Liquid-Liquid Extraction of Platinum from Chloride Media by<i>N,N</i>′-Dimethyl-<i>N,N</i>′-Dicyclohexyltetradecylmalonamide

Costa, Maria Clara; Assunção, Ana; Costa, Ana M. Rosa da; Nogueira, Carlos A.; Paiva, Ana Paula

doi:10.1080/07366299.2012.700588

Cited by 30 publications

(7 citation statements)

References 28 publications

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“…One of the first works published about the extraction characteristics of these compounds toward PGMs [36] points out to the importance of including an additional heteroatom within the two amide groups, either oxygen or sulfur, to effectively extract Pd(II). In fact, a few N,N,N′,N′-tetrasubstituted malonamide [37,38] and succinamide [39] derivatives showed a general good affinity toward Pt(IV) extraction but a much more limited performance concerning Pd(II).…”

Section: Extractants Containing Amide Functionsmentioning

confidence: 99%

Recycling of Palladium from Spent Catalysts Using Solvent Extraction—Some Critical Points

Paiva

2017

Metals

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Electrical and electronics equipment and automotive and industrial catalysts are some examples of top technological devices whose functioning rely on the use of platinum-group metals (PGMs). The PGMs' high economic value and difficult to replace technological properties, together with their scarcity in the Earth's crust, justify concerns about their critical condition and reinforce the importance of developing recycling practices for PGM end-of-life materials. This article presents and discusses recent advances regarding the use of hydrometallurgical solvent extraction to recover one PGM, palladium, from spent catalysts. Two different tendencies are implicit in the literature concerning Pd(II) extraction: a few groups focus on the adjustment and optimization of current commercial extractants, while others prefer to design new extracting compounds. Actually, the leach solutions obtained from the treatment of anthropogenic materials generally exhibit different compositions when compared to those coming from the primary resources. The pros and cons of both approaches are critically discussed, and the assumptions backing some of the reported achievements are also appraised.

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Section: Extractants Containing Amide Functionsmentioning

confidence: 99%

Recycling of Palladium from Spent Catalysts Using Solvent Extraction—Some Critical Points

Paiva

2017

Metals

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“…Different physiochemical methods for PGM separation from the leaching solutions are described in the literature, such as solvent extraction (Costa et al 2013;Paiva et al 2022), ion exchange (Lanaridi et al 2022), molecular recognition technology (Izatt et al 2015) and molecular ion imprinted polymer (Limjuco and Burnea 2022). However, some of those techniques may have drawbacks such as inadequate metal recovery (especially for low concentrations of metals), high energy requirements, as well as high chemical costs and environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Recovery of catalytic metals from leaching solutions of spent automotive catalytic converters using plant extracts

Nobahar

Carlier

Costa

2023

Clean Techn Environ Policy

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This study investigates the potential of hydroalcoholic extracts of Cistus ladanifer L., Erica Andevalensis and Rubus idaeus L. as a green method for the recovery of platinum group metals (PGMs) from both synthetic unimetallic solutions and multimetallic solutions obtained from the leaching of two different spent automotive catalytic converters (SACC). Experiments with unimetallic solutions revealed that E. andevalensis and R. idaeus extracts could separate about 70% of Pd and less than 40% of other tested metals (Al, Ce, Fe and Pt) from the solutions. Then, application of the plant extracts to two different SACCs leachates showed that E. andevalensis and R. idaeus extracts can induce high precipitation (> 60%) of Pd and Pt with co-precipitation of less than 20% of other metals. UV–Visible spectra analysis confirmed the bio-reduction of Pd2+ ions into Pd0 nanoparticles by R. idaeus extract, and Fourier transform infrared spectroscopy (FTIR) analysis revealed the contribution of functional groups of the phytochemicals present in the extract (such as phenols, flavonoids and anthocyanins) in the Pd2+ bio-reduction and stabilization. Afterward, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX) analysis of the precipitate obtained from one leachate with R. idaeus extract demonstrated the presence of Pd particles along with organic compounds and particles containing other metals. Therefore, particles were subjected to a washing step with acetone for further purification. Finally, scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy (STEM-EDX) analysis showed the high purity of the final Pd particles and high-resolution STEM allowed to determine their size variation of 2.5 to 17 nm with an average Feret size of 6.1 nm and confirmed their crystalline structure with an interplanar lattice distance of ~ 0.22 nm. This green approach offers various benefits including simplicity of Pd separation from the leachates as valuable nanoparticles that makes the process more feasible from economic and environmental standpoints. A process cost of ~ 20 $/g of Pd particles recovered was estimated (excluding manpower). Graphical abstract

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“…20 Monoamides are not efficient enough for PGM extraction. Thus, sulfide containing monoamides and various diamides, 21,22 including aza-or thio-bearing diamides 23,24 have been synthesized and successfully used in solvent extraction of PGM from chloride media. Malonamides proved to lead to very stable Pd(II) complexes, and to efficient extraction from nitrate media.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of palladium(II) using diamides: A performing molecular system established through a detailed study of extraction kinetics

Moussaoui

Lelias

Braibant

et al. 2021

Separation and Purification Technology

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Palladium isolation and refining through solvent extraction suffer from limited stability of commercial reagents or limited availability of robust reagents in nitrate media. Several performing extraction solvents based on diamide reagents have been proposed, but their preparation requires synthetic chemistry skills. In the present work, we propose the use of readily accessible N,N,N',N'-tetrahexylmalonamide (THMA). This reagent revealed superior distribution ratios and selectivity in comparison with previously used diamides for palladium(II) extraction from nitrate media in the frame of palladium recovery from waste. Furthermore, the benefit of excess dihexylamine (DHA) employed during the preparation of THMA was demonstrated through a gain in kinetics performance. Detailed analysis enabled to determine the best performing formulation of extraction solvent, which can be readily prepared from commercially available chemicals without any complex synthesis procedure nor purification step.

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Liquid-Liquid Extraction of Platinum from Chloride Media byN,N′-Dimethyl-N,N′-Dicyclohexyltetradecylmalonamide

Cited by 30 publications

References 28 publications

Recycling of Palladium from Spent Catalysts Using Solvent Extraction—Some Critical Points

Recycling of Palladium from Spent Catalysts Using Solvent Extraction—Some Critical Points

Recovery of catalytic metals from leaching solutions of spent automotive catalytic converters using plant extracts

Solvent extraction of palladium(II) using diamides: A performing molecular system established through a detailed study of extraction kinetics

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