Prediction of adsorption of divalent heavy metals at the goethite/water interface by surface complexation modeling

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1002/etc.5620141210· OSTI ID:162953

Kooner, Z S; Cox, C D; Smoot, J L ^[1]

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1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Civil and Environmental Engineering

The triple-layer model was used to model the adsorption behavior of Cu(II), Pb(II), and Zn(II) onto goethite as a function of pH, total dissolved metal (Me) concentration, surface area, and ionic strength. A single reaction involving adsorption of Me{sup 2+} onto negative surface sites as an inner-sphere complex proved successful in describing adsorption of all three metals under the experimental conditions. The calibrated model was validated by comparing model predictions to independent data reported in the literature. A linear-free-energy relationship between the intrinsic surface complexation and the first-hydrolysis equilibrium constants was determined and was used to predict the intrinsic surface complexation constants for Co(II) and Hg(II). The triple-layer model, using the predicted constants, quantitatively described the adsorption of Co(II), but significantly overpredicted the extent of Hg(II) adsorption.

• Sponsoring Organization: USDOE
• OSTI ID: 162953
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 12 Vol. 14; ISSN 0730-7268; ISSN ETOCDK
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION
COPPER
FORECASTING
LEAD
MATHEMATICAL MODELS
WATER CHEMISTRY
ZINC