Adsorption Affinity of Divalent Heavy Metal Ions for Metal Oxides Evaluated by Modeling with the Frumkin Isotherm

Journal of Colloid and Interface Science
H Tamura, R Furuichi

Abstract

Adsorption of divalent heavy metal ions, M(II), on metal oxides is important to determine the behavior of ions in waters and soils. The amount of adsorbed Pb(II), Cu(II), Zn(II), Co(II), Ni(II), and Mn(II) ions on the two oxides MnO2 and Fe2O3 was measured as a function of the pH and concentration of the ions under the conditions where no mono- and polynuclear hydroxo complexes play a role in the adsorption. The adsorption affinity of these ions for the oxides was evaluated with a model that considers simultaneous (1:1) and (1:2) exchange reactions between M2+ aqua ions and surface hydroxyl protons (surface complexation) obeying the Frumkin isotherm. From the model parameters, it was found that the affinity order for (1:1) complex formation is Cu2+ > Mn2+ > Zn2+ > Co2+ > Ni2+ for MnO2 and Pb2+ > Cu2+ > Zn2+ > Co2+ for Fe2O3. A large affinity of Mn2+ for MnO2 was ascribed to the oxidation of this ion by MnO2. A good correlation between the stability constants of (1:1) surface complexes and those of (1:1) hydroxo complexes in solution was obtained. The adsorption affinities of ions here are the affinities for deprotonated hydroxyl sites with negative charge, since for all the ions the oxides are common and the deprotonation prope...Continue Reading

Citations

Oct 29, 2004·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Yukinori TaniMitsuyuki Soma
Jul 8, 2011·Journal of Hazardous Materials·Ghasem ZolfaghariAli Ghafari-Nazari
Nov 26, 2010·The Science of the Total Environment·Leslie L BakerKenneth F Sprenke
Sep 24, 2004·Journal of Colloid and Interface Science·Hiroki Tamura
Dec 6, 2005·Advances in Colloid and Interface Science·Tushar Kanti Sen, Kartic C Khilar
Jun 21, 2005·Journal of Colloid and Interface Science·O S PokrovskyR Freydier
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May 1, 1999·Journal of Colloid and Interface Science·R Weerasooriya, H U Wickramarathna
Dec 10, 1998·Journal of Colloid and Interface Science·I Larson, R J Pugh
Jan 8, 1999·Journal of Colloid and Interface Science·H TamuraR Furuichi
Jan 13, 2014·Materials·George Z Kyzas, Margaritis Kostoglou
Nov 21, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Louise J CriscentiDavid Hart

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