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, Yu Kurusu, Kosuke Akasaka, Tetsutaro Hattori

Research output: Contribution to journalArticlepeer-review

Abstract

The extraction ability of 1,3-diaminocalix[4]arene (2: H2L) toward platinum group metals (PGMs) has been investigated, which revealed that2is able to extract Pd(ii) and Pt(ii) from hydrochloric acidviadifferent 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 PtCl3are sandwiched between two H3L+, in which one amino nitrogen directly coordinates to a PtCl3species 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 Clin the aqueous phase. Finally, from the extracted organic phase, back-extraction of Pd(ii) and Pt(ii) was easily performed, respectively.

Original languageEnglish
Pages (from-to)35473-35479
Number of pages7
JournalRSC Advances
Volume10
Issue number58
DOIs
Publication statusPublished - 2020 Sep 28

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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