Imperial College London

Dr Euan D Doidge

Faculty of Natural SciencesDepartment of Chemistry

Principal Teaching Fellow
 
 
 
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Contact

 

+44 (0)20 7594 8173e.doidge Website

 
 
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Location

 

241ChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
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14 results found

Billard I, Chagnes A, Doidge E, Love JB, Regel-Rosocka Met al., 2023, Introduction to the RSC Advances themed collection on metal extraction and recycling., RSC Adv, Vol: 13

Professor Isabelle Billard, Professor Alexandre Chagnes, Dr Euan Doidge, Professor Jason Love and Professor Magdalena Regel-Rosocka, introduce this RSC Advances themed collection on metal extraction and recycling.

Journal article

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....

Book chapter

Carrick AI, Doidge ED, Bouch A, Nichol GS, Patrick J, Schofield ER, Morrison CA, Love JBet 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

Journal article

Carrick AI, Doidge ED, Bouch A, Nichol GS, Patrick J, Schofield ER, Morrison CA, Love JBet 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.

Journal article

Doidge ED, Kinsman LMM, Ji Y, Carson I, Duffy AJ, Kordas IA, Shao E, Tasker PA, Ngwenya BT, Morrison CA, Love JBet 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

Journal article

Roebuck JW, Bailey PJ, Doidge ED, Fischmann AJ, Healy MR, Nichol GS, O'Toole N, Pelser M, Sassi T, Sole KC, Tasker PAet 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

Journal article

Seery MK, Agustian HY, Doidge ED, Kucharski MM, O'Connor HM, Price Aet 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

Journal article

Carson I, Healy MR, Doidge ED, Love JB, Morrison CA, Tasker PAet 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

Journal article

Doidge ED, Carson I, Love JB, Morrison CA, Tasker PAet 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

Journal article

Doidge ED, Carson I, Tasker PA, Ellis RJ, Morrison CA, Love JBet 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

<jats:title>Abstract</jats:title><jats:p>Waste electrical and electronic equipment (WEEE) such as mobile phones contains a plethora of metals of which gold is by far the most valuable. Herein a simple primary amide is described that achieves the selective separation of gold from a mixture of metals typically found in mobile phones by extraction into toluene from an aqueous HCl solution; unlike current processes, reverse phase transfer is achieved simply using water. Phase transfer occurs by dynamic assembly of protonated and neutral amides with [AuCl<jats:sub>4</jats:sub>]<jats:sup>−</jats:sup> ions through hydrogen bonding in the organic phase, as shown by EXAFS, mass spectrometry measurements, and computational calculations, and supported by distribution coefficient analysis. The fundamental chemical understanding gained herein should be integral to the development of metal‐recovery processes, in particular through the use of dynamic assembly processes to build complexity from simplicity.</jats:p>

Journal article

Doidge ED, Carson I, Tasker PA, Ellis RJ, Morrison CA, Love JBet 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

Journal article

Healy MR, Roebuck JW, Doidge ED, Emeleus LC, Bailey PJ, Campbell J, Fischmann AJ, Love JB, Morrison CA, Sassi T, White DJ, Tasker PAet 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

Journal article

Carson I, MacRuary KJ, Doidge ED, Ellis RJ, Grant RA, Gordon RJ, Love JB, Morrison CA, Nichol GS, Tasker PA, Wilson AMet 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

Journal article

Doidge ED, Roebuck JW, Healy MR, Tasker PAet al., 2015, Phenolic pyrazoles: Versatile polynucleating ligands, COORDINATION CHEMISTRY REVIEWS, Vol: 288, Pages: 98-117, ISSN: 0010-8545

Journal article

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