Extraction and Separation of Pt and Pd by an Imidazolium-Based Ionic Liquid Combined with Phosphonium Chloride

Kubota, F.; Shigyo, Eiko; Yoshida, Wataru; Goto, Masahiro

doi:10.15261/serdj.24.97

Cited by 20 publications

(18 citation statements)

References 21 publications

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“…If a PGM other than Pd could be selectively extracted from a mixture of PGMs, the extraction process could be considerably simplied. However, such examples are quite rare in the literature, [18][19][20] because the ligand exchange and chloro complex formation of Pd is the fastest among the PGMs.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The growing interest in ILs is because of their unique properties, such as their low volatility, low flammability, and low melting point (Regel-rosocka and Wisniewski, 2011). It has recently been found that ILs themselves possess high extraction ability and selectivity for some metal ions, and their application as an extraction solvent (extractant) without dilution has been intensively studied (Yang et al, 2014;Svecova et al, 2016;Kubota et al, 2017). Undiluted phosphonium-based ILs have been applied to the recovery of various metals, such as precious and transition metals (Wellens et al, 2012;Vander Hoogerstraete et al, 2013;Firmansyah et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Selective Recovery of Platinum Group Metals from Spent Automotive Catalysts by Leaching and Solvent Extraction

Firmansyah

Kubota

Goto

2019

J. Chem. Eng. Japan / JCEJ

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Platinum group metals (PGMs) play an important role in the automotive industry as key components of exhaust catalysts. Recycling of PGMs from secondary resources, such as waste products, is encouraged to ensure their sustainability. A highly e cient and environmentally benign technique for the separation of PGMs is currently required. In the present study, the recovery of PGMs from a spent automotive catalyst was investigated using the trioctyldodecyl phosphonium chloride (P 8,8,8,12 Cl) ionic liquid (IL) as the PGM extraction solvent. First, leaching from the catalyst was investigated. Pt and Pd are selectively extracted into undiluted P 8,8,8,12 Cl from the 5 mol L 1 HCl leachate containing various metals together with Pt, Pd, and Rh. Subsequently, Rh is extracted into fresh P 8,8,8,12 Cl from the ra nate adjusted to an appropriate HCl concentration. Mutual separation of Pt and Pd is possible by stripping processes. Some common metals coextracted with PGMs, such as Fe, Cu, and Zn, are removed by each stripping process. Recovery of high purity Pt, Pd, and Rh is achieved by the proposed recycling process. The results demonstrate that separation using phosphonium-based ILs is useful for recycling PGMs.

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“…(Kozonoi & Ikeda, 2007). Regarding metals found in WEEE, these ILs were found to be efficient at extracting precious metals such as Au(III), Pt(IV) or Ir(IV) from acidic aqueous solutions containing large amounts of HCl (Génand-Pinaz et al, 2013;Papaiconomou et al, 2012Papaiconomou et al, & 2014Yang et al, 2014;Tong et al, 2015;Kubota et al, 2017 (Parmentier et al, 2015a) and was employed in a continuous selective metal extraction process for the recovery of cobalt from two mixed salt solutions (Co/Na, Ca/Co/K) (Parmentier et al, 2015b Figure 9. This process clearly shows the potential of ILs to recover metals from complex aqueous solutions using careful selection of the ILs and understanding their influence on the metal extracted complex (chloride vs. nitrate, etc).…”

Section: Cation Mediated Leachingmentioning

confidence: 99%

Recovery of metals from waste electrical and electronic equipment (WEEE) using unconventional solvents based on ionic liquids

Schaeffer

Passos

Billard

et al. 2018

Critical Reviews in Environmental Science and Technology

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Waste electrical and electronic equipment (WEEE) is the fastest growing type of waste globally and is an important challenge due to its heterogeneity, intrinsic toxicity and potential environmental impact. However, WEEE also represents an important secondary source of critical and valuable elements and must be viewed as a resource within the context of a circular economy. The use of ionic liquids (ILs) to recover metals from WEEE is reviewed with a special emphasis on the use of ILs in leaching and solvent extraction processes. The advantages of ILs as a reaction medium compared to existing conventional solvents lies in their tuneability and potential environmental benefits. Many studies have used ILs for the selective extraction and purification of metals from WEEE, particularly from waste fluorescent lamp phosphor and batteries containing rare-earth elements with promising results. However, significant barriers remain to the commercial use of ILs for treating WEEE and key barriers to progress are identified. In particular more focus is required to improve upstream collection and separation of WEEE, as this would greatly increase the potential to use selective, more efficient, ILs for metal recovery.

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Extraction and Separation of Pt and Pd by an Imidazolium-Based Ionic Liquid Combined with Phosphonium Chloride

Cited by 20 publications

References 21 publications

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

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

Selective Recovery of Platinum Group Metals from Spent Automotive Catalysts by Leaching and Solvent Extraction

Recovery of metals from waste electrical and electronic equipment (WEEE) using unconventional solvents based on ionic liquids

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