Issue 58, 2020, Issue in Progress
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RSC Advances

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†

Naoya Morohashi, ORCID logo *a   Yu Kurusu,a   Kosuke Akasakaa  and  Tetsutaro Hattori ORCID logo *a  

* Corresponding authors

a Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, 6-6-11 Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan
E-mail: morohashi@orgsynth.che.tohoku.ac.jp, tetsutaro.hattori@tohoku.ac.jp

Abstract

The extraction ability of 1,3-diaminocalix[4]arene (2: H2L) toward platinum group metals (PGMs) has been investigated, which revealed that 2 is able to extract Pd(II) and Pt(II) from hydrochloric acid via different extraction modes. The extraction species for Pd(II) and Pt(II) are [PdL] and [Pt2Cl6(H3L)2], respectively, as evidenced by equilibrium analysis and X-ray crystallography. In [PdL], the two phenoxide oxygens and two amino nitrogens of L2− coordinate to the Pd ion. On the other hand, in [Pt2Cl6(H3L)2], two anionic trichloro complexes PtCl3− are sandwiched between two H3L+, in which one amino nitrogen directly coordinates to a PtCl3− species and another protonated amino group forms an ion pair with another PtCl3−. 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.

Graphical abstract: 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

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Article information

DOI
https://doi.org/10.1039/D0RA05339B
Article type
Paper
Submitted
18 Jun 2020
Accepted
10 Sep 2020
First published
28 Sep 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 35473-35479

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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

N. Morohashi, Y. Kurusu, K. Akasaka and T. Hattori, RSC Adv., 2020, 10, 35473 DOI: 10.1039/D0RA05339B

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