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Raman spectra of zeolites exchanged with uranyl(VI) cations-II. Zeolite X
Journal article   Peer reviewed

Raman spectra of zeolites exchanged with uranyl(VI) cations-II. Zeolite X

John R Bartlett and R P Cooney
Spectrochimica Acta Part A: Molecular Spectroscopy, Vol.45(5), pp.549-555
1989
url
https://doi.org/10.1016/0584-8539(89)80005-4View
Published Version

Abstract

Analytical Chemistry Physical Chemistry (incl. Structural) Macromolecular and Materials Chemistry
The formation of hydrolysed uranyl(VI) species in UO2X zeolites prepared by various methods has been investigated by Raman spectroscopy. Ion-exchange in aqueous (pH>3) and non-aqueous (anhydrous methanol and uranyl nitrate melts) media resulted in the formation of hydroxy-bridged complexes such as [(UO2)3(OH)4]2+, [(UO2)3(OH)5]+, and [(UO2)4(OH)7]+. Ion-exchange in more acidic media (initial pH < 3) was accompanied by the formation of a disordered phase incorporating UO3, following extensive collapse of the zeolite framework structure. Cation speciation in the UO2X system is compared to that in UO2Y zeolites.

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