skip to main content

DOE PAGESDOE PAGES

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

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 SnCl 2. 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).
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ;  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC06-76RL01830; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 480; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Environmental Management (EM)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; technetium; nuclear waste; X-ray absorption spectroscopy; waste forms; Hanford
OSTI Identifier:
1480744
Alternate Identifier(s):
OSTI ID: 1396801

Asmussen, R. Matthew, Neeway, James J., Lawter, Amanda R., Levitskaia, Tatiana G., Lukens, Wayne W., and Qafoku, Nikolla P.. The function of Sn(II)-apatite as a Tc immobilizing agent. United States: N. p., Web. doi:10.1016/j.jnucmat.2016.09.002.
Asmussen, R. Matthew, Neeway, James J., Lawter, Amanda R., Levitskaia, Tatiana G., Lukens, Wayne W., & Qafoku, Nikolla P.. The function of Sn(II)-apatite as a Tc immobilizing agent. United States. doi:10.1016/j.jnucmat.2016.09.002.
Asmussen, R. Matthew, Neeway, James J., Lawter, Amanda R., Levitskaia, Tatiana G., Lukens, Wayne W., and Qafoku, Nikolla P.. 2016. "The function of Sn(II)-apatite as a Tc immobilizing agent". United States. doi:10.1016/j.jnucmat.2016.09.002. https://www.osti.gov/servlets/purl/1480744.
@article{osti_1480744,
title = {The function of Sn(II)-apatite as a Tc immobilizing agent},
author = {Asmussen, R. Matthew and Neeway, James J. and Lawter, Amanda R. and Levitskaia, Tatiana G. and Lukens, Wayne W. and Qafoku, Nikolla P.},
abstractNote = {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).},
doi = {10.1016/j.jnucmat.2016.09.002},
journal = {Journal of Nuclear Materials},
number = ,
volume = 480,
place = {United States},
year = {2016},
month = {9}
}