Redox Behavior of Uranium at the Nanoporous Aluminum Oxide-Water Interface: Implications for Uranium Remediation

Sorption–desorption experiments show that the majority (ca. 80–90%) of U(VI) presorbed to mesoporous and nanoporous alumina could not be released by extended (2 week) extraction with 50 mM NaHCO3 in contrast with non-nanoporous α alumina. The extent of reduction of U(VI) presorbed to aluminum oxides...

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Veröffentlicht in:	Environmental science & technology 2012-07, Vol.46 (13), p.7301-7309
Hauptverfasser:	Jung, Hun Bok, Boyanov, Maxim I, Konishi, Hiromi, Sun, Yubing, Mishra, Bhoopesh, Kemner, Kenneth M, Roden, Eric E, Xu, Huifang
Format:	Artikel
Sprache:	eng
Schlagworte:	Adsorption Aluminum Aluminum Oxide - chemistry Applied sciences Biological and physicochemical properties of pollutants. Interaction in the soil Bioremediation Carbonates - chemistry Chemical compounds Decontamination. Miscellaneous Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Environmental Restoration and Remediation Environmental science ENVIRONMENTAL SCIENCES Exact sciences and technology Nanostructures - chemistry Nanostructures - ultrastructure Oxidation Oxidation-Reduction Pollution Pollution, environment geology Porosity Radioactive Pollutants - chemistry Radioactive Pollutants - isolation & purification Soil and sediments pollution Sorption Uranium Uranium - chemistry Uranium - isolation & purification uranium, sorption, redox reaction, nanopore, bioremediation, aluminum oxide, subsurface Water - chemistry X-Ray Absorption Spectroscopy
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Zusammenfassung:	Sorption–desorption experiments show that the majority (ca. 80–90%) of U(VI) presorbed to mesoporous and nanoporous alumina could not be released by extended (2 week) extraction with 50 mM NaHCO3 in contrast with non-nanoporous α alumina. The extent of reduction of U(VI) presorbed to aluminum oxides was semiquantitatively estimated by comparing the percentages of uranium desorbed by anoxic sodium bicarbonate between AH2DS-reacted and unreacted control samples. X-ray absorption spectroscopy confirmed that U(VI) presorbed to non-nanoporous alumina was rapidly and completely reduced to nanoparticulate uraninite by AH2DS, whereas reduction of U(VI) presorbed to nanoporous alumina was slow and incomplete (
ISSN:	0013-936X 1520-5851
DOI:	10.1021/es2044163