Absorcao de haletos metalicos em silica funcionalizada com grupos 3-propilimidazol : estudo dos sistema e aplicacao em preconcentracao de metais

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

Silica gel surface modified with imidazolylpropil group was used to absorb MX2(M=Mn, Ni, Cu, Zn and Cd; X= Cl, Br and I) and FeCl3 from ethanol and acetone solution. The adsorption capacity and the intensity of the absorption were determined by using Langmuir equation. The influences of the solvent, temperature and degree of functionalization on the adsorption were also studied. The infrared spectra of the functionalized silica were recorded between 1700-1300cm. The bands of the imidazole skeletal vibrations are shifted to brighter frequences upon metal to base nitrogen interaction. Informations from EPR spectroscopy permitted to assign a local symmetry of CuCl2 imidazolylpropil surface complex. The preconcentration experiments were developed using glass chromatographic column technique. The adsorption experiments were carried out employing individuals metals ions and mixtures of these from alcoholic solutions. The method was also used in preconcentration of several metals cations found in hidracted fuel alcohol. The analysis of metals ions present in mixtures were made through atomic absorption spectrometry.

ASSUNTO(S)

absorção silica

ACESSO AO ARTIGO

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