Next Article in Journal
Easy Computation of the Various Topologies and Modes of Liquid–Liquid Partition Chromatography by the Theory of Random Walks
Next Article in Special Issue
New Concept for the Study of the Fluid Dynamics of Lithium Extraction Using Calix[4]arene Derivatives in T-Type Microreactor Systems
Previous Article in Journal
Potentiality of Azolla pinnata R. Br. for Phytoremediation of Polluted Freshwater with Crude Petroleum Oil
Article

Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant

Department of Materials Science, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita-shi, Akita 010-8502, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Keisuke Ohto and Sascha Nowak
Separations 2021, 8(4), 40; https://doi.org/10.3390/separations8040040
Received: 5 March 2021 / Revised: 17 March 2021 / Accepted: 24 March 2021 / Published: 1 April 2021
The selective separation and recovery of specific platinum-group metals (PGMs) from metal mixtures is a significant challenge owing to the similarity of these metals in terms of chemical and physical properties. Among the typical PGMs (Pd, Pt, and Rh), the selective recovery of Pt prior to the recovery of Pd and Rh is in high demand. In this study, we attempted the selective precipitation of Pt(IV) from mixed-metal HCl solutions using 2-ethylhexylamine (2EHA) as a precipitant and achieved the selective precipitation of Pt(IV) from Pd(II) and Rh(III) over a wide range of HCl concentrations. Selective precipitation of Pt(IV) was also achieved from HCl solutions with high levels of base metals, such as Al, Cu, Fe, and Zn. High yields of undegraded 2EHA remaining in the HCl solution after Pt(IV) precipitation were recovered using hydrophobic porous resins. X-ray photoelectron spectroscopy and thermogravimetric measurements revealed that the Pt(IV)-containing precipitate was an ion-pair comprising one [PtCl6]2− and two ammonium cations of 2EHA. The steric hindrance and high hydrophilicity of 2EHA suppressed the formation of Rh(III)- and Pd(II)-containing precipitates, respectively, resulting in the selective precipitation of Pt(IV). View Full-Text
Keywords: platinum-group metal; metal precipitation; ion-pair; 2-ethylhexylamine; hydrochloric acid platinum-group metal; metal precipitation; ion-pair; 2-ethylhexylamine; hydrochloric acid
Show Figures

Figure 1

MDPI and ACS Style

Matsumoto, K.; Sezaki, Y.; Hata, Y.; Jikei, M. Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant. Separations 2021, 8, 40. https://doi.org/10.3390/separations8040040

AMA Style

Matsumoto K, Sezaki Y, Hata Y, Jikei M. Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant. Separations. 2021; 8(4):40. https://doi.org/10.3390/separations8040040

Chicago/Turabian Style

Matsumoto, Kazuya, Yuto Sezaki, Yuki Hata, and Mitsutoshi Jikei. 2021. "Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant" Separations 8, no. 4: 40. https://doi.org/10.3390/separations8040040

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop