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Extraction of Pd( ii ) and Pt( ii ) from aqueous hydrochloric acid with 1,3-diaminocalix[4]arene: switching of the extraction selectivity by using different extraction modes by Morohashi, Naoya; Kurusu, Yu; Akasaka, Kosuke; Hattori, Tetsutaro is a Materials Science article available to read on EtoBox.

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The extraction ability of 1,3-diaminocalix[4]arene (2: HL) toward platinum group metals (PGMs) has been investigated, which revealed that 2 is able to extract Pd(ii) and Pt(ii) from hydrochloric acid different extraction modes. The extraction species for Pd(ii) and Pt(ii) are [PdL] and [PtCl(HL)], respectively, as evidenced by equilibrium analysis and X-ray crystallography. In [PdL], the two phenoxide oxygens and two amino nitrogens of L coordinate to the Pd ion. On the other hand, in [PtCl(HL)], two anionic trichloro complexes PtCl are sandwiched between two HL, in which one amino nitrogen directly coordinates to a PtCl species and another protonated amino group forms an ion pair with another PtCl . Utilizing the different extraction modes, switching of the extraction selectivity has been achieved in the competitive extraction between Pd(ii) and Pt(ii) by varying the concentrations of H and Cl in the aqueous phase. Finally, from the extracted organic phase, back-extraction of Pd(ii) and Pt(ii) was easily performed, respectively.

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Author

Morohashi, Naoya; Kurusu, Yu; Akasaka, Kosuke; Hattori, Tetsutaro

Publisher

The Royal Society of Chemistry; Royal Society of Chemistry; Cambridge: RSC Publishing; Royal Society of Chemistry (RSC) (ISSN 2046-2069)

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)