Role of nano-goethite in controlling U(VI) sorption-desorption in subsurface soil

Iron oxide nanoparticles in natural soils and sediments can be nanoporous due to the aggregation of nanoparticles. Nanopores can greatly affect the sorption-desorption as well as reduction-oxidation behavior of U(VI) because of their high internal surface area and nanopore confinement effects. Batch...

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Bibliographic Details
Published in:Journal of geochemical exploration 2016-10, Vol.169 (C), p.80-88
Main Authors: Jung, Hun Bok, Xu, Huifang, Konishi, Hiromi, Roden, Eric E.
Format: Article
Language:English
Subjects:
Goethite
Nanopores
Saprolite
Sorption
Uranium
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Summary:Iron oxide nanoparticles in natural soils and sediments can be nanoporous due to the aggregation of nanoparticles. Nanopores can greatly affect the sorption-desorption as well as reduction-oxidation behavior of U(VI) because of their high internal surface area and nanopore confinement effects. Batch U(VI) sorption-desorption experiments were conducted to understand the role of nano-goethite in controlling U(VI) sorption-desorption behavior in saprolite subsoil from Oak Ridge Field Research Center (ORFRC), Tennessee, a premier field research site for environmental remediation. The subsoil samples from ~6.5–8.5m depth were nearly homogeneous in mineral composition (quartz, illite and smectite) and particle size distribution. The subsoil samples were characterized by a range of dithionite-citrate-bicarbonate (DCB) extractable Fe(III) oxide content (127–404μM/g), BET surface area (25–38m2/g), and nanoporosity (pore size
ISSN:0375-6742
1879-1689
DOI:10.1016/j.gexplo.2016.07.014