Solvent extraction separation of uranium (VI) with p-t-butyl calix[8]arene and octaacetatecalix[8]arene and beta-diketone (HTTA)
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2001
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RARE EARTHS'2001
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Macrocyclic calixarenes are among the recent extractants introduced to offer a differeni concqx on extraction
selectivity based on a correspondence bctween the cavity size of calixarene and the extracted metal cation_ On the other
harx1 the selective extraction of uranium has attracted extensive attention from rhernieS because of its importance m
relation to energy problems and environment. We have studied a new method for the solvent extraction separation of
the UO22+ion by two calbcPtiarenes from acetate solution. Octaacetatecalix[8]arerie bearing acetate group on the lower
him have been synthesized and the extractability (%E) and selectivity towards uranyl ion (UO 22+ ) was estimated in a
two phase (acetate-toluene) solvent extraction system. %E for these calixarenes/HTTA systems increases from 4
and saturation is reached at around pH 6-7 were more than 90% of extractability was obtained. The solvent extraction of
UO22+ with these calixarenes and thenoyltrifluoroacetone (HTTA) in toluene lias bem studied in the presence or
absence of alkali ions (Na+, ir). The efficiency of extraction increases drastically in the presence of alkili ions, due to
the formation of heteronuclear cornplexes. Synergistic extraction was observed with calixarenes and
thenoyltrifluoroacetone (HTTA). We also found that the selectivity of acetatecalix[8]arene /bua is superior to p-tcrc
butylcalix[Marendlrtta. Absorption spectra show shifts of characteristics bands of calixarene from ultraviolet region to
visible region with gap of 100 nm when HTTA is introduced in the solution.
Como referenciar
FELINTO, M.C.F.C.; ALMEIDA, V.F. Solvent extraction separation of uranium (VI) with p-t-butyl calix[8]arene and octaacetatecalix[8]arene and beta-diketone (HTTA). In: RARE EARTHS'2001, Sept. 22-26, 2001, Campos do Jordao, SP. Abstracts... p. 154. Disponível em: http://repositorio.ipen.br/handle/123456789/21116. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.