dry biomass, respectively. The affinity order for algal biomass was Pb(II) > Hg(II) > Cd(II). FT-IR analysis of algal biomass revealed the presence of amino, carboxyl, hydroxyl and carbonyl groups, which were responsible for biosorption of metal ions. Biosorption equilibrium was established in about 60 min and the equilibrium was well described by the Freundlich biosorption isotherms. Temperature change in the range of 5 - 35 degrees C did not affect the biosorption capacity. The microalgae could be regenerated using 0.1 M HCl, with up to 98% recovery, which allowed the reuse of the biomass in six biosorption-desorption cycles without any considerable loss of biosorption capacity. (c) 2005 Elsevier Ltd. All rights reserved.
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