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Journal Articles

Solvent extraction of platinum group metals from urban mine by diglycolamide with soft donor atoms

Sasaki, Yuji; Nakase, Masahiko*

Petorotekku, 43(11), p.782 - 787, 2020/11

As analog compounds of DGA (diglycolamide), MIDOA(methylimino-diacetamide) and TDGA(thia-diglycolammide) are used for the extractants of platinum group metals. These extractants can be extracted noble metals and oxyanions, which followed by HSAB theory. The high concentration of these metals can be also extracted by these compounds. The research of metal-complex structures gives the information on the ability and role for complex-formation, which will be useful for the development of novel extractants.

Journal Articles

Selenium oxyanions; Highly selective uptake by a novel anion exchanger

Kozai, Naofumi; Onuki, Toshihiko; Komarneni, S.*

Journal of Materials Chemistry, 17(12), p.2993 - 2996, 2002/12

Here we report the extremely high and selective uptake of selenium oxyanions by a novel exchanger, Ni $_{1-x}$ Zn $_{2x}$ (OH) $_{2}$ (OCOCH $_{3}$ ) $_{2x}$ ・nH $_{2}$ O that has brucite-type hydroxide layers with OCOCH $_{3}$ anions in the interlayers. This Ni-Zn basic salt exhibited very high selectivity for Se(IV) (Kd = 9.0x10 $^{4}$ ml/g with an initial Se(IV) concentration of 1x10 $^{-4}$ M) in the presence of 0.1M Cl $^{-}$ solution while the well known anionic clay, Mg $_{2}$ Al(OH) $_{6}$ NO $_{3}$ ・nH $_{2}$ O showed a Kd of 6.0x10 $^{3}$ ml/g under the same conditions. The uptake of Se(IV) on the Ni-Zn basic salt was found to be irreversible when treated with solutions containing 1N Cl $^{-}$ , 1N NO $_{3}$ $^{-}$ , or 1N PO $_{4}$ $^{3-}$ , while the Se(IV) sorbed on anionic clay was easily desorbed in a 1M Cl $^{-}$ solution. This novel exchanger also showed high Kd (2.610 $^{3}$ ml/g at an initial Se concentration of 110 $^{-4}$ M) for Se(VI) and therefore it is expected to be useful for decontamination and removal of selenium oxyanions from contaminated water.