金属酸化物表面への重金属イオン交換吸着反応のモデリング(<特集>:分離(その1))(抽出・吸着分離)

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タイトル別名
  • Modeling the ion-exchange adsorption of heavy metal ions on the surface of metal oxides.
  • 金属酸化物表面への重金属イオン交換吸着反応のモデリング
  • キンゾク サンカブツ ヒョウメン エ ノ ジュウキンゾク イオン コウカン キ

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The ion-exchange adsorption of heavy metal ions (Cu2+, Mn2+, Co2+, Zn2+, and Ni2+) on metal oxides (MnO2, Fe3O4, and Al2O3) was modeled so as to enable a description and prediction of the amount of adsorption as a function of the ion concentration, exchange-site density, and solution pH. The model assumes that heavy metal ions are adsorbed through (1 : 1) and (1 : 2) ion-exchange reactions with the protons of the acid-type surface hydroxyl groups on metal oxides (-OH(a)), and that each exchange reaction is steadily suppressed along with the progress in ion exchange due to electrostatic lateral interactions between the species in the solid/solution interphase. The equilibrium conditions of the (1 : 1) and (1 : 2) exchange reactions are given by : K1°=K1exp(B1 θ1) and β2°=β2exp(B2θ2), where K1° and β2° are the equilibrium constants, K1 and β2 the concentration ratios, B1 and B2 the suppression constants, and θ1 and θ2 the coverages of the exchange sites. The values of K1°, β2°, B1, and B2 were determined by fitting the model equations to the experimental adsorption isotherms. With the established constants the fractions of adsorbed ions were calculated as a function of the pH for given concentrations of added metal ions and metal oxides. From the calculations, the adsorption affinity order of ions for MnO2 is Cu2+ >Mn2+ >Co2+ >Zn2+ >Ni2+, and the Co2+ adsorption ability order of oxides is MnO2>Fe3O4>Al2O3.

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  • 分析化学

    分析化学 42 (11), 719-724, 1993

    公益社団法人 日本分析化学会

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