Extractant structures and their performance for palladium extraction and separation from chloride media: A review

Wang, Junlian; Xu, W.; Liu, Hui; Yu, Fengshan; Wang, Huajun

doi:10.1016/j.mineng.2021.106798

Cited by 38 publications

(19 citation statements)

References 125 publications

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“…due to their high porosity and stability. [25][26][27][28] Another advantage of using a MOF is that appropriate functional groups can be incorporated in it, in order to tune its selectivity and adsorption efficiency. 29 By adopting a post-synthetic modification strategy, it is possible to modify the functional groups in UiO-66-NH 2 , to make it more selective for specific metal ions.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient post-synthetically modified UiO-66 MOF for the extraction of Pd(ii) from aqueous solutions: experimental and theoretical studies

et al. 2023

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Section: Introductionmentioning

confidence: 99%

Highly efficient post-synthetically modified UiO-66 MOF for the extraction of Pd(ii) from aqueous solutions: experimental and theoretical studies

et al. 2023

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“…팔라듐은 백금, 로듐, 루테늄, 이리듐, 오스뮴과 함께 백 금족 원소로 불리며, 백금족 중에서 녹는점과 밀도가 가장 낮다. 백금족의 전세계 매장량은 7만 톤에 불과한 것으로 알려져 있으며, 주로 남아공(89.9%), 러시아(5.6%), 짐바브 웨(1.7%) 및 미국(1.3%)에 집중되어 있다 [1]. 팔라듐은 우수한 촉매능력으로 인해 전세계 소비량의 절반 이상이 자동차 촉매변환기에 사용되고 있으며 [2,3], 기타 도금, 보 석, 치과재료 및 각종 전자장비에 사용된다 [4].…”

Section: 서 론unclassified

“…따라서 수 요에 비해 부족한 팔라듐을 원활히 공급하기 위해 2차자 원에서 팔라듐을 회수하기 위한 연구가 활발히 진행되고 있으며, 회수된 팔라듐을 통해 수요의 약 33% 가량을 공 급하고 있다 [5]. 특히, 차량용 촉매에는 평균 0.1~0.3%의 백금족 원소가 함유되어 있어 우수한 도시광산자원으로 불 리며, 이는 천연 광석과 비교해 적게는 수백 배에서 많게 는 수천 배에 달하는 양이다 [1]. 따라서 차량용 폐촉매에 함유된 팔라듐을 회수하기 위한 연구는 활발히 진행되고 로 존재한다 [14].…”

Section: 서 론unclassified

Separation of Pd(II) and Zn(II) by Solvent Extraction using Commercial Extractants from Hydrochloric Acid Leaching Solution of Cemented Pd from Spent Electroplating Solutions

Song¹,

Nguyen²,

Lee³

2022

Korean J. Met. Mater.

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The demand for palladium (Pd) has increased and this has made it necessary to recover pure Pd from diverse secondary resources. To recover the small amount of Pd(II) present in spent electroplating solutions, Pd(II) is concentrated by cementation with zinc metal. In this work, a hydrometallurgical process consisting of leaching and solvent extraction was developed to recover Pd from the cemented Pd. The extraction behavior of Pd(II) and Zn(II) from synthetic HCl solution by commercial extractants such as LIX 63, Cyanex301, DOS, TBP, Alamin 308, Alamine 336 and Aliquat 336 was investigated by varying HCl concentration. The results showed that LIX 63, Cyanex 301 and DOS selectively extracted Pd(II) over Zn(II). These three extractants were employed to separate Pd(II) and Zn(II) from actual leaching solutions with cemented Pd using a mixture of 7.0 M HCl and 0.5% M H2O2 with 2 g/L pulp density at 60oC for 120 min. Cyanex 301 and DOS selectively extracted Pd(II) over Zn(II) from the leaching solution, while a small amount of Zn(II) was co-extracted with Pd(II) by LIX 63. A two stage counter-current extraction of actual leaching solution with LIX 63 resulted in the co-extraction of Zn(II) with Pd(II). The complete stripping of Pd(II) from the loaded Cyanex301 was achieved using either diluted aqua regia or a mixed solution of 5 M HCl and 0.5% NaClO at an A/O ratio of ten. The hydrometallurgical process is proposed to recover a pure Pd(II) solution from cemented Pd.

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“…As a consequence, novel methods to remove metals from industrial and urban wastes are desirable [18][19][20][21][22][23][24][25][26][27]. So far, different methods have shown interesting results: processing of metals using ionic liquids [28][29][30][31], removal of metals using polyphosphonates [32], metal recovery with ion exchange resins [33][34][35][36][37] or solvent extraction [38][39][40][41][42][43] already exhibited good extraction abilities, but in most cases, acidic aqueous solutions or waste pretreatments are necessary to reach the goal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Phase Behavior of a Platform of CO2-Soluble Functional Gradient Copolymers Bearing Metal-Complexing Units

et al. 2022

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The synthesis and characterization of a platform of novel functional fluorinated gradient copolymers soluble in liquid and supercritical CO2 is reported. These functional copolymers are bearing different types of complexing units (pyridine, triphenylphosphine, acetylacetate, thioacetate, and thiol) which are well-known ligands for various metals. They have been prepared by reversible addition–fragmentation chain-transfer (RAFT) polymerization in order to obtain well-defined gradient copolymers. The copolymers have been characterized by proton nuclear magnetic resonance (1H-NMR) spectroscopy, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, thermal gravimetric analysis (TGA), dynamical scanning calorimetry (DSC) and cloud point measurements in dense CO2. All the investigated metal-complexing copolymers are soluble in dense CO2 under mild conditions (pressure lower than 30 MPa up to 65 °C), confirming their potential applications in processes such as metal-catalyzed reactions in dense CO2, metal impregnation, (e.g., preparation of supported catalysts) or metal extraction from various substrates (solid or liquid effluents). Particularly, it opens the door to greener and less energy-demanding processes for the recovery of metals from spent catalysts compared to more conventional pyro- and hydro-metallurgical methods.

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Extractant structures and their performance for palladium extraction and separation from chloride media: A review

Cited by 38 publications

References 125 publications

Highly efficient post-synthetically modified UiO-66 MOF for the extraction of Pd(ii) from aqueous solutions: experimental and theoretical studies

Highly efficient post-synthetically modified UiO-66 MOF for the extraction of Pd(ii) from aqueous solutions: experimental and theoretical studies

Separation of Pd(II) and Zn(II) by Solvent Extraction using Commercial Extractants from Hydrochloric Acid Leaching Solution of Cemented Pd from Spent Electroplating Solutions

Synthesis and Phase Behavior of a Platform of CO2-Soluble Functional Gradient Copolymers Bearing Metal-Complexing Units

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