Abstract
:The surface engineering of polycarbonate track-etched (PCTE) membranes was performed to create a permselective membrane for the removal of trace levels of fission products and transuranic metals from acidic streams. Electroless gold deposition was used to place a gold coating on the PCTE substrates. The gold coating was subsequently functionalized through the formation of a self-assembled monolayer of dodecanethiol, which was further functionalized with di-(4-t-butylphenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide. Transport characteristics of metal ions, 137Cs, 85Sr, 241Am, and 239Pu, were obtained using a two-compartment diffusion apparatus. Transport studies showed that the functionalized membranes enhance the transport rates of 241 Am and 239Pu and inhibit the transport of 137Cs and 85Sr. Diffusion studies over an extended time revealed that the facilitated transport characteristics of 239Pu through the ligand-coated membranes are dependent on nitrate anion concentrations in the feed and sink cells.
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