Sorption of Am(III) onto 6-Line-Ferrihydrite and Its Alteration Products: Investigations by EXAFS
نویسندگان
چکیده
منابع مشابه
Lead sorption onto ferrihydrite. 3. Multistage contacting.
Few studies have demonstrated the practical application of surface complexation models, calibrated with fundamental macroscopic and spectroscopic metal sorption data, in helping to solve industrial trace metal emissions problems. In this work, multistage ferrihydrite sorption systems are evaluated for their effectiveness in reducing single-solute lead(II) [Pb(II)] concentrations in contaminated...
متن کاملMechanistic and thermodynamic interpretations of zinc sorption onto ferrihydrite.
Elucidating the reaction mechanisms and estimating the associated transport and thermodynamic parameters are important for an accurate description of the fate of toxic metal pollutants, such as Zn(II), in soils and aquatic ecosystems rich in iron oxides. Consequently, sorption of Zn(II) ions onto ferrihydrite was investigated with macroscopic and spectroscopic studies as a function of pH (4.0-8...
متن کاملLead sorption onto ferrihydrite. 1. A macroscopic and spectroscopic assessment.
In this research, traditional macroscopic studies were complemented with XAS analyses to elucidate the mechanisms controlling Pb(II) sorption onto ferrihydrite as a function of pH, ionic strength, and adsorbate concentrations. Analyses of XANES and XAFS studies demonstrate that Pb(II) ions predominantly sorb onto ferrihydrite via inner-sphere complexation, not retaining their primary hydration ...
متن کاملSurface complexation modeling of zinc sorption onto ferrihydrite.
A previous study involving lead(II) [Pb(II)] sorption onto ferrihydrite over a wide range of conditions highlighted the advantages of combining molecular- and macroscopic-scale investigations with surface complexation modeling to predict Pb(II) speciation and partitioning in aqueous systems. In this work, an extensive collection of new macroscopic and spectroscopic data was used to assess the a...
متن کاملTransformation of 2-line ferrihydrite to 6-line ferrihydrite under oxic and anoxic conditions
Mineralogical transformations of 2-line ferrihydrite were studied under oxic and Fe-reducing conditions to establish the role, if any, of 6-line ferrihydrite (“well” organized ferrihydrite) in the reaction pathway and as a final product. In oxic experiments, concentrated suspensions (0.42 mol/L Fe in 0.1 mol/L NaClO4) of freshly synthesized 2-line ferrihydrite, with and without 3% Ni, were aged...
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ژورنال
عنوان ژورنال: Environmental Science & Technology
سال: 2006
ISSN: 0013-936X,1520-5851
DOI: 10.1021/es052518e