Study Of The Adsorption Interaction Of

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STUDY OF THE ADSORPTION INTERACTION OF

CATIONIC SURFACTANTS WITH ION EXCHANGERS

OF A DIFFERENT NATURE

A. N. Chebotaryov, T. M. Shcherbakova, T. V. Paladenko

I.I. Mechnikov Odessa State University, Department of Analytical Chemistry, Odessa, Ukraine

The study of regularities of adsorption interaction between surfactants and solid surfaces is of great interest for the analytical practice, water-purification technologies and other purposes. Directivity and universality of cationic surfactants (CS) action in reactions and processes occurring in homogeneous and heterogeneous systems are due to their ability to enter into electrostatic and hydrophobic interactions with system components.

In the work, the adsorption interaction of a CS (aethonium (AET) or cetyl pyridinium chloride (CPCl)), which concentration was within the range of 1×10-5 to 1×10-6 mol/l, with strongly acid KU-2-8 cation exchanger, strongly basic AV-17 anion exchanger as well as L 5/40 silica gel – a weak-acid cation exchanger – was investigated. Dependencies of the AET and CPCl extraction degree on pH, the phase contact time and the sorbent weight were studied. The sorption of CPCl and AET has been found to attain its maximum: for KU-2-8 (>90%) - at pH 2, for L 5/40 silica gel (>90%) and AV-17 anion exchanger (~45%) – at pH 4.

The analysis of the sorption isotherm shapes permitted to suggest a possible sorption mechanism for different ion exchangers. For strongly acid KU-2-8, the isotherm has two plateaus. The first non-extended one is characteristic of a monolayer formation and the second extended one which initial point corresponds to the CMC value is evidence of a multilayer formation. Such a picture is not observed for L 5/40 silica gel. It is due to its weak-acid nature and a low negative-charge density of its surface.



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