Surface Properties of Coal Fines in Water. II. Isotherms, Electrokinetics and Chainlength Dependence for Cationic Surfactant Adsorption
- 1 March 1985
- journal article
- research article
- Published by Taylor & Francis in Coal Preparation
- Vol. 2 (1) , 1-17
- https://doi.org/10.1080/07349348508905149
Abstract
The adsorption of the cationic surfactants, dodecylpyridinium chloride, tetradecyl-pyridinium bromide and hexadecylpyridinium bromide on run of mine coal at varying pH's has been studied. The effect of these surfactants on the zeta potential as a function of pH was determined. Surfactant adsorption increases in the order C16 > C14 > C12, and generally increases with increasing pH, especially for the longer chainlengths. Microelectrophoretic zeta potential measurements clearly show the effect of surfactant adsorption, and when pH > iep, i.e. when the coal is negatively charged, charge reversal of the coal surface occurs in all cases. It is concluded that adsorption of cationic surfactants involves both electrostatic (headgroup) and hydro-phobic (alkyl chain) interactions with the coal surface.Keywords
This publication has 1 reference indexed in Scilit:
- Binding of Alkylpyridinium Cations by Anionic PolysaccharidesPublished by American Chemical Society (ACS) ,1984