Cobalt and nickel uptake by silica-based extractants



Pepper, Sarah E, Whittle, Karl R ORCID: 0000-0002-8000-0857, Harwood, Laurence M, Cowell, Joseph, Lee, Taek Seung and Ogden, Mark D
(2018) Cobalt and nickel uptake by silica-based extractants. SEPARATION SCIENCE AND TECHNOLOGY, 53 (10). pp. 1552-1562.

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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.

Item Type: Article
Uncontrolled Keywords: Ion exchange, silica-based resin, Purolite S950, cobalt, nickel
Depositing User: Symplectic Admin
Date Deposited: 11 Jan 2018 08:41
Last Modified: 19 Jan 2023 06:46
DOI: 10.1080/01496395.2017.1405034
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3015838