期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 46, 期 13, 页码 7301-7309出版社
AMER CHEMICAL SOC
DOI: 10.1021/es2044163
关键词
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资金
- U.S. Department of Energy [DE-SC0002150]
- Argonne Subsurface Science Focus Area, which is part of the United States Department of Energy (U.S. DOE), Office of Science (OS), Office of Biological and Environmental Research
- U.S. DOE OS Office of Basic Energy Science (BES)
- MRCAT/EnviroCAT member institutions
- US DOE OS BES [DE-AC02-06CH11357]
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 alpha 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 AH(2)DS-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 AH(2)DS, whereas reduction of U(VI) presorbed to nanoporous alumina was slow and incomplete (<5% reduction after 1 week). The observed nanopore size-dependent redox behavior of U has important implications in developing efficient remediation techniques for the subsurface uranium contamination because the efficiency of in situ bioremediation depends on how effectively and rapidly U(VI) bound to sediment or soil can be converted to an immobile phase.
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