In Situ Formation of Apatite in Soil and Groundwater for Containment of Radionuclides and Heavy Metals

Moore, R. L.; Zhao, Hongting; Sanchez, C. A.; Holt, Kathleen Caroline; Salas, Fred Manuel; Hasan, Ahmed Ali Mohamed; Lucero, Daniel A.

doi:10.2172/805864

Cited by 8 publications

(12 citation statements)

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“…Methods to remove selenium from water and groundwater include phytoremediation (Esringü and Turan, 2012), biological treatment (Hageman et al, 2013), ion exchange, evaporation, chemical treatment and filtration (Bond, 2000) and permeable reactive barriers (PRB) (Zhang et al, 2008). All of these methods with the exception of using PRB are active treatment technologies that have significant capital costs, create waste streams, can expose workers to the contaminant and have significant long-term operational costs (Moore, 2003;Moore et al, 2004;Naftz et al, 2002). Typically, the reactive media used in PRBs are ion exchange media including activated carbon and natural minerals.…”

Section: -mentioning

confidence: 99%

Selenite sorption by carbonate substituted apatite

Moore

Rigali

Brady

2016

Environmental Pollution

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The sorption of selenite, SeO, by carbonate substituted hydroxylapatite was investigated using batch kinetic and equilibrium experiments. The carbonate substituted hydroxylapatite was prepared by a precipitation method and characterized by SEM, XRD, FT-IR, TGA, BET and solubility measurements. The material is poorly crystalline, contains approximately 9.4% carbonate by weight and has a surface area of 210.2 m/g. Uptake of selenite by the carbonated hydroxylapatite was approximately an order of magnitude higher than the uptake by uncarbonated hydroxylapatite reported in the literature. Distribution coefficients, K, determined for the carbonated apatite in this work ranged from approximately 4200 to over 14,000 L/kg. A comparison of the results from kinetic experiments performed in this work and literature kinetic data indicates the carbonated apatite synthesized in this study sorbed selenite 23 times faster than uncarbonated hydroxylapatite based on values normalized to the surface area of each material. The results indicate carbonated apatite is a potential candidate for use as a sorbent for pump-and-treat technologies, soil amendments or for use in permeable reactive barriers for the remediation of selenium contaminated sediments and groundwaters.

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Section: -mentioning

confidence: 99%

Selenite sorption by carbonate substituted apatite

Moore

Rigali

Brady

2016

Environmental Pollution

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“…Hydroxyapatite has the ability to sequester Np, Pu, and U at ambient conditions with reported & values up to lo6 Vmole [2]. Significant Tc sorption was also observed for bone-derived apatite when SnClz was used as a reducing agent.…”

Section: Hydroxyapatite "Getters"mentioning

confidence: 99%

Yucca Mountain Project - Science & Technology Radionuclide Absorbers Development Program Overview

Jow¹,

Moore²,

Helean³

et al. 2005

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The proposed Yucca Mountain repository is anticipated to be the first facility for long-term disposal of commercial spent nuclear fuel and high-level radioactive waste in the United States. The facility, located in the southern Nevada desert, is currently in the planning stages with initial exploratory excavations completed. It is an underground facility mined into the tuffaceous volcanic rocks that sit above the local water table. The focus of the work described in this paper is the development of radionuclide absorbers or "getter" materials for neptunium (Np), iodine (I), and technetium (Tc) for potential deployment in the repository. "Getter" materials retard the migration of radionuclides through sorption, reduction, or other chemical and physical processes, thereby slowing or preventing the release and transport of radionuclides. An overview of the objectives and approaches utilized in this work with respect to materials selection and modeling of ion "getters" is presented. The benefits of the "getter" development program to the United States Department of Energy (US DOE) are outlined.

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“…Hydroxyapatite has been the focus of many laboratory studies and is utilized for environmental remediation of contaminated sites (Moore et al, 2002). Recent work at Sandia National Laboratory demonstrated that hydroxyapatite has a strong affinity for U, Pu, Np, Sr and Tc reduced from pertechnetate (TcO 4 -) by SnCl 2 (Moore et al, 2002). Metal cations (e.g.…”

Section: Sequestration Of Radionuclides and Heavy Metals By Hydroxyapmentioning

confidence: 99%

Goldschmidt Conference Abstracts 2005

2005

Geochimica et Cosmochimica Acta

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4 MS 954, U.S. Geological Survey, Reston, VA (imchou@usgs.gov)Fluid-solid and fluid-melt interactions up to 850 °C and 500 MPa in a hydrothermal diamond anvil cell were monitored using X-ray microspectroscopy. The high spatial resolution of the X-ray microprobe permits separate in situ analyses of different phases at a given temperature and pressure. Spectra were collected continuously for periods of up to 12 hours on beam lines 13ID-C or 201D-B at the Advanced Photon Source, Argonne National Laboratory, Chicago. The local structure or partial composition of the aqueous fluid or melt is determined using X-ray absorption fine structure (XAFS) and X-ray fluorescence (XRF) spectra, respectively. Quantitative elemental analysis of the aqueous fluid is achieved by using an internal spike. Analytical sensitivity is enhanced by reducing the path length of the Xrays in diamond to 80 micrometers by laser-milling a sample chamber and grooves in the culet face of one of the diamond anvils. The potential of this technique will be demonstrated using examples involving zircon-fluid and melt-fluid interaction.

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In Situ Formation of Apatite in Soil and Groundwater for Containment of Radionuclides and Heavy Metals

Cited by 8 publications

References 0 publications

Selenite sorption by carbonate substituted apatite

Selenite sorption by carbonate substituted apatite

Yucca Mountain Project - Science & Technology Radionuclide Absorbers Development Program Overview

Goldschmidt Conference Abstracts 2005

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