Publications
13 results found
Tasker PA, Doidge ED, 2021, The coordination chemistry of extractive metallurgy, Comprehensive Coordination Chemistry III, Pages: 494-557, ISBN: 9780081026892
Extractive metallurgy encompasses a very wide range of chemical and physical processes, some of which were first employed thousands of years ago.1,2 Most of this technology was developed to recover metals from primary sources (metal ores), but increasingly effort is being directed at recovery of metals from secondary sources (“urban mining”).3 The choice of separation technology to generate metals in high purity is very dependent on the nature of the source and particularly on the extent to which the desired metal is diluted in the source. As for many other materials, selling prices usually correlate with their degree of dilution in the matrix from which they are extracted (see the Sherwood plot (A), Fig. 1).4,5 More recently Sherwood plots7 have been generated for the recovery of metals from various waste materials.6 From these it appears that urban mining is most commercially viable for the recovery of precious and platinum group metals from printed circuit boards, mobile phones, and personal computers. The viability of metal recovery is much greater from components of manufactured products or devices. This is demonstrated by comparing the Sherwood plots (B) and (C) in Fig. 1 for metal recovery from whole automobiles and automobile parts, providing a strong argument for designing products for ease of disassembly.6 In principle, similar technologies can be used for metal-recovery from primary sources (ores) or secondary sources (wastes). Extraction of a desired metal requires separation based on some form of phase transfer. In practice in extractive metallurgy the options are liquid-liquid distribution....
Carrick AI, Doidge ED, Bouch A, et al., 2021, Cover Feature: Simple Amides and Amines for the Synergistic Recovery of Rhodium from Hydrochloric Acid by Solvent Extraction (Chem. Eur. J. 34/2021), Chemistry – A European Journal, Vol: 27, Pages: 8601-8601, ISSN: 0947-6539
Carrick AI, Doidge ED, Bouch A, et al., 2021, Simple amides and amines for the synergistic recovery of rhodium from hydrochloric acid by solvent extraction, Chemistry – A European Journal, Vol: 27, Pages: 8714-8722, ISSN: 0947-6539
The separation and isolation of many of the platinum group metals (PGMs) is currently achieved commercially using solvent extraction processes. The extraction of rhodium is problematic however, as a variety of complexes of the form [RhCln(H2O)6-n](n−3)− are found in hydrochloric acid, making it difficult to design a reagent that can extract all the rhodium. In this work, the synergistic combination of a primary amine (2-ethylhexylamine, LA) with a primary amide (3,5,5-trimethylhexanamide, L1) is shown to extract over 85 % of rhodium from 4 M hydrochloric acid. Two rhodium complexes are shown to reside in the organic phase, the ion-pair [HLA]3[RhCl6] and the amide complex [HLA]2[RhCl5(L1)]; in the latter complex, the amide is tautomerized to its enol form and coordinated to the rhodium centre through the nitrogen atom. This insight highlights the need for ligands that target specific metal complexes in the aqueous phase and provides an efficient synergistic solution for the solvent extraction of rhodium.
Doidge ED, Kinsman LMM, Ji Y, et al., 2019, Evaluation of Simple Amides in the Selective Recovery of Gold from Secondary Sources by Solvent Extraction, ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol: 7, Pages: 15019-15029, ISSN: 2168-0485
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- Citations: 25
Roebuck JW, Bailey PJ, Doidge ED, et al., 2018, Strong and Selective Ni(II) Extractants Based on Synergistic Mixtures of Sulfonic Acids and Bidentate N-Heterocycles, SOLVENT EXTRACTION AND ION EXCHANGE, Vol: 36, Pages: 437-458, ISSN: 0736-6299
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- Citations: 3
Seery MK, Agustian HY, Doidge ED, et al., 2017, Developing laboratory skills by incorporating peer-review and digital badges, CHEMISTRY EDUCATION RESEARCH AND PRACTICE, Vol: 18, Pages: 403-419, ISSN: 1109-4028
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- Citations: 48
Carson I, Healy MR, Doidge ED, et al., 2017, Metal-binding motifs of alkyl and aryl phosphinates; versatile mono and polynucleating ligands, COORDINATION CHEMISTRY REVIEWS, Vol: 335, Pages: 150-171, ISSN: 0010-8545
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- Citations: 23
Doidge ED, Carson I, Love JB, et al., 2016, The Influence of the Hofmeister Bias and the Stability and Speciation of Chloridolanthanates on Their Extraction from Chloride Media, SOLVENT EXTRACTION AND ION EXCHANGE, Vol: 34, Pages: 579-593, ISSN: 0736-6299
Doidge ED, Carson I, Tasker PA, et al., 2016, A Simple Primary Amide for the Selective Recovery of Gold from Secondary Resources, Angewandte Chemie, Vol: 128, Pages: 12624-12627, ISSN: 0044-8249
Doidge ED, Carson I, Tasker PA, et al., 2016, A Simple Primary Amide for the Selective Recovery of Gold from Secondary Resources, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 55, Pages: 12436-12439, ISSN: 1433-7851
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- Citations: 86
Healy MR, Roebuck JW, Doidge ED, et al., 2016, Contributions of inner and outer coordination sphere bonding in determining the strength of substituted phenolic pyrazoles as copper extractants, DALTON TRANSACTIONS, Vol: 45, Pages: 3055-3062, ISSN: 1477-9226
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- Citations: 8
Carson I, MacRuary KJ, Doidge ED, et al., 2015, Anion Receptor Design: Exploiting Outer-Sphere Coordination Chemistry To Obtain High Selectivity for Chloridometalates over Chloride, INORGANIC CHEMISTRY, Vol: 54, Pages: 8685-8692, ISSN: 0020-1669
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- Citations: 23
Doidge ED, Roebuck JW, Healy MR, et al., 2015, Phenolic pyrazoles: Versatile polynucleating ligands, COORDINATION CHEMISTRY REVIEWS, Vol: 288, Pages: 98-117, ISSN: 0010-8545
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- Citations: 21
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