Separation of actinides(III) from lanthanides(III) by extraction chromatography using new ,'-dialkyl-,'-diphenylpyridine-2,6-dicarboxyamides

Arisaka, Makoto ; Watanabe, Masayuki   ; Kimura, Takaumi 

Four ,'-dialkyl-,'-diphenylpyridine-2,6-dicarboxyamides (R-PDA; R = butyl, octyl, decyl, dodecyl) were newly synthesized and were applied to extraction chromatography as extractant to attain the separation of actinides(III) from high level radioactive waste containing lanthanides(III). R-PDA was successfully impregnated into XAD-4 resin. It was found that (i) the leakage of R-PDA from XAD-4 resin was suppressed with an increase of the length of the alkyl groups in R-PDA, while the leakage for each adsorbent resin was promoted with an increase of HNO concentration in the aqueous phase and (ii) Oc-PDA or De-PDA/XAD-4 resin exhibits moderate separation ability of actinides(III) from lanthanides(III) at relatively high HNO concentration.