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Adsorption of Cationic Dyes by Acrylic Films I—Sorption Isotherms

1972; Wiley; Volume: 88; Issue: 6 Linguagem: Inglês

10.1111/j.1478-4408.1972.tb03083.x

2056-5267

Richard J. Harwood, R. McGregor, Robert Peters,

Analytical Chemistry and Chromatography

Sorption isotherms have been determined for five basic dyes on films prepared from an acrylic polymer. The results can be explained by an ion‐exchange mechanism over 80% of the concentration range, or by a simple ion‐distribution mechanism over the whole of the range. Addition of sodium ions reduces the dye uptake in accordance with the suggested mechanism. Isotherms of a dye mixture have shown that competition occurs, and the ‘ion selectivity’ constants calculated from these results agree well with those derived using the dyes singly.