The function of Sn(II)-apatite as a Tc immobilizing agent

Asmussen, R. Matthew; Neeway, James J.; Lawter, Amanda R.; Levitskaia, Tatiana G.; Lukens, Wayne W.; Qafoku, Nikolla P.

doi:10.1016/j.jnucmat.2016.09.002

The function of Sn(II)-apatite as a Tc immobilizing agent

Journal Article · Sat Sep 03 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.09.002· OSTI ID:1480744

^[1]; Neeway, James J. ^[1]; ^[1]; Levitskaia, Tatiana G. ^[1]; Lukens, Wayne W. ^[2]; Qafoku, Nikolla P. ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division

At the U.S. Department of Energy Hanford Site, Tc-99 is a component of low-activity waste (LAW) fractions of the nuclear tank waste and removal of Tc from LAW streams would greatly benefit the site remediation process. We investigated the removal of Tc(VII), as pertechnetate, from deionized water (DIW) and a LAW simulant through batch sorption testing and solid phase characterization using tin (II) apatite (Sn-A) and SnCl₂. Sn-A showed higher levels of Tc removal from both DIW and LAW simulant. Scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/XEDS) and X-ray absorption spectroscopy (XAS) of reacted Sn-A in DIW showed that TcO4- is reduced to Tc(IV) on the Sn-A surface. Finally, the performance of Sn-A in the LAW simulant was lowered due to a combined effect of the high alkalinity, which lead to an increased dissolution of Sn from the Sn-A, and a preference for the reduction of Cr(VI).

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Environmental Management (EM)

Grant/Contract Number:: AC02-05CH11231; AC06-76RL01830; AC02-76SF00515

OSTI ID:: 1480744

Alternate ID(s):: OSTI ID: 1343176
OSTI ID: 22648407
OSTI ID: 1396801

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 480; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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