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
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300 Area Uranium Leach and Adsorption Project
R. Jeffrey Serne,Christopher F. Brown,Herbert T. Schaef,Eric M. Pierce,Michael J. Lindberg,Zheming Wang,Paul L. Gassman,Jeffrey G. Catalano +7 more
TL;DR: In this article, the authors measured the leaching and adsorption characteristics of uranium in six near-surface sediment samples collected from the 300 Area of the Hanford Site and found that the uranium contamination in the sediments is most likely present as co-precipitates and discrete uranium particles.
Journal ArticleDOI
Real — Time Speciation of Uranium during Active Bioremediation and U(IV) Reoxidation
TL;DR: In this article, X-ray absorption near edge structure (XANES) spectroscopy was used to monitor uranium speciation in situ in a flowing column while active reduction was occurring and in situ post-biostimulation uranium stability and speciation when exposed to incoming oxic water.
Journal ArticleDOI
Transport of U(VI) through sediments amended with phosphate to induce in situ uranium immobilization.
TL;DR: LIFS analysis along with sequential extraction results suggest adsorption as the dominant uranium uptake mechanism, and the response of dissolved uranium concentrations to stopped-flow events and the comparison of experimental data with simulations from a simple reactive transport model indicated that uranium Adsorption to and desorption from the sediments was not always at local equilibrium.
Journal ArticleDOI
U(VI) adsorption on natural iron-coated sands: comparison of approaches for modeling adsorption on heterogeneous environmental materials
TL;DR: In this paper, the authors used a two-site, diffuse double layer, surface complexation model based on data for synthetic ferrihydrite to predict adsorption data for the same sand under different experimental conditions.
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Uranium Isotopic Fractionation Induced by U(VI) Adsorption onto Common Aquifer Minerals.
TL;DR: Adsorption to quartz, goethite, birnessite, illite, and aquifer sediments induced an average isotopic fractionation of -0.15‰ with the adsorbed U( VI) isotopically lighter than coexisting aqueous U(VI).
References
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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.