Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ueda, Yuki; Eguchi, Ayano; Tokunaga, Kohei; Kikuchi, Kei*; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika
Industrial & Engineering Chemistry Research, 61(19), p.6640 - 6649, 2022/05
Times Cited Count:1 Percentile:11.64(Engineering, Chemical)no abstracts in English
Ueda, Yuki; Morisada, Shintaro*; Kawakita, Hidetaka*; Wenzel, M.*; Weigand, J. J.*; Oto, Keisuke*
Separation and Purification Technology, 277, p.119456_1 - 119456_8, 2021/12
Times Cited Count:5 Percentile:29.15(Engineering, Chemical)no abstracts in English
Ueda, Yuki; Morisada, Shintaro*; Kawakita, Hidetaka*; Oto, Keisuke*
Separations (Internet), 8(9), p.139_1 - 139_15, 2021/09
Times Cited Count:9 Percentile:62.42(Chemistry, Analytical)no abstracts in English
Narita, Hirokazu*; Suzuki, Tomoya*; Motokawa, Ryuhei
Nihon Kinzoku Gakkai-Shi, 81(4), p.157 - 167, 2017/04
Times Cited Count:17 Percentile:62.47(Metallurgy & Metallurgical Engineering)Maeda, Motoki*; Narita, Hirokazu*; Tokoro, Chiharu*; Tanaka, Mikiya*; Motokawa, Ryuhei; Shiwaku, Hideaki; Yaita, Tsuyoshi
Separation and Purification Technology, 177, p.176 - 181, 2017/04
Times Cited Count:22 Percentile:58.37(Engineering, Chemical)Saeki, Morihisa; Taguchi, Tomitsugu; Matsumura, Daiju; Nakashima, Nobuaki*; Oba, Hironori
no journal, ,
no abstracts in English
Ueda, Yuki; Sugita, Tsuyoshi; Okamura, Hiroyuki; Shimojo, Kojiro; Naganawa, Hirochika; Morisada, Shintaro*; Kawakita, Hidetaka*; Oto, Keisuke*
no journal, ,
Platinum group metals (PGMs) are indispensable metals in modern industries and are used for example as active components in automobile gas catalysts, jewellery goods, electronic devices and dental materials. In order to meet the growing demand, high efficient receptors for liquid-liquid extraction of the respective anionic chloro-complexes are required in order to enhance capable winning from either pour geological deposits or complex secondary sources within the Urban Mining. The ligand containing urea or amide groups can form the hydrogen bond with anionic species. The novel urea or amide containing extractants were synthesized and its extraction behavior and mechanism were investigated in this work.
Ueda, Yuki; Sugita, Tsuyoshi; Okamura, Hiroyuki; Shimojo, Kojiro; Naganawa, Hirochika; Morisada, Shintaro*; Kawakita, Hidetaka*; Oto, Keisuke*
no journal, ,
Platinum group metals (PGMs) are indispensable metals in modern industries and are used for example as active components in automobile gas catalysts, jewelry goods, electronic devices and dental materials. In order to meet the growing demand, high efficient extraction reagents for liquid-liquid extraction of the respective anionic chloro-complexes are required in order to enhance capable winning from either pour geological deposits or complex secondary sources within the Urban Mining. The ligand containing urea or amide groups can form the hydrogen bond with anionic species. The novel urea or amide containing extraction reagents were synthesized and its extraction behavior and mechanism were investigated in this work.
Ueda, Yuki; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika; Shimojo, Kojiro
no journal, ,
The separation and recovery of PGM is carried out by a hydrometallurgy process mainly based on a solvent extraction method. In recent years, development of alternative solvents for such volatile organic solvents has been advanced. Ionic liquids (IL) has attracted substantial interest in many fields as a green alternative solvent due to their non-volatile, non-flammable, and thermally stable properties. Task-specific ionic liquids (TSIL) that functionalized by incorporating ligating group can give the extraction ability for metal ions. Many extraction systems using IL and TSIL aimed at separating PGM have been reported so far, however there is no extraction system that achieves individual separation of Pd and Pt by one type of TSIL. In this study, imidazolium bis(trifluoromethanesulfonyl) imide type TSIL incorporating a urea group was synthesized and its extraction ability for Pd and Pt was evaluated from a viewpoint the individual separation of Pd and Pt.
Ueda, Yuki; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika; Shimojo, Kojiro
no journal, ,
Recycling of platinum group metals (PGM) is actively carried out from the viewpoint of stable supply of resources. There are few separating reagents that can separate PGM from each other, and development of a highly selective separating reagent is required. Ionic liquids (IL) are salts with the melting points below 100 degrees Celsius. An ionic liquid can be used as an alternative solvent instead of an organic solvent due to excellent chemical properties such as nonvolatility and nonflammability. In addition, IL can extract charged chemical species and can be functionalized by chemical modification. In this study, we synthesized a novel urea-substituted IL to achieve mutual separation of Pt(IV) and Pd(II). The novel IL synthesized in this study achieved mutual separation of Pt(IV) and Pd(II). Furthermore, spectroscopic analysis of the extraction mechanism revealed that Pt(IV) and Pd(II) were extracted by different extraction mechanisms.
Ueda, Yuki; Sugita, Tsuyoshi; Okamura, Hiroyuki; Naganawa, Hirochika; Shimojo, Kojiro
no journal, ,
Recycling of platinum group metals (PGM) is actively carried out from the viewpoint of stable supply of resources. There are few separating reagents that can separate PGM from each other, and development of a highly selective separating reagent is required. Ionic liquids (IL) are salts with the melting points below 100 degrees Celsius. An ionic liquid can be used as an alternative solvent instead of an organic solvent due to excellent chemical properties such as nonvolatility and nonflammability. In addition, IL can extract charged chemical species and can be functionalized by chemical modification. In this study, we synthesized a novel urea-substituted IL to achieve mutual separation of Pt(IV) and Pd(II). The novel IL synthesized in this study achieved mutual separation of Pt(IV) and Pd(II). Furthermore, spectroscopic analysis of the extraction mechanism revealed that Pt(IV) and Pd(II) were extracted by different extraction mechanisms.
Ueda, Yuki; Kikuchi, Kei
no journal, ,
Platinum (Pt) and palladium are used for an exhaust gas catalysts, and the recycling of these metals are actively carried out with increasing the demand of Pt and Pd. There are few separating reagents that can separate PGM from each other, and development of a highly selective separating reagent is required. In this study, we synthesized the urea and thiourea substituted ionic liquids (IL) to achieve mutual separation of Pt(IV) and Pd(II) from the view point of IL can extract charged chemical species and can be functionalized by chemical modification. The urea and thiourea type of IL can selectively extract Pt(IV) and Pd(II) at lower pH region, respectively. Furthermore, spectroscopic analysis of the extraction mechanism revealed that Pt(IV) and Pd(II) were extracted by different extraction mechanisms.