Photoreduction of 99Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium
作者： Benjamin P. Burton-Pye , Ivana Radivojevic , Donna McGregor , Israel M. Mbomekalle , Wayne W. Lukens
DOI: 10.1021/JA2060929
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摘要: Technetium-99 (99Tc) (β–max: 293.7 keV; t1/2: 2.1 × 105 years) is a byproduct of uranium-235 fission and comprises large component radioactive waste. Under aerobic conditions in neutral–basic environment, the pertechnetate anion (99TcO4–) stable. 99TcO4– very soluble, migrates easily through environment does not sorb well onto mineral surfaces, soils, or sediments. This study moves forward new strategy for reduction chemical incorporation reduced 99Tc into metal oxide material. employs single material, polyoxometalate (POM), α2-[P2W17O61]10–, that can be photoactivated presence 2-propanol to transfer electrons incorporate covalently α2-framework form 99TcVO species, 99TcVO(α2-P2W17O61)7–. occurs via formation an intermediate species slowly converts Extended X-ray absorption fine structure near-edge spectroscop...
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