Cobalt and nickel uptake by silica-based extractants

Abstract

The pKas of ethyl/butyl phosphonate silica (EBP-Si) have been determined, and the removal of cobalt and nickel from solution was investigated as a function of various parameters and compared with those of Purolite S950. pH uptake experiments suggested a combination of ion exchange and acid dissociation of the surface occurring. Isotherm data, fitted using the Langmuir and Dubinin–Radushkevich (D-R) models, indicated that stronger complexes formed with S950 than with EBP-Si. Kinetic data, fitted using a pseudo-second-order model, suggested that the rate-determining process is the reaction of metal ions with the chelating functionality of the resin. Uptake by EBP-Si is two to three times faster than that on S950.

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Item Type:	Article
Authors/Creators:	Pepper, S.E. Whitte, K.R. Harwood, L.M. Cowell, J. Seung Lee, T. Ogden, M.D. https://orcid.org/0000-0002-1056-5799
Copyright, Publisher and Additional Information:	© 2018 Taylor & Francis. This is an author-produced version of a paper subsequently published in Separation Science and Technology. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	Ion exchange; silica-based resin; Purolite S950; cobalt; nickel
Dates:	Published: 3 July 2018 Published (online): 20 December 2017 Accepted: 10 November 2017
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield)
Funding Information:	Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/M026558/1
Depositing User:	Symplectic Sheffield
Date Deposited:	12 Jan 2018 11:31
Last Modified:	11 Aug 2020 16:00
Status:	Published
Publisher:	Taylor & Francis
Refereed:	Yes
Identification Number:	10.1080/01496395.2017.1405034
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:126089

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Cobalt and nickel uptake by silica-based extractants

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