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

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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.

収録刊行物

  • 分析化学

    分析化学 43 (11), 831-836, 1994

    公益社団法人 日本分析化学会

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