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A Comprehensive extraction study using a mono-alkylated diglycolamic acid extractant; Comparison between a secondary amide group and a tertiary amide group

Sugita, Tsuyoshi   ; Fujiwara, Iori*; Okamura, Hiroyuki   ; Oshima, Tatsuya*; Baba, Yoshinari*; Naganawa, Hirochika  ; Shimojo, Kojiro   

We investigated an influence of amide group in diglycolamic acid-type extractants on extraction property of metal ions. The extraction characteristics of $$N$$-dodecyldiglycolamic acid (C$$_{12}$$DGAA), with a secondary amide group, for 56 metal ions have been investigated, and compared with those of $$N,N$$-dioctyldiglycolamic acid (DODGAA) with a tertiary amide group. Compared with DODGAA, C$$_{12}$$DGAA has a poor extraction performance and separation ability for rare-earth metal ions, except for Sc(III). However, C$$_{12}$$DGAA tended to provide better extraction for relatively small-sized metal ions than DODGAA. In addition, it was found that C$$_{12}$$DGAA enables the selective removal of Hg(II) from aqueous solutions containing various divalent metal ions.



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