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Adsorption of reactive dyes by modified chitin from aqueous solutions

100%

Filipkowska U., Klimiuk E., Grabowski S., Siedlecka E.

Polish Journal of Environmental Studies

2002

tom 11

nr 4

The adsorption of reactive dyes onto chitin (deacetylation degree = 5%) was investigated from aqueous solutions at pH 3. Ten reactive dyes were examined, including 5 dyes from the helactine group, 3 dyes from the polactine group and 2 dyes from the remazol group. The K and b constants were calculated from the Langmuir equation that assumes the presence of two sites of different nature. It was found that the dye adsorption on chitin in type I and II sites differed in both the adsorption affinity and maximum adsorption capacity. Based on the dimensionless separation factor RL it was found that the dye adsorption mechanism in type I sites was an ion exchange, whereas in the case of type II sites it was a physical adsorption. A correlation was found between dye adsorption on chitin and the number of sulfone groups in a dye molecule. However, neither molecular weight nor the number of aromatic rings was correlated with dye adsorption.

Ograniczanie wyników

1 Polish Journal of Environmental Studies

1 Filipkowska U.

1 Grabowski S.

1 Klimiuk E.

1 Siedlecka E.

1 2002

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Adsorption of reactive dyes by modified chitin from aqueous solutions