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      Cadmium removal from single- and multi-metal () solutions by sorption on hydroxyapatite

      , ,
      Journal of Colloid and Interface Science
      Elsevier BV

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          Abstract

          Heavy metal contamination of waters and soils is particularly dangerous to the living organisms. Different studies have demonstrated that hydroxyapatite has a high removal capacity for divalent heavy metal ions in contaminated waters and soils. The removal of Cd from aqueous solutions by hydroxyapatite was investigated in batch conditions at 25+/-2 degrees C. Cadmium was applied both as single- or multi-metal (Cd + Pb + Zn + Cu) systems with initial concentrations from 0 to 8 mmol L(-1). The adsorption capacity of hydroxyapatite in single-metal system ranged from 0.058 to 1.681 mmol of Cd/g of hydroxyapatite. In the multi-metal system competitive metal sorption reduced the removal capacity by 63-83% compared to the single-metal system. The sorption of Cd by hydroxyapatite follows the Langmuir model. Cadmium immobilization occurs through a two-step mechanism: rapid surface complexation followed by partial dissolution of hydroxyapatite and ion exchange with Ca resulting in the formation of a cadmium-containing hydroxyapatite.

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          Author and article information

          Journal
          Journal of Colloid and Interface Science
          Journal of Colloid and Interface Science
          Elsevier BV
          00219797
          January 2008
          January 2008
          : 317
          : 2
          : 402-408
          Article
          10.1016/j.jcis.2007.09.075
          17949731
          8d7a5cd0-624c-4729-b06f-028c0590349b
          © 2008

          https://www.elsevier.com/tdm/userlicense/1.0/

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