Mechanism of Adsorption of Mercury(II) Ion on Activated Carbon

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  • 活性炭による水銀(II)イオンの吸着機構
  • 活性炭による重金属イオンの吸着　Ｉ　　活性炭による水銀（ＩＩ）イオンの吸着機構

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The mechanism of adsorption of the Hg (II) ion on activated carbons (prepared from coal by steam activation method) has been studied. The following conclusions were obtained from the effects of pH, anions, foreign metallic ions and temperature on adsorption of the Hg (II) ion and the desorption of mercury from activated carbon.<BR>(1) The Hg(II) ion is adsorbed very efficiently on activated carbon in a HCl acidic medium (pH 1-4).<BR>(2) Adsorbability of Hg (II) on activated carbon is improved by the addition of halide ions. The order of this improving effects of halide ions is F- < Cl- < Br- < I-. This order is the same as that of the stability constants of HgX42- complexes and indicates that Hg(II) is adsorbed very well on activated carbon in the form of the HgX42- complex.<BR>(3) Mechanisms of adsorption of Hg( II ) in an acid ic (HC1) and an alkaline (NaOH)medium differ from one another. In an acidic medium, the HgCl42- complex is reversibly adsorbed on activated carbon. On the other hand, the adsorption of Hg(II) in an alkaline medium is irreversible. In an alkaline medium Hg (II) is considered to be adsorbed on activated carbon in the forms of Hg(OH)2 and Hg metal which is generated by the reduction of Hg(II) the surface of activated carbon. If I- is present in the Hg( II) solution, Hg(II) is adsorbed very well in the form of HgI42- even in an alkaline medium.<BR>(4) Mercury adsorbed on activated carbon in a HCl acidi c medium is easily eluted with a dilute aqueous solution of sodium hydroxide.<BR>(5) The adsorption of Hg (II) on activate d carbon in a HC1 acidic medium is little affected by the addition of Na+, Ca2+ and Fe3+ even if the amount of these metallic ions are 100 times that of Hg (II).

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1976 (5), 808-813, 1976-05-10

    The Chemical Society of Japan

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