U(VI) sorption during ferrihydrite formation: Underpinning radioactive effluent treatment
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 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 کاملKinetic controls on Cu and Pb sorption by ferrihydrite.
Metal partitioning in ferrihydrite suspensions may reach equilibrium only after a long reaction time. To determine key factors controlling the kinetics, we measured Cu and Pb uptake as a function of ferrihydrite morphology, reaction temperature, metal competition, and fulvic acid concentration over a period of 2 months. X-ray microscopy, which was used to probe ferrihydrite morphology in suspen...
متن کاملPhosphate effects on cadmium(II) sorption to ferrihydrite.
HYPOTHESIS Phosphate influences the sorption of metals to iron (hydr)oxides. An enhanced formation of inner-sphere complexes on the (hydr)oxide surface can be attributed to electrostatic interactions and/or to changes in metal coordination on the iron (hydr)oxide surface. Phosphate was expected to increase cadmium(II) sorption on ferrihydrite. It should be possible to identify changes in cadmiu...
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...
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ژورنال
عنوان ژورنال: Journal of Hazardous Materials
سال: 2019
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2018.11.077