Sorption of Radioiodine in Organo-Clays and -Soils

Bors, J.

doi:10.1524/ract.1990.51.3.139

Cited by 47 publications

(21 citation statements)

References 15 publications

(20 reference statements)

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“…Several attempts have been made to improve the capacity and selectivity of the silicate minerals by treating them with organic compounds (Bors 1990(Bors , 1992Bors et al 1998Bors et al , 1994bBors et al , 1996Sazarashi et al 1995). Treated silicate minerals, such as montmorillonite and vermiculite, yielded K d values as high as 5000 mL/g.…”

Section: Silicate Mineralsmentioning

confidence: 99%

“…Treated silicate minerals, such as montmorillonite and vermiculite, yielded K d values as high as 5000 mL/g. An improved adsorption performance of these organic-modified minerals has been demonstrated in synthetic groundwater and seawater matrices in which the competing anion (such as chloride) was present in concentrations up to nine orders of magnitude higher than radioiodine in solution (Bors 1992;Bors et al 1998). However, the desorption characteristics of these organic-modified silicates are unknown.…”

Section: Silicate Mineralsmentioning

confidence: 99%

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Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

Pierce¹,

Mattigod²,

Westsik³

et al. 2010

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Executive SummaryPacific Northwest National Laboratory has initiated a waste-form testing program to support the longterm durability evaluation of a waste form for secondary wastes generated from the treatment and immobilization of Hanford radioactive tank wastes. The purpose of the work discussed in this report is to identify candidate stabilization technologies and getters that have the potential to successfully treat the secondary waste stream liquid effluent, mainly from off-gas scrubbers and spent solids, produced by the Hanford Tank Waste Treatment and Immobilization Plant (WTP). Down-selection to the most promising stabilization processes/waste forms is needed to support the design of a solidification treatment unit (STU) to be added to the Effluent Treatment Facility (ETF). To support key decision processes, an initial screening of the secondary liquid waste forms must be completed by February 2010. Later, more comprehensive and longer term performance testing will be conducted, following the guidance provided by the secondary waste-form selection, development, and performance evaluation roadmap. The resulting waste form will be compliant to regulations and performance criteria and will lead to cost-effective disposal of the secondary wastes.This report starts with a brief review of some of the most commonly used solidification formulations that would be candidates for secondary liquid waste streams. In this review, the available data on performance are discussed, and some preliminary recommendations are provided for materials that should undergo additional screening testing. We also 1) discuss options for disposal of WTP secondary solid waste streams, 2) provide a brief overview of standard regulatory test methods used for measuring contaminant leachability and waste-form physical strength (with emphasis on the U.S. Environmental Protection Agency's [EPA's] new methods as a screening tool for comparing waste solidification materials of interest), and 3) provide an overview of factors that must be considered in long-term performance testing, including state-of-the-art characterization tools that can provide the data needed to technically defend predictive modeling simulations of long-term material behavior. The long-term wasteform testing and solid and leachate characterization must be robust enough to effectively predict material performance in the Integrated Disposal Facility over the 10,000-year period of performance for the engineered system. The solidification technologies for liquid waste streams include cement/grout, containerized Cast Stone, phosphate-bonded ceramics, alkali-aluminosilicate geopolymers, hydroceramics, L-TEM, and fluidized-bed steam reforming (FBSR). In addition to these, other mature technologies and two compounds, namely goethite and sodalite (that are still being developed), that show considerable promise as waste forms or getters are also discussed. It is our recommendation, based upon the available literature, that Cast Stone, chemically bonded phosphate ceramics (Ceramicrete...

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Section: Silicate Mineralsmentioning

confidence: 99%

Section: Silicate Mineralsmentioning

confidence: 99%

Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

Pierce¹,

Mattigod²,

Westsik³

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Radioactive nuclides may be removed by clay adsorbents, for instance cesium ions by vermiculites and shales [42]. Even radioactive iodide ions can be adsorbed by modified clay minerals [43].…”

Section: Intracrystalline Reactionsmentioning

confidence: 99%

Silicates

Lagaly¹,

Tufar²,

Minihan³

et al. 2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Structural Chemistry of Silicates 1.1. Structural Classification 1.2. Oligo‐ and Cyclosilicates 1.3. Polysilicates 1.4. Phyllosilicates 1.4.1. Monophyllosilicates 1.4.2. Diphyllosilicates 1.4.3. Alkali Silicates 1.4.4. Crystalline Silicic Acids 1.4.5. Clay Minerals 1.4.6. Intracrystalline Reactions 1.5. Tectosilicates 2. Natural Silicates 2.1. Feldspar 2.1.1. Structure and Composition 2.1.2. Characterization of Individual Feldspars 2.1.3. Production 2.1.4. Properties 2.1.5. Mineral Deposits and their Extraction 2.1.6. Processing and Quality Requirements 2.1.7. Uses and Economic Aspects 2.2. Nepheline and Related Compounds 2.3. Leucite 2.4. Olivine 2.5. Andalusite 2.6. Kyanite 2.7. Sillimanite 2.8. Mullite 2.9. Vermiculite 2.10. Perlite 2.11. Pumice 2.12. Basalt 2.13. Wollastonite 2.14. Toxicology 3. Alkali Silicates 3.1. Introduction 3.2. Raw Materials 3.3. Amorphous Anhydrous Alkali Silicates (Solid or Lump Glasses) 3.4. Silicate Solutions 3.5. Hydrated Water‐Soluble Silicates 3.6. Crystalline Solids 3.7. Uses and Applications 3.8. Economic Aspects 3.9. Storage, Safety, Labelling and Transportation 3.10. Analysis

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“…clays and carbonates) in the repository near-field [9][10][11]. The interaction between iodine species and silicate minerals is weak [12,13], and sorption of iodine in soils is basically due to the presence of organic matter and (to a lesser extent) iron and aluminium oxides [14][15][16][17]. Finding or synthesizing materials that can prevent the migration of 129 I radionuclide is therefore desirable [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study on iodine uptake by selected LDH phases via coprecipitation, anionic exchange and reconstruction

Pérez

Walther

Medina

et al. 2015

J Radioanal Nucl Chem

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We explored the use of selected layered double hydroxides (LDHs) of different compositions and obtained by means of different routes (i.e., coprecipitation, anionic exchange and reconstruction) as iodine/iodate adsorbents. The influence of speciation (iodide vs. iodate) on iodine uptake was rather strong, resulting in much lower iodide incorporation. The Fourier transform of iodine K X-ray absorption edge data (EXAFS) of all iodate-LDHs showed a single I-O scattering path of 1.8 Å . Thermal stability and leaching experiments showed that the incorporated iodate and iodide were rather loosely bound in the interlayer space and were easily released under heating to 180°C and leaching with Milli-Q water and brine solution.

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Sorption of Radioiodine in Organo-Clays and -Soils

Cited by 47 publications

References 15 publications

Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

Review of Potential Candidate Stabilization Technologies for Liquid and Solid Secondary Waste Streams

Silicates

A comprehensive study on iodine uptake by selected LDH phases via coprecipitation, anionic exchange and reconstruction

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