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Characterization of silver-kaolinite (AgK): an adsorbent for long-lived (129)I species.

Sadasivam S, Rao SM - Springerplus (2016)

Bottom Line: Bentonite is a preferred buffer and backfill material for deep geological disposal of high-level nuclear waste (HLW).Bentonite does not retain anions by virtue of its negatively charged basal surface.The AgK is prepared by heating kaolinite-silver nitrate mix at 400 °C to study the kaolinite influence on the transition metal ion when reacting at its dehydroxylation temperature.

View Article: PubMed Central - PubMed

Affiliation: Geoenvironmental Research Centre, Cardiff University, Cardiff, CF24 3AA UK.

ABSTRACT
Bentonite is a preferred buffer and backfill material for deep geological disposal of high-level nuclear waste (HLW). Bentonite does not retain anions by virtue of its negatively charged basal surface. Imparting anion retention ability to bentonite is important to enable the expansive clay to retain long-lived (129)I (iodine-129; half-life = 16 million years) species that may escape from the HLW geological repository. Silver-kaolinite (AgK) material is prepared as an additive to improve the iodide retention capacity of bentonite. The AgK is prepared by heating kaolinite-silver nitrate mix at 400 °C to study the kaolinite influence on the transition metal ion when reacting at its dehydroxylation temperature. Thermo gravimetric-Evolved Gas Detection analysis, X-ray diffraction analysis, X-ray photo electron spectroscopy and electron probe micro analysis indicated that silver occurs as AgO/Ag2O surface coating on thermally reacting kaolinite with silver nitrate at 400 °C.

No MeSH data available.


Wavelength dispersion elemental map of aluminium (Al), silicon (Si) and oxygen (O) obtained from kaolinite specimen
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Fig10: Wavelength dispersion elemental map of aluminium (Al), silicon (Si) and oxygen (O) obtained from kaolinite specimen

Mentions: The wavelength dispersion X-ray elemental maps of kaolinite and AgK specimens along with backscattered electron images are presented in Figs. 10, 11 and 12. Figure 10 illustrates the distribution of silicon, aluminium and oxygen atoms on the kaolinite surface. Figure 11 illustrates the elemental map image of Si, Al, O and Ag distribution in AgK specimen. Figure 12 presents the elemental map of silver obtained from AgK along with scanning electron microscope (SEM) image of AgK which shows the distribution of silver on the surface of the AgK specimen.Fig. 10


Characterization of silver-kaolinite (AgK): an adsorbent for long-lived (129)I species.

Sadasivam S, Rao SM - Springerplus (2016)

Wavelength dispersion elemental map of aluminium (Al), silicon (Si) and oxygen (O) obtained from kaolinite specimen
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4764597&req=5

Fig10: Wavelength dispersion elemental map of aluminium (Al), silicon (Si) and oxygen (O) obtained from kaolinite specimen
Mentions: The wavelength dispersion X-ray elemental maps of kaolinite and AgK specimens along with backscattered electron images are presented in Figs. 10, 11 and 12. Figure 10 illustrates the distribution of silicon, aluminium and oxygen atoms on the kaolinite surface. Figure 11 illustrates the elemental map image of Si, Al, O and Ag distribution in AgK specimen. Figure 12 presents the elemental map of silver obtained from AgK along with scanning electron microscope (SEM) image of AgK which shows the distribution of silver on the surface of the AgK specimen.Fig. 10

Bottom Line: Bentonite is a preferred buffer and backfill material for deep geological disposal of high-level nuclear waste (HLW).Bentonite does not retain anions by virtue of its negatively charged basal surface.The AgK is prepared by heating kaolinite-silver nitrate mix at 400 °C to study the kaolinite influence on the transition metal ion when reacting at its dehydroxylation temperature.

View Article: PubMed Central - PubMed

Affiliation: Geoenvironmental Research Centre, Cardiff University, Cardiff, CF24 3AA UK.

ABSTRACT
Bentonite is a preferred buffer and backfill material for deep geological disposal of high-level nuclear waste (HLW). Bentonite does not retain anions by virtue of its negatively charged basal surface. Imparting anion retention ability to bentonite is important to enable the expansive clay to retain long-lived (129)I (iodine-129; half-life = 16 million years) species that may escape from the HLW geological repository. Silver-kaolinite (AgK) material is prepared as an additive to improve the iodide retention capacity of bentonite. The AgK is prepared by heating kaolinite-silver nitrate mix at 400 °C to study the kaolinite influence on the transition metal ion when reacting at its dehydroxylation temperature. Thermo gravimetric-Evolved Gas Detection analysis, X-ray diffraction analysis, X-ray photo electron spectroscopy and electron probe micro analysis indicated that silver occurs as AgO/Ag2O surface coating on thermally reacting kaolinite with silver nitrate at 400 °C.

No MeSH data available.