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Platinum group metals separation with ionic liquids and fluorinated extraction systems

Séminaire Chimie ED459

Dr. Yuki Ueda, Researcher (Materials Science Research Center, JAEA Japan Atomic Energy Agency, Ibaraki, Japan)

Le Jeudi 06 Octobre 2022 à 14h

ENSCM, salle de cours SDC 8 (campus Balard, 240 av. Émile-Jeanbrau — aile C, 2e étage / escalier face amphi Godechot)

Date de début : 2022-10-06 14:00:00

Date de fin : 2022-10-06 15:30:00

Lieu : ENSCM salle SDC 8 (campus Balard, 240 av E. Jeanbrau, aile C 2e étg)

Intervenant : Dr. Yuki Ueda, Researcher

Materials Science Research Center, JAEA Japan Atomic Energy Agency, Ibaraki, Japan

Overview of solvent extraction methods and development of extraction systems for separation and refining of metal resources

Securing a stable supply of rare metal resources, which are essential for high-tech industries, is an important global issue. An efficient method of recycling of from secondary resources is required to ensure a steady supply of these valuable metals and to allow for the recent global trends toward carbon neutrality. The separation and purification of metal ions are currently carried out using hydrometallurgical processes based precipitation crystallization, adsorption with ion exchange resins or activated carbon, electrolytic refining, cementation, solvent extraction. Among these separation methods, solvent extraction (SX) is widely used both in all over the world. Schematic diagram of SX method is shown in Fig. 1.

Solvent extraction is a separation technique that uses a biphasic system with immiscible organic and aqueous solutions. Generally, the organic phase is an organic compound (extractant) with high affinity for a particular metal diluted with an organic solvent (diluent). The solvent extraction method has the advantages of high selectivity, high extraction capacity, operation at room temperature, closed system capability, and continuous operation. The selectivity of the solvent extraction process is highly dependent on the extractant; therefore, development of extractant is an important component of solvent extraction research. I have been developing extraction systems with high selectivity and extraction ability.

In this lecture, I will first explain the basics of SX. Then, I will introduce the extraction systems I have researched and developed. One (Fig. 2a) uses ionic liquids for the mutual separation of platinum and palladium. The other (Fig. 2b) is a superhydrophobic fluorous extraction system to solve a long-standing problem in SX: the formation of a third phase. I hope this lecture will get your interest in solvent extraction and the development of new extraction systems.

See illustrations in attached PDF abstract :

Figure 1. Schematic diagram of solvent extraction.

Figure 2. Fluorous extraction systems: (a) Urea-imidazolium / bis(CF3)sulfonimide based ionic liquid ; (b) Superhydrophobic tris(nonafluoroheptyl)phosphate.



Dr. Ueda obtained his PhD (Engineering) from Saga University, Japan, in 2017 in the field of separation engineering. He worked as a postdoc researcher at JAEA (2017–2020) and started to research of design and synthesis of extraction reagents. He then became a permanent staff of JAEA in 2020, and is currently a researcher of the institute. His recent research mainly focuses on the development of separation techniques for radionuclides using liquid–liquid extraction methods. The main research fields are nuclear and metal separation chemistry.


1. Yuki Ueda, Ayano Eguchi, Kohei Tokunaga, Kei Kikuchi, Tsuyoshi Sugita, Hiroyuki Okamura, Hirochika Naganawa, Urea-introduced ionic liquid for the effective extraction of Pt(IV) and Pd(II) ions, Ind. Eng. Chem. Res. 2022, 61: 6640–6649. DOI : 10.1021/acs.iecr.2c00304

2. Yuka Isozaki, Seiya Higashiharaguchi, Naoya Kaneko, Shun Yamazaki, Tatsuo Taniguchi, Takashi Karatsu, Yuki Ueda, Ryuhei Motokawa, Polymer photonic crystals prepared by triblock copolymerization-induced in situ microphase separation, Chem. Lett. 2022, 51: 625–628. DOI : 10.1246/cl.220089

3. Kazuhiro Akutsu-Suyama, Norifumi L. Yamada, Yuki Ueda, Ryuhei Motokawa, Hirokazu Narita, New design of a sample cell for neutron reflectometry in liquid–liquid systems and its application for studying structures at air–liquid and liquid–liquid interfaces, Appl. Sci. 2022, 12: 1215. DOI : 10.3390/app12031215

4. Yuki Ueda, Shintaro Morisada, Hidetaka Kawakita, Marco Wenzel, Jan J. Weigand, Keisuke Ohto, Effective extraction of Pt(IV) as [PtCl6]2– from hydrochloric acid using a simple urea extractant, Sep. Purif. Technol. 2021, 277: 119456–119456. DOI : 10.1016/j.seppur.2021.119456

5. Yuki Ueda, Kei Kikuchi, Kohei Tokunaga, Tsuyoshi Sugita, Noboru Aoyagi, Kazuya Tanaka, Hiroyuki Okamura, A fluorous phosphate for the effective extraction of LnIII from nitrate media: comparison with a conventional organic phosphate, Solvent Extr. Ion Exch. 2021, 39: 491–511. DOI : 10.1080/07366299.2021.1874115

6. Yuki Ueda, Shintaro Morisada, Hidetaka Kawakita, Keisuke Ohto, Selective extraction of platinum(IV) from the simulated secondary resources using simple secondary amide and urea extractants, Separations 2021, 8: 139. DOI : 10.3390/separations8090139

7. Takuya Okudaira, Yuki Ueda, Kosuke Hiroi, Ryuhei Motokawa, Yasuhiro Inamura, Shinichi Takata, Takayuki Oku, Jun-ichi Suzuki, Shingo Takahashi, Hitoshi Endo, Hiroki Iwase, Polarization analysis for small-angle neutron scattering with a 3He spin filter at a pulsed neutron source, J. Appl. Crystallogr. 2021, 54: 548–556. DOI : 10.1107/s1600576721001643

8. Yuki Ueda, Kei Kikuchi, Tsuyoshi Sugita, Ryuhei Motokawa, Extraction performance of a fluorous phosphate for Zr(IV) from HNO3 solution: comparison with tri-n-butyl phosphate, Solvent Extr. Ion Exch. 2019, 37: 347–359. DOI : 10.1080/07366299.2019.1638015

9. Maria Atanassova, Hiroyuki Okamura, Ayano Eguchi, Yuki Ueda, Tsuyoshi Sugita, Kojiro Shimojo, Extraction ability of 4-benzoyl-3-phenyl-5-isoxazolone towards 4f-ions into ionic and molecular media, Anal. Sci. 2018, 34: 973–978. DOI : 10.2116/analsci.18p166

10. Yuki Ueda, Shintaro Morisada, Hidetaka Kawakita, Keisuke Ohto, High extraction ability and selectivity of a tripodal pivalamide derivative for Pt(IV) from hydrochloric acid solutions, Sep. Sci. Technol. 2016, 51: 2700–2707. DOI : 10.1080/01496395.2016.1168846

Contact local ICSM : Dr. Damien Bourgeois

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