Cobalt and nickel uptake by silica-based extractants

Pepper, S. E., Whittle, K. R., Harwood, L. M. ORCID: https://orcid.org/0000-0002-8442-7380, Cowell, J., Lee, T. S. and Ogden, M. D. (2018) Cobalt and nickel uptake by silica-based extractants. Separation Science and Technology, 53 (10). pp. 1552-1562. ISSN 0149-6395 doi: 10.1080/01496395.2017.1405034

Abstract/Summary

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
URI	https://reading-clone.eprints-hosting.org/id/eprint/74598
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	Filtration and Separation, Process Chemistry and Technology, General Chemistry, General Chemical Engineering
Publisher	Taylor & Francis
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