PittsburghV1, Main, Exploration, bibRecord, 004D47

Uranium Incorporation into Amorphous Silica

Identifieur interne : 004D47 ( Main/Exploration ); précédent : 004D46; suivant : 004D48

Uranium Incorporation into Amorphous Silica

Auteurs : Michael S. Massey [États-Unis] ; Juan S. Lezama-Pacheco [États-Unis] ; Joey M. Nelson [États-Unis] ; Scott Fendorf [États-Unis] ; Kate Maher [États-Unis]

Source :

Environmental science & technology [ 0013-936X ] ; 2014.

RBID : Pascal:15-0036699

Descripteurs français

Pascal (Inist)
- Uranium, Pollution radioactive, Décontamination, Immobilisation, Autoépuration, Silicate, Etat amorphe, Stabilité, Devenir polluant, Long terme, Pollution eau, Gestion risque, Radioisotope, Carcinogène, Toxique, Opale, Tectosilicate.
Wicri :
- topic : Uranium, Pollution radioactive.

English descriptors

KwdEn :
- Amorphous state, Carcinogen, Decontamination, Immobilization, Long term, Poison, Pollutant behavior, Radioactive pollution, Radioisotope, Risk management, Selfpurification, Silicates, Stability, Uranium, Water pollution.

Abstract

High concentrations of uranium are commonly observed in naturally occurring amorphous silica (including opal) deposits, suggesting that incorporation of U into amorphous silica may represent a natural attenuation mechanism and promising strategy for U remediation. However, the stability of uranium in opaline silicates, determined in part by the binding mechanism for U, is an important factor in its long-term fate. U may bind directly to the opaline silicate matrix, or to materials such as iron (hydr)oxides that are subsequently occluded within the opal. Here, we examine the coordination environment of U within opaline silica to elucidate incorporation mechanisms. Precipitates (with and without ferrihydrite inclusions) were synthesized from U-bearing sodium metasilicate solutions, buffered at pH ˜5.6. Natural and synthetic solids were analyzed with X-ray absorption spectroscopy and a suite of other techniques. In synthetic amorphous silica, U was coordinated by silicate in a double comer-sharing coordination geometry (Si at ˜3.8-3.9 A) and a small amount of uranyl and silicate in a bidentate, mononuclear (edge-sharing) coordination (Si at ˜3.1-3.2 A, U at ˜3.8-3.9 Å). In iron-bearing synthetic solids, U was adsorbed to iron (hydr)oxide, but the coordination environment also contained silicate in both edge-sharing and corner-sharing coordination. Uranium local coordination in synthetic solids is similar to that of natural U-bearing opals that retain U for millions of years. The stability and extent of U incorporation into opaline and amorphous silica represents a long-term repository for U that may provide an alternative strategy for remediation of U contamination.

Affiliations:

États-Unis

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Le document en format XML

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<term>Long term</term>
<term>Poison</term>
<term>Pollutant behavior</term>
<term>Radioactive pollution</term>
<term>Radioisotope</term>
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<term>Devenir polluant</term>
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<term>Pollution eau</term>
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<term>Radioisotope</term>
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<front><div type="abstract" xml:lang="en">High concentrations of uranium are commonly observed in naturally occurring amorphous silica (including opal) deposits, suggesting that incorporation of U into amorphous silica may represent a natural attenuation mechanism and promising strategy for U remediation. However, the stability of uranium in opaline silicates, determined in part by the binding mechanism for U, is an important factor in its long-term fate. U may bind directly to the opaline silicate matrix, or to materials such as iron (hydr)oxides that are subsequently occluded within the opal. Here, we examine the coordination environment of U within opaline silica to elucidate incorporation mechanisms. Precipitates (with and without ferrihydrite inclusions) were synthesized from U-bearing sodium metasilicate solutions, buffered at pH ˜5.6. Natural and synthetic solids were analyzed with X-ray absorption spectroscopy and a suite of other techniques. In synthetic amorphous silica, U was coordinated by silicate in a double comer-sharing coordination geometry (Si at ˜3.8-3.9 A) and a small amount of uranyl and silicate in a bidentate, mononuclear (edge-sharing) coordination (Si at ˜3.1-3.2 A, U at ˜3.8-3.9 Å). In iron-bearing synthetic solids, U was adsorbed to iron (hydr)oxide, but the coordination environment also contained silicate in both edge-sharing and corner-sharing coordination. Uranium local coordination in synthetic solids is similar to that of natural U-bearing opals that retain U for millions of years. The stability and extent of U incorporation into opaline and amorphous silica represents a long-term repository for U that may provide an alternative strategy for remediation of U contamination.</div>
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Uranium Incorporation into Amorphous Silica

Uranium Incorporation into Amorphous Silica

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Descripteurs français

English descriptors

Abstract

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