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Kazuya Matsumoto
Department of Materials Science, Graduate School of Engineering Science, Akita University, 1-1 Tegatagakuen-machi, Akita-shi, Akita 010-8502, Japan

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Journal article
Published: 01 April 2021 in Separations
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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).

ACS Style

Kazuya Matsumoto; Yuto Sezaki; Yuki Hata; Mitsutoshi Jikei. Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant. Separations 2021, 8, 40 .

AMA Style

Kazuya Matsumoto, Yuto Sezaki, Yuki Hata, Mitsutoshi Jikei. Selective Recovery of Platinum (IV) from HCl Solutions Using 2-Ethylhexylamine as a Precipitant. Separations. 2021; 8 (4):40.

Chicago/Turabian Style

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

Paper
Published: 20 May 2020 in Polymer Chemistry
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Aromatic polyketones were successfully synthesized by Friedel–Crafts acylation using AlCl3 between aromatic dicarboxylic acid chlorides and 2,2′-dimethoxybiphenyl under both stoichiometric and nonstoichiometric conditions.

ACS Style

Kazuya Matsumoto; Chisa Fukui; Riku Shoji; Mitsutoshi Jikei. Synthesis of aromatic polyketones by nonstoichiometric Friedel–Crafts polycondensation using AlCl3. Polymer Chemistry 2020, 11, 4221 -4227.

AMA Style

Kazuya Matsumoto, Chisa Fukui, Riku Shoji, Mitsutoshi Jikei. Synthesis of aromatic polyketones by nonstoichiometric Friedel–Crafts polycondensation using AlCl3. Polymer Chemistry. 2020; 11 (26):4221-4227.

Chicago/Turabian Style

Kazuya Matsumoto; Chisa Fukui; Riku Shoji; Mitsutoshi Jikei. 2020. "Synthesis of aromatic polyketones by nonstoichiometric Friedel–Crafts polycondensation using AlCl3." Polymer Chemistry 11, no. 26: 4221-4227.

Journal article
Published: 29 February 2020 in Metals
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The selective recovery of platinum-group metals (PGMs) remains a huge challenge. Although solvent extraction processes are generally used for PGM separation, the use of organic solvents is problematic because of their toxicity and environmental concerns. Here, we have developed a new PGM recovery method by precipitation from hydrochloric acid (HCl) solutions containing Pd(II), Pt(IV), and Rh(III) using aliphatic primary amines as precipitants. Pt(IV) was precipitated using the amines with alkyl chains longer than hexyl independent of HCl concentration. The precipitation of Pd(II) required longer alkyl amines than octyl, regardless of the HCl concentration. Rh(III) was recovered by precipitation at high HCl concentrations using the amines longer than hexyl. The mutual separation of Pt(IV), Rh(III), and Pd(II), in this order, was successfully achieved by changing the HCl concentrations and alkyl chain lengths of the amines. X-ray photoelectron spectroscopy and thermogravimetric analysis evidently showed that the metal-containing precipitates were ion-pair complexes composed of metal chloro-complex anions and ammonium cations.

ACS Style

Kazuya Matsumoto; Yuto Sezaki; Sumito Yamakawa; Yuki Hata; Mitsutoshi Jikei. Selective and Mutual Separation of Palladium (II), Platinum (IV), and Rhodium (III) Using Aliphatic Primary Amines. Metals 2020, 10, 324 .

AMA Style

Kazuya Matsumoto, Yuto Sezaki, Sumito Yamakawa, Yuki Hata, Mitsutoshi Jikei. Selective and Mutual Separation of Palladium (II), Platinum (IV), and Rhodium (III) Using Aliphatic Primary Amines. Metals. 2020; 10 (3):324.

Chicago/Turabian Style

Kazuya Matsumoto; Yuto Sezaki; Sumito Yamakawa; Yuki Hata; Mitsutoshi Jikei. 2020. "Selective and Mutual Separation of Palladium (II), Platinum (IV), and Rhodium (III) Using Aliphatic Primary Amines." Metals 10, no. 3: 324.

Journal article
Published: 09 September 2019 in Polymer Journal
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Long-chain-branched poly(aryl ether sulfone)-poly(tetrahydrofuran) multiblock copolymers (PES-BPTHF) composed of hard linear and soft branching segments were synthesized from bromo-terminated poly(tetrahydrofuran) and hydroxy-terminated poly(aryl ether sulfone). A study on the effect of concentration on polymerization behavior revealed that soluble powder was obtained at the optimized reaction concentration of 7 wt%. Gelation and intramolecular cyclization were observed at high and low concentrations, respectively. The microphase-separated morphology of PES-BPTHF was confirmed by atomic force microscopy, small-angle X-ray scattering (SAXS), and dynamic mechanical analysis (DMA) measurements. Fewer entangled poly(tetrahydrofuran) segments were detected in PES-BPTHF than in PES-PTHF by SAXS, DMA and tensile measurements. Rheological measurements suggested high chain entanglement of PES-BPTHF in its melt phase. It is interesting to note that the polymer chains in the soft domains become less entangled and more reminiscent of hyperbranched architectures, whereas the overall chain entanglements are increased due to the long-chain-branched structure.

ACS Style

Mitsutoshi Jikei; Ai Sato; Lam Tho Ha; Mao Takeda; Kazuya Matsumoto; Masataka Sugimoto; Hiroaki Sato; Go Matsuba. Synthesis and properties of long-chain-branched poly(aryl ether sulfone)-poly(tetrahydrofuran) multiblock copolymers. Polymer Journal 2019, 52, 179 -188.

AMA Style

Mitsutoshi Jikei, Ai Sato, Lam Tho Ha, Mao Takeda, Kazuya Matsumoto, Masataka Sugimoto, Hiroaki Sato, Go Matsuba. Synthesis and properties of long-chain-branched poly(aryl ether sulfone)-poly(tetrahydrofuran) multiblock copolymers. Polymer Journal. 2019; 52 (2):179-188.

Chicago/Turabian Style

Mitsutoshi Jikei; Ai Sato; Lam Tho Ha; Mao Takeda; Kazuya Matsumoto; Masataka Sugimoto; Hiroaki Sato; Go Matsuba. 2019. "Synthesis and properties of long-chain-branched poly(aryl ether sulfone)-poly(tetrahydrofuran) multiblock copolymers." Polymer Journal 52, no. 2: 179-188.

Research article
Published: 29 August 2019 in ACS Omega
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A new Rh(III) separation method using metal-containing hydrochloric acid (HCl) solutions has been developed. This method includes Rh(III) precipitation with high selectivity using aromatic primary diamines as precipitants. The compound p-phenylene diamine dihydrochloride (PPDA) successfully precipitates only Rh(III) from HCl solutions containing Pd(II), Pt(IV), and Rh(III). Furthermore, highly selective Rh(III) recovery from the simulated spent catalyst leach solution, comprising Pd, Pt, Rh, Ce, Al, Ba, Zr, La, and Y in 5 M HCl, was achieved using PPDA. Single-crystal X-ray analysis revealed that the Rh(III)-containing precipitate using PPDA forms three-dimensional ionic crystals comprising the [RhCl6]3–/ammonium form of PPDA/chloride anion/H2O at a 1:2:1:2 ratio. Formation of these unique ionic crystals plays a key role in the highly selective Rh(III) recovery. This Rh(III) recovery method will be promising for use in the purification process of Rh as well as the practical Rh recovery from spent catalysts.

ACS Style

Kazuya Matsumoto; Yuki Hata; Yuto Sezaki; Hiroshi Katagiri; Mitsutoshi Jikei. Highly Selective Rh(III) Recovery from HCl Solutions Using Aromatic Primary Diamines via Formation of Three-Dimensional Ionic Crystals. ACS Omega 2019, 4, 14613 -14620.

AMA Style

Kazuya Matsumoto, Yuki Hata, Yuto Sezaki, Hiroshi Katagiri, Mitsutoshi Jikei. Highly Selective Rh(III) Recovery from HCl Solutions Using Aromatic Primary Diamines via Formation of Three-Dimensional Ionic Crystals. ACS Omega. 2019; 4 (11):14613-14620.

Chicago/Turabian Style

Kazuya Matsumoto; Yuki Hata; Yuto Sezaki; Hiroshi Katagiri; Mitsutoshi Jikei. 2019. "Highly Selective Rh(III) Recovery from HCl Solutions Using Aromatic Primary Diamines via Formation of Three-Dimensional Ionic Crystals." ACS Omega 4, no. 11: 14613-14620.

Journal article
Published: 27 August 2019 in Scientific Reports
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Although Rh is an industrially important and the most expensive platinum group metal (PGM), the selective and preferential separation of Rh from PGM mixtures still remains as a big challenge. In this work, the separation of Rh (III) from Pd (II) and Pt (IV) in a hydrochloric acid (HCl) solution was studied using a m-phenylene diamine-containing precipitant (m-PDA). At high HCl concentrations (6.0–8.0 M), most of the Rh (III) (>90%) was precipitated, and Pd (II) and Pt (IV) were hardly precipitated (<5%). On the other hand, over 85% of Pd (II) and Pt (IV) precipitated along with small amount of Rh (III) (<25%) at low HCl concentrations (1.0–2.0 M). As a consequence, m-PDA enabled selective and preferential precipitation of Rh (III) at high HCl concentrations. XPS and TG analyses revealed that the Rh-containing precipitate is an ion-pair complex composed of one [RhCl6]3− anion and three m-PDA cations. The Rh desorption from the precipitate as well as the recovery of m-PDA was successfully achieved using an NH4OH solution. This method is a promising practical approach to Rh recovery.

ACS Style

Kazuya Matsumoto; Sumito Yamakawa; Kazutoshi Haga; Katsuyuki Ishibashi; Mitsutoshi Jikei; Atsushi Shibayama. Selective and Preferential Separation of Rhodium (III) from Palladium (II) and Platinum (IV) Using a m-Phenylene Diamine-Containing Precipitant. Scientific Reports 2019, 9, 1 -8.

AMA Style

Kazuya Matsumoto, Sumito Yamakawa, Kazutoshi Haga, Katsuyuki Ishibashi, Mitsutoshi Jikei, Atsushi Shibayama. Selective and Preferential Separation of Rhodium (III) from Palladium (II) and Platinum (IV) Using a m-Phenylene Diamine-Containing Precipitant. Scientific Reports. 2019; 9 (1):1-8.

Chicago/Turabian Style

Kazuya Matsumoto; Sumito Yamakawa; Kazutoshi Haga; Katsuyuki Ishibashi; Mitsutoshi Jikei; Atsushi Shibayama. 2019. "Selective and Preferential Separation of Rhodium (III) from Palladium (II) and Platinum (IV) Using a m-Phenylene Diamine-Containing Precipitant." Scientific Reports 9, no. 1: 1-8.

Research article
Published: 23 January 2019 in ACS Omega
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Rhodium (Rh) is the most expensive platinum group metal (PGM) and is of great industrial importance. Although the recycling of PGMs from secondary sources is in high demand, the preferential and selective separation of Rh from PGM mixtures remains a great challenge. Here, a selective Rh separation method involving the precipitation of Rh from an HCl solution containing palladium (Pd), platinum (Pt), and Rh is reported. 4-Butylaniline and 4-hexylaniline were used as precipitants for Rh, and selective Rh precipitation was achieved at high HCl concentrations. We revealed that Rh in HCl selectively forms a unique and highly stable ion-pair complex comprising [RhCl6]3–/anilinium/chloride ions in a 1:6:3 ratio. The formation and high stability of the Rh complex were found to play important roles in the selective recovery of Rh from PGM mixtures.

ACS Style

Kazuya Matsumoto; Sumito Yamakawa; Yuto Sezaki; Hiroshi Katagiri; Mitsutoshi Jikei. Preferential Precipitation and Selective Separation of Rh(III) from Pd(II) and Pt(IV) Using 4-Alkylanilines as Precipitants. ACS Omega 2019, 4, 1868 -1873.

AMA Style

Kazuya Matsumoto, Sumito Yamakawa, Yuto Sezaki, Hiroshi Katagiri, Mitsutoshi Jikei. Preferential Precipitation and Selective Separation of Rh(III) from Pd(II) and Pt(IV) Using 4-Alkylanilines as Precipitants. ACS Omega. 2019; 4 (1):1868-1873.

Chicago/Turabian Style

Kazuya Matsumoto; Sumito Yamakawa; Yuto Sezaki; Hiroshi Katagiri; Mitsutoshi Jikei. 2019. "Preferential Precipitation and Selective Separation of Rh(III) from Pd(II) and Pt(IV) Using 4-Alkylanilines as Precipitants." ACS Omega 4, no. 1: 1868-1873.

Journals
Published: 12 October 2017 in Polymer Chemistry
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Based on Friedel–Crafts acylation, nonstoichiometric polycondensation was achieved using 4,4′-dicarboxydiphenyl ether and 2,2′-dimethoxybiphenyl in trifluoromethanesulfonic acid.

ACS Style

Kazuya Matsumoto; Takayuki Ogawa; Mitsutoshi Jikei. Nonstoichiometric polycondensation based on Friedel–Crafts acylation in superacids for the syntheses of aromatic polyketones. Polymer Chemistry 2017, 8, 7297 -7300.

AMA Style

Kazuya Matsumoto, Takayuki Ogawa, Mitsutoshi Jikei. Nonstoichiometric polycondensation based on Friedel–Crafts acylation in superacids for the syntheses of aromatic polyketones. Polymer Chemistry. 2017; 8 (47):7297-7300.

Chicago/Turabian Style

Kazuya Matsumoto; Takayuki Ogawa; Mitsutoshi Jikei. 2017. "Nonstoichiometric polycondensation based on Friedel–Crafts acylation in superacids for the syntheses of aromatic polyketones." Polymer Chemistry 8, no. 47: 7297-7300.