Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 53, Issue 10, Pages 1552-1562Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2017.1405034
Keywords
Ion exchange; silica-based resin; Purolite S950; cobalt; nickel
Funding
- Engineering and Physical Sciences Research Council through the UK Korea Civil Nuclear Energy program [EP/M026558/1]
- Engineering and Physical Sciences Research Council [EP/M026558/1, EP/M026396/1] Funding Source: researchfish
- EPSRC [EP/M026396/1, EP/M026558/1] Funding Source: UKRI
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The pK(a)s 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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