Special Articles: Environmental Sciences and Analytical Chemistry. Modeling of divalent heavy metal ion adsorption on the surface of iron(III) oxide particles.

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  • TAMURA Hiroki
    Research Group of Materials Chemistry, Faculty of Engineering, Hokkaido University
  • OKITA Koji
    Research Group of Materials Chemistry, Faculty of Engineering, Hokkaido University
  • KATAYAMA Noriaki
    Asahikawa National College of Technology
  • FURUICHI Ryusaburo
    Research Group of Materials Chemistry, Faculty of Engineering, Hokkaido University

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Other Title
  • 特集　環境科学と分析化学　酸化鉄（ＩＩＩ）粒子表面への二価重金属イオン吸着反応のモデル化
  • サンカ テツ 3 リュウシ ヒョウメン エ ノ 2カ ジュウキンゾク イオン
  • 酸化鉄(III)粒子表面への二価重金属イオン吸着反応のモデル化

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Abstract

Soils and sediments contain metal oxide particles and control the concentration of heavy metal ions in natural waters at low levels by adsorption. The adsorption isotherms of divalent heavy metal ions on the surface of iron(III) oxide particles were obtained, and modeling of the adsorption reaction was made to describe and predict water quality. The model assumes (1) surface complex formation due to the (1:1) and (1:2) cation exchange reactions with protons of acid surface hydroxyl sites and (2) suppression of the reactions by a linear increase in the Gibbs free energy change (ΔG) with the surface coverage. From the model parameters, it was found that the adsorption affinity increases in the order: Co2+≤Zn2+< Cu2+<Pb2+. There was a good correlation between the stabilities of surface complexes and hydroxo complexes for these ions. This supports the surface complexation model which assumes that metal ion adsorption is due to the donation of electron pairs from the lattice oxide ions to the metal ion.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 43 (11), 831-836, 1994

    The Japan Society for Analytical Chemistry

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