Uranium sorption

Payne, T.E. Waite, T.D. (1991) Surface com-plexation modeling of uranium sorption data obtained by isotopic exchange techniques. Radiochim. Acta 52-53 (Pt 2) 487-493 Peacock, M.A. (1942) On goethite and lepidocro-cite. Trans. Roy. Soc. Ca. 36 107-119 Peacock, S. Rimmer, D.L. (2000) The suitability of an iron oxide-rich gypsum by-product as a soil amendment. J. Environ. Qual. 29 1969-1975... 

High amounts of Ca (and potentially Ra), Sr, and LREE were co-precipitated by Al-phosphates from the crandallite group, which crystallized in the clay halo. Clay minerals (mainly chlorite and to a lower extent illite) and Ti-oxide were found to have sorbed significant amounts of uranium. Sorption onto mineral surfaces was followed by the formation of coffinite, USi04-nH20, rimming clay, and rutile particles. 

Payne, T. E. Waite, T. D. 1991. Surface complexation modeling of uranium sorption data obtained by isotope exchange techniques. Radiochimica Acta, 52/53, 487-493. 

The sorption and desorption behavior of uranium is similar to neptunium. Figure 3 shows that hysteresis is more important for uranium sorption under reducing conditions than under oxidizing conditions. Values of Ng/Nd are 10 and approximately 200 for oxidizing and reducing conditions, respectively. 

Figure 3. Sorption and Desorption Isotherms for Uranium Sorption on Mabton Interbed Solids, (a) Oxidizing Conditions, (b) Reducing Conditions.

Sheppard MI, Vandergraaf TT, Thibault DH, et al. 1983. Technetium and uranium Sorption by and plant uptake from peat and sand. Health Phys 44 635-644. 

Ticknor KV. 1994. Uranium sorption on geological materials. Radiochimica Acta 64 229-236. 

Numerous publications in the 1960s and 1970s dealt in detail with the description of the mechanism, equilibrium, and kinetics of the uranium sorption reaction on titanium hydroxide [163]. Scaled-up testing of uranium sorption from seawater was carried out in the Soviet Union, United States of America, Great Britain, and Germany. The results were used in the design and construction of units for uranium recovery approximately 10-100 g of uranium were produced per year [180,181]. 

Uranium sorption by the sorbent (usually in a fluidized bed) with large amounts of seawater... 

A large number of studies of uranium sorption have been carried out in support of the nuclear waste disposal programs and the uranium mill tailings program (UMTRA). Park et al. (1992) and Prasad et al. (1997) describe studies of sorption of uranyl ion by corrensite, the clay mineral lining many fractures in the fractured Culebra Dolomite member of the Rustler Formation above the WIPP in SE New Mexico. The studies were carried out in dilute and concentrated NaCl (0.1-3 M) solutions in the presence of Ca, carbon-... 

Prikryl J. D., Jain A., Turner D. R., and Pabalan R. T. (2001) Uranium sorption behavior on silicate mineral mixtures. 

Some uranium ore bodies are high in limestone and dolomitic content which is wasteful on acid employed for leaching. Such sources are successfully treated by an alkaline mixed sodium carbonate and bicarbonate leach, the later being required to buffer the pH so as not to precipitate the uranium. Sorption occurs as the uranyl carbonate complex anion, U02(C03)3 , but elution is with sodium nitrate since acid would cause evolution of carbon dioxide gas. 

Hayes, K.E et al.. Application of surface complexation models for radionuclide adsorption Sensitivity analysis of model input parameters, NUREG/CR-5547, US Nuclear Regulatory Commission, Washington DC, 1990, cited after Prikryl, J.D. et al.. Uranium sorption on a alumina Effects of pH and surface area/solution volume ratio, Radiochim. Acta, 66/67, 291, 1994. 

Fuller CC, Bargar, JR, Davis JA, Piana MJ (2002a) Mechanisms of uranium interactions with hydroxyapatite Implications for groundwater remediation. Environ Sci Technol 36 158-165 Fuller CC, Bargar JR, Piana MJ, and Davis JA (2002b) Molecular-scale characterization of uranium sorption by apatite materials from a permeable reactive barrier demonstration. Environ Sci Technol (submitted)... 

The kinetics of the DEHPA-TOPO resins tested are slow compared to other conventional anion exchange resins used for uranium sorption, but about 5 to 10 times faster than with an ion-exchange resin containing aminophosphonic groups (DES 467, Dia-Prosin). The rate of uranium adsorption from 6 M phosphoric acid solutions was studied extensively with... 

Figture 23 Effect of phophoric acid concentration on uranium sorption for DEHPA-TOPO-containing mixtures. (From Ref. 4.)... 

Figure 5.2 Comparison of experimentally determined uranium sorption onto hydrous ferric oxide colloids from the gallery Rothschonberger Stolln with various speciation models.

Camtakan Z, Erenturk S, Yusan S (2012) Magnesium oxide nanoparticles Preparation, characterization, and uranium sorption properties. Environ Progr Sustain Energy 31 536-543... 

Many other natural materials, including several metal hydroxides (Fe, Al, Mn) as well as clays, are capable of adsorbing uranium. Sorption proceeds to a variable extent. It usually depends on the pH of the solution and the pH range for the greatest sorption of uranyl overlaps the pH range of minimal solubility of uranyl minerals. 

Payne, T.E., R. Edis, B.R. Fenton, and T.D. Waite. 2001. Comparison of laboratory uranium sorption data with in situ distribution coefficients at the Koongarra uranium deposit. Northern Australia. J. Environ. Radioactivity 57 35-55. 

After precipitation, adsorption is the most important sink for U in natural systems. Uranium sorption in soils is primarily controlled by pH and carbonate levels (see Davis et al., 2002, this publication). At high pHs, where anionic uranyl-car-bonate complexes predominate, U is only weakly sorbed due to electrostatic repulsion by negatively charged mineral surfaces. When carbonate concentrations are low or absent uranyl-hydroxy surface complexes are observed to form. Minor irreversible sorption of U typically occurs when Fe and Mn oxides are present. Colloidal transport appears to be a less important transport mechanism for U relative to other actinides (see review of Jove Colon et al., 2001). 

Pabalan, R.T., D.R. Turner, F.P. Bertetti, and J.D. Prikiyl. 1998. Uranium sorption onto selected mineral surfaces, p. 199-130. In E.A. Jenne (ed.) Adsorption of metals by geomedia. Academic Press, New York. 

Dragan, E.S., Avram, E., Axente, D., Marcu, C. (2004) Ion-exchange resins El. Functionalization-morphology correlations in the S3mthesis of some macroporous, strong basic anion exchangers and uranium-sorption properties evaluation. Journal of Polymer Science Part A Polymer Chemistry, 42, 2451-2461. 

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