Título: | USE OF POLYURETHANE FOAM ON INDIUM EXTRACTION FROM IODIDE MEDIUM | ||||||||||||||||||||||||||||||||||||
Autor: |
ELIZABETH DE MAGALHAES MASSENA FERREIRA |
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Colaborador(es): |
ISABEL MARIA NETO DA SILVA MOREIRA - Orientador |
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Catalogação: | 13/ABR/2004 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=4774&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=4774&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.4774 | ||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||
This work shows a systematic study on indium iodide
sorption using commercial polyether-based polyurethane foam
as a solid phase extractor in order to preconcentrate and/
or separate indium from different sample matrices. The
physico-chemical characteristics of the system sorption
were investigated for the batch process. The system has
shown rapid kinetic and maximum sorption from a meaningful
range of either acid or basic medium and achieves
distribution ratios above 104 L kg-1 ([KI] maior ou igual
0.6 mol L-1).
Sorption equilibrium analysis indicates the tetraiodo-
indate (MInI4) as the main species sorbed on the foam
matrix; the more probable mechanisms of sorption were
discussed. Langmuir isotherm was successfully fitted and a
value of (1.55 mais ou menos 0.02)x10-1 mol kg-1 was
obtained for the
saturation capacity. The temperature effect was evaluated
and indicates a spontaneous and exothermic chemisorption
process favored at low temperatures. The indium
reextraction from the foam using a HCl 0.1 mol L-1 in
ethanol 50% medium solution has also shown a rapid kinetic
(10 minutes) and efficiency (97%). The system should be
used to separate large quantities of Al, Fe, Zn, Ni, Co, Mn
and Ga from trace indium. Cd and Pb are coextracted with
indium. Citric acid, F- and EDTA interfere on indium
sorption; sodium thiosulfate (menor ou igual 0.1 mol L-1)
and ascorbic
acid (up to 0.1 mol L-1) do not interfere. The system was
evaluated in the determination of indium in the presence of
105 times Zn, Al and Fe by indium addition and recovery
technique. The elements determination by ICP-OES showed
separation factors around 7.0x102 for Zn/In, 1.0X105 for
Fe/In and of 5.5x104 for Al/In, with an efficient recovery
of indium. The developed methodology was applied to
determine indium in metallic zinc standard reference
material (NIST) by ICP-OES and has shown compatible
agreement with the certified value at a 95% confidence
level.
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