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.

Metadata

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:

Accepted: 10 November 2017
Published (online): 20 December 2017
Published: 3 July 2018

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:

https://doi.org/10.1080/01496395.2017.1405034

Related URLs:

Author

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