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Clays and Clay Minerals

, Volume 27, Issue 6, pp 411–416 | Cite as

Effect of Ionic Strength and Ion Pair Formation on the Adsorption of Nickel by Kaolinite

  • Shas V. Mattigod
  • A. S. Gibali
  • A. L. Page
Article

Abstract

Adsorption of Ni(II) by Ca- and Na-saturated kaolinites was studied in equilibrating solutions with total Ni concentrations ranging from 118 to 946 μg/liter. Background electrolytes used in these experiments were 0.005,0.01,0.025, and 0.5 M Ca(N03)2,0.002 and 0.005 M CaSO4, 0.01 and 0.1 M NaNO3, and 0.005 and 0.05 M Na2SO4, Ion speciation in equilibrium solutions was calculated by the computer program GEOCHEM. Computed Ni2+ concentrations and activities at equilibrium were correlated with total Ni adsorbed by kaolinite. Increasing ionic strength resulted in decreasing Ni adsorption. Adsorption of Ni was greater from solutions when NO3 was the dominant anion. Based on adsorption data in SO4 medium, the standard free energy of adsorption of Ni2+ ion on kaolinite was computed to be —27 kJ/mole.

Resümee

Die Adsorption von Ni2+ durch Ca- und Na-gesättigte Kaolinite wurde in Lösungen nahe dem Gleichgewicht untersucht, die Gesamt-Ni-Konzentrationen im Bereich von 118 bis 946 μ.g/liter hatten. Als Hilfselektrolyte wurden in diesen Experimenten verwendet: 0,005, 0,01, 0,025, und 0,5 M Ca(NO3)2, 0,002 und 0,005 M CaSO4, 0,01 und 0,1 M NaNO3 sowie 0,005 und 0,05 M Na2SO4. Die Verteilung der Ionenarten in den Gleichgewichtslösungen wurde mit dem Computerprogramm GEOCHEM berechnet. Die berechneten Ni2+-Konzentrationen und -Aktivitäten bei Gleichgewicht wurden mit dem Gesamt-Ni, das durch Kaolinit adsorbiert war, korreliert. Eine zunehmende Ionenstärke bewirkt eine abnehmende Ni-Adsorption. Die Ni-Adsorption aus den Lösungen war größer, wenn NO3 das vorherrschende Anion war. Aufgrund der Adsorptionsdaten bei SO42−-Medium wurde die Freie Energie der Ni2+-Adsorption an Kaolinit mit —27 kj/mol berechnet.

Résumé

L’adsorption de Ni(II) par des kaolinites saturées de Ca et Na a été étudiée dans des solutions équilibrantes avec des concentrations totales de Ni s’étendant de 118 à 946 μg/litre. Des électrolytes de fond utilisées dans ces expériences étaient 0,005, 0,01, 0,025, et 0,5 M Ca(N03)2; 0,002 et 0,005 M CaSO4; 0,01 et 0,1 M NaNO3; et 0,005 et 0,05 M Na2SO4. La spéciation d’ions dans les solutions d’équilibre a été calculée par le programme d’ordinateur GEOCHEM. Les concentrations et activités de Ni2+ calculées à l’équilibre ont été apparentées à Ni total adsorbé par la kaolinite. La force ionique croissante a résulté en une adsorption décroissante de Ni. Lorsque NO3 était l’anion dominant dans les solutions, l’adsorption de Ni était la plus élevée. En se basant sur les données d’adsorption dans un milieu SO4, on a calculé que l’énergie libre standard d’adsorption de l’ion Ni2+ sur la kaolinite était —27 kJ/mole.

Key Words

Ion speciation Ionic strength Ion pair Kaolinite Nickel adsorption 

Резюме

Изучалась адсорбция Ni(II) каолинитами, насыщенными Са и Na, в равновесных растворах с общими концентрациями Ni, изменяющимися от 118 до 946 /иг/литр. Дополнительными электролитами, используемыми в этих экспериментах были 0,005, 0,01, 0,025; и 0,5 М Са(NO3)2; 0,002 и 0,005 М СаSO4; 0,01 и 0,1 М NaNO3; и 0,005 и 0,05 М NaSO4. Образование ионов в равновесных растворах определялось с помощью компьютерной программы ГЕОХИМ. Подсчитанные концентрации и активности Ni2+ при равновесии коррелировались с общим количеством Ni, адсорбированным каолинитом. Увеличивающаяся ионная сила вызвала уменьшение адсорбции Ni. Адсорбция Ni из растворов была больше, когда NO3 бул главным анионом. На основании данных адсорбции в среде SO4, была вычислена стандартная свободная энергия адсорбции иона Ni2+ каолинитом, равная −27 кДж/моль.

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Copyright information

© The Clay Minerals Society 1979

Authors and Affiliations

  • Shas V. Mattigod
    • 1
  • A. S. Gibali
    • 1
  • A. L. Page
    • 1
  1. 1.Department of Soil and Environmental SciencesUniversity of CaliforniaRiversideUSA

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