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https://hdl.handle.net/10316/5217
Título: | The characterisation by luminescence spectroscopy of uranium(VI) incorporated into zeolites and aluminas | Autor: | Azenha, M. E. D. G. Miguel, Maria da Graça Formosinho, S. J. Burrows, H. D. |
Palavras-chave: | Uranyl ion; Aluminas; Zeolites; Adsorption; Luminescence spectroscopy | Data: | 2001 | Citação: | Journal of Molecular Structure. 563-564:(2001) 439-442 | Resumo: | Luminescence spectroscopy of solids at 77 K has been used to characterise the uranium(VI) species incorporated into [alpha]-alumina, [gamma]-alumina and zeolites Y and ZSM-20 by adsorption from solution and into ZSM-5 by chemical synthesis. With uranyl adsorbed from nitrate solutions onto [alpha]- and [gamma]-aluminas, the luminescence measurements show the dominant uranium species is schoepite, UO3·xH2O, in agreement with results from X-ray diffraction and Raman spectroscopy. With uranyl acetate, there are indications that a crystalline acetate species is also present. With zeolite-Y and ZSM-20, the main species is a dimer. In addition, some monomeric [UO2(H2O)5]2+ is also present. With ZSM-5, although this is not observed in X-ray diffraction, the luminescence spectrum shows the presence of a species, similar to the schoepite seen with the aluminas. It is suggested that this may be due both to closely related polymeric species, and to uranyl anions, such as [UO2(OH)4]2- and [UO2(OH)3]-. | URI: | https://hdl.handle.net/10316/5217 | DOI: | 10.1016/S0022-2860(00)00829-2 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Química - Artigos em Revistas Internacionais |
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filef74b2b44d29d4b76adfecf8c3d9b8946.pdf | 87.63 kB | Adobe PDF | Ver/Abrir |
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