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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Bibliographic Details
Published in:Environmental science & technology 2012-07, Vol.46 (13), p.7301-7309
Main Authors: Jung, Hun Bok, Boyanov, Maxim I, Konishi, Hiromi, Sun, Yubing, Mishra, Bhoopesh, Kemner, Kenneth M, Roden, Eric E, Xu, Huifang
Format: Article
Language:English
Subjects:
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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Summary: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