Journal
INORGANIC CHEMISTRY
Volume 55, Issue 17, Pages 8241-8243Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.6b01004
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Funding
- U.S. Department of Energy (DOE) Waste Treatment and Immobilization Plant Project of the Office of River Protection
- DOE Office of Environmental Management (EM) International Program as part of the portfolio
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- DOE by Battelle Memorial Institute [DE-AC05-76RL01830]
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The efficient removal of pertechnetate (TcO4-) anions from liquid waste or melter off-gas solution for an alternative treatment is one of the promising options to manage Tc-99 in legacy nuclear waste. Safe immobilization of Tc-99 is of major importance because of its long half-life (t(1/2) = 2.13 X 10(5) yrs) and environmental mobility. Different types of inorganic and solid-state ion-exchange materials have been shown to absorb TcO4- anions from water. However, both high capacity and selectivity have yet to be achieved in a single material. Herein, we show that a protonated version of an ultrastable zirconium-based metal-organic framework can adsorb perrhenate (ReO4-) anions, a nonradioactive surrogate for TcO4-, from water even in the presence of other common anions. Synchrotron-based powder X-ray diffraction and molecular simulations were used to identify the position of the adsorbed ReO4- (surrogate for TcO4-) molecule within the framework.
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