FOOD SCIENCE ›› 2012, Vol. 33 ›› Issue (23): 110-115.

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Adsorption and Mechanism of Metal Ions onto Grass Carp Scales

WANG Haibo   

  • Received:2012-06-25 Revised:2012-11-21 Online:2012-12-15 Published:2012-12-12
  • Contact: WANG Haibo E-mail:wanghaibo818@hotmail.com

Abstract: In this study, fish scale adsorbent was prepared from grass carp scales and comparatively investigated for its effectiveness in adsorbing several metal ions. The optimal conditions for Cu2+ adsorption by the adsorbent were studied and the mechanism of adsorption was explored by kinetic and thermodynamic analysis and infrared (IR) spectroscopy. The adsorbent had good adsorption capacity for different metal ions and its adsorption capacity followed the decreasing order: Cu2+ > Zn2+ >Co2+ > Mn2+ > Cr2+. The best adsorption results were obtained by using an adsorbent dose of 1.25 g/L to adsorb Cu2+ at an initial concentration of 200 μg/mL and pH 4 under room temperature conditions. Kinetic and thermodynamic analysis indicated that the adsorption of Cu2+ by the adsorbent was a multilayer process consisting of physical and chemical reactions and could be enhanced at higher temperatures, and the dynamic adsorption behavior could be well described by quasi-second-order kinetic model. IR spectroscopic analysis showed that the main functional groups in the fish scale adsorbent involved in adsorbing Cu2+ were amino, carboxyl, phosphate and carbonate groups, which were from rotein and hydroxyapatite, respectively.

Key words: grass carp scales, metal ions, adsorption capacity, mechanism

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