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Li, D., S. Murph, D.I. Kaplan, K. Taylor-Pashow, M. Denham, and J. Seaman.
Savannah River National Laboratory, 2017 LDRD: Laboratory Directed Research and Development Program, SRNL-STI-2018-00143:41-47(2018)

Remediation of technetium (Tc) remains an unresolved challenge at the Savannah River Site and other DOE facilities. The objective of this project was to develop novel bimetallic porous iron (pFe) materials for Tc removal from aqueous systems. Bimetallic porous iron (pFe) was much more effective in removing TcO4- (x30) and ReO4- (x8) from artificial groundwater than granular iron. Tc K-edge XANES spectroscopy indicated that Tc speciation on the pFe was 18% adsorbed TcO4-, 28% Tc(IV) in Tc dioxide, and 54% Tc(IV) into the structure of Fe hydroxide. A variety of catalytic metal nanoparticles (i.e., Ni, Cu, Zn, Ag, Sn and Pd) were successfully deposited on the pFe using scalable chemical reduction methods. The Zn-pFe was outstanding among the six bimetallic pFe materials, with a capacity increase of >100% for TcO4- removal and of 50% for ReO4- removal, compared to the pFe. See pages 41-47 at https://srnl.doe.gov/LDRD/pdf/FY17_SRNL_LDRD_Report.pdf.

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