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Bioinorganic Chemistry and Applications
Volume 2009, Article ID 901563, 7 pages
Research Article

Adsorption of Pb(II) and Cd(II) by Squid Ommastrephes bartrami Melanin

1College of Food Science and Technology, Ocean University of China, Qingdao, Shandong 266003, China
2Department of Food Science and Technology, Oregon State University, Corvallis, OR 97331-4501, USA

Received 15 June 2009; Revised 28 September 2009; Accepted 30 October 2009

Academic Editor: Triantafillos Albanis

Copyright © 2009 Shiguo Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The adsorption of Cd(II) and Pb(II) by squid melanin was investigated. At a metal ion concentration of 2 mM/L, the biosorption efficiency of melanin reached 95% for Cd(II) and Pb(II). The maximum content of bound Cd(II) and Pb(II) was 0.93 mM/g and 0.65 mM/g, respectively. Temperature had no obvious effect on the adsorption of the metals, and in a pH range of 4.0–7.0, the adsorption yield was high and stable. Macrosalts such as NaCl, , and had no obvious effect on the binding of Pb(II) but greatly diminished the adsorption of Cd(II), which indicated that different functional groups in squid melanin are responsible for their adsorption. IR analysis of metal ion-enriched squid melanin demonstrated that the possible functional groups responsible for metal binding were phenolic hydroxyl (OH), carboxyl (COOH), and amine groups (NH). This study reports a new material for the removal of heavy metals from low-strength wastewater.