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G. R. Ramazanova, T. I. Tikhomirova, V. V. Apyari
Sorption of food dyes on polyurethane foam
and aluminum oxide
Abstract
Sorption of food dyes Sunset Yellow
(E-110), Tartrazine (E 102), Ponceau 4R (E-124), Fast green FCF (E 143) on poly
ethers based polyurethane foam and α-Al2O3
from water solutions was studied. It was found that the maximum sorption was
attained in the range of 0.2 M HCl-pH 2 on polyurethane foam and at pH 2-4 on
aluminum oxide. In the optimal conditions, the recoveries on polyurethane foam
and α-Al2O3 were 20-30% and
70-80%, respectively. Using diffuse reflectance spectroscopy it was shown that
when extracting all dyes, with the exception of Fast green FCF, on the sorbents
in the range of 0.5 M HCl - pH 8.0 only one form of the dye extracted is which
dominates under these conditions in the aqueous solution. Possible models of
interaction of the dyes with surface of the sorbents were proposed.
Key words: food dyes, Sunset Yellow, Sunset
Yellow, Ponceau 4R, Fast green FCF, polyurethane foam, aluminum oxide, diffuse
reflectance spectroscopy, sorption.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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