In this paper, study of the biosorption of Cd2+ and Pb2+ by nonliving Laminaria japonica in a batch adsorption system is described. The content of acidic sites and the dissociation constant of carboxylic acid functional groups (metal-binding site) of L. japonica were experimentally determined by conductometric and potentiometric titrations and theoretically predicated by using monodentate and bidentate binding models. The models are based on the monodentate or bidentate binding reactions of bivalent metal ions to acidic sites. The acidic site content and carboxylic acid dissociation constants determined are 1.25 and 0.18 mmol L−1, respectively. The results showed that the bidentate adsorption model fits well the biosorption of bivalent metal ions onto L. japonica with the bidentate binding constants for Cd2+ and Pb2+ being 5.72 × 103 and 6.24 × 104 L mol−1, respectively. The adsorption process of L. japonica followed the pseudo-second-order kinetics.
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April 01 2012
Biosorption of heavy metals onto nonliving Laminaria japonica Available to Purchase
Jun Xiao;
Jun Xiao
1College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China
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Miyamoto Chikanori;
Miyamoto Chikanori
2Graduate School of Fisheries Science, Division of Marine Life Science, Hokkaido University, Japan
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Ke-Feng Yu;
Ke-Feng Yu
1College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China
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Seki Hideshi;
Seki Hideshi
2Graduate School of Fisheries Science, Division of Marine Life Science, Hokkaido University, Japan
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Maruyama Hideo;
Maruyama Hideo
2Graduate School of Fisheries Science, Division of Marine Life Science, Hokkaido University, Japan
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Pei-Min He
1College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China
E-mail: [email protected]
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Water Sci Technol (2012) 65 (8): 1514–1520.
Article history
Received:
July 27 2011
Accepted:
December 12 2011
Citation
Jun Xiao, Miyamoto Chikanori, Ke-Feng Yu, Seki Hideshi, Maruyama Hideo, Pei-Min He; Biosorption of heavy metals onto nonliving Laminaria japonica. Water Sci Technol 1 April 2012; 65 (8): 1514–1520. doi: https://doi.org/10.2166/wst.2012.042
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