Journal ArticleDOI
Adsorption of uranyl onto ferric oxyhydroxides: Application of the surface complexation site-binding model
TLDR
In this paper, the surface complexation-site binding model of Davis et al. was used to predict uranyl adsorption from aqueous electrolyte solution onto well-characterized goethite, amorphous ferric oxyhydroxide and hematite sols at 25°C.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1985-09-01. It has received 777 citations till now. The article focuses on the topics: Uranyl carbonate & Uranyl.read more
Citations
More filters
Journal ArticleDOI
Sorption and speciation of heavy metals on hydrous Fe and Mn oxides. From microscopic to macroscopic
TL;DR: In this article, the authors describe the nature of the active site involved in the sorption process on hydrous Fe oxide and show that the size of these two surface sites are quite identical so that steric factors cannot account for the difference of sorption processes between cations and anions.
Journal ArticleDOI
Adsorption and Transport of Uranium(VI) in Subsurface Media
TL;DR: In this article, the U(VI) displacement experiments were modeled with the one-dimensional advective-dispersive equation and several different model formulations describing the interactions of U (VI) with the solid phase.
Journal ArticleDOI
Mobility and fluxes of major, minor and trace metals during basalt weathering and groundwater transport at Mt. Etna volcano (Sicily)
Alessandro Aiuppa,Patrick Allard,Walter D'Alessandro,Agnès Michel,Francesco Parello,M. Treuil,Mariano Valenza +6 more
TL;DR: In this paper, the concentrations and fluxes of major, minor and trace metals were determined in 53 samples of groundwaters from around Mt Etna, in order to evaluate the conditions and extent of alkali basalt weathering by waters enriched in magma-derived CO 2 and the contribution of aqueous transport to the overall metal discharge.
Journal ArticleDOI
Transformation of two-line ferrihydrite to goethite and hematite as a function of pH and temperature.
TL;DR: Observations suggest two-line ferrihydrite transforms to hematite via a two-stage crystallization process, with goethite being intermediary.
Journal ArticleDOI
The effect of calcium on aqueous uranium(VI) speciation and adsorption to ferrihydrite and quartz
TL;DR: In this article, the effect of Ca 2+ on U(VI) adsorption was investigated in NaNO3 solutions equilibrated with either ambient air (430 ppm CO2 )o r 2% CO 2 in the presence of 0, 1.8, or 8.9 mM Ca 2 +.
References
More filters
Journal ArticleDOI
Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits
TL;DR: The Gibbs free energies, enthalpies and entropies of 42 dissolved uranium species and 30 uranium-bearing solid phases have been critically evaluated from the literature and estimated when necessary for 25°C.
Journal ArticleDOI
Surface ionization and complexation at the oxide/water interface
TL;DR: In this article, a method for determination of intrinsic ionization and complexation constants of oxide surface sites from potentiometric titration data is reported using these experimental properties and the stoichiometry of surface reactions, surface charge, σo, adsorption density, Γi, and diffuse layer potentials, ψd, at the oxide/water interface.
Journal ArticleDOI
Surface ionization and complexation at the oxide/water interface II. Surface properties of amorphous iron oxyhydroxide and adsorption of metal ions
James A. Davis,James O. Leckie +1 more
TL;DR: In this paper, the site-binding model for the electrical double layer of hydrous oxides reported in a previous paper is applied to the adsorption of metal ions from dilute solution and to complex heterogeneous systems, i.e., amorphous iron oxyhydroxide.