A1 Refereed original research article in a scientific journal
Selective separation of Am(iii)/Eu(iii) using heterocyclic bistriazolyl phosphonate grafted zirconia and titania solid phase extractants
Authors: Hiltunen O.-M.; Suominen T.; Aho J.; Otaki M.; Zupanc A.; Hietala S.; Silvennoinen G.; Koivula R.
Publisher: Royal Society of Chemistry (RSC)
Publication year: 2025
Volume: 2
Issue: 1
First page : 279-291
Last page: 291
eISSN: 2755-3701
DOI: https://doi.org/10.1039/d4lf00277f
Web address : https://doi.org/10.1039/d4lf00277f
Abstract
Surface functionalization of metal oxides with phosphonic acid monolayers by covalent bonding enables the generation of robust hybrid materials with enhanced separation properties. Mesoporous crystalline zirconia and titania serve as applicable inorganic supports with high thermal stability and resistance to oxidation, acidity and radiolysis. We have fabricated selective solid phase extractants that efficiently separate americium and europium from each other, via straightforward grafting of the zirconia and titania surfaces with N- and S-donor complexing agents, namely 2,6-bis-triazolyl-pyridine derivatives. Separation factors (Am/Eu) up to 13 were obtained in binary solution at pH 2 and preference for Am over Eu was observed even in Eu excess solution. These stable hybrid materials can be utilized for separation purposes without substantial degradation, providing advantageous reusability and a greener option in comparison to commonly used solvent extraction methods.
Surface functionalization of metal oxides with phosphonic acid monolayers by covalent bonding enables the generation of robust hybrid materials with enhanced separation properties. Mesoporous crystalline zirconia and titania serve as applicable inorganic supports with high thermal stability and resistance to oxidation, acidity and radiolysis. We have fabricated selective solid phase extractants that efficiently separate americium and europium from each other, via straightforward grafting of the zirconia and titania surfaces with N- and S-donor complexing agents, namely 2,6-bis-triazolyl-pyridine derivatives. Separation factors (Am/Eu) up to 13 were obtained in binary solution at pH 2 and preference for Am over Eu was observed even in Eu excess solution. These stable hybrid materials can be utilized for separation purposes without substantial degradation, providing advantageous reusability and a greener option in comparison to commonly used solvent extraction methods.
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