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Adsorption of some anionic surfactants on barite and at solution/Air interfaces
Author(s) -
Omar A. M. A.,
Azzam E. M. S.
Publication year - 2004
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-004-0297-7
Subject(s) - chemistry , adsorption , pulmonary surfactant , hydrocarbon , gibbs isotherm , chemical engineering , inorganic chemistry , chromatography , organic chemistry , biochemistry , engineering
The adsorption behavior of synthesized anionic surfactants with the chemical structure RO‐Ph‐N=N‐Ph‐SO 3 Na, where R is an octyl, dodecyl, or cetyl group, was analyzed by using a modified version of the Frumkin adsorption isotherm. The values of thermodynamic parameters (including free energy of micellization, Δ G mic , and of adsorption, Δ G ads ) at the solution/air interface and the solid/liquid interface were calculated, and the relation between the adsorption of the surfactants at these interfaces was investigated. Studies of the surface properties of these synthetic surfactants showed that the length of the hydrocarbon chain of these surfactants plays a major role in determining their surface and thermodynamic properties and that there is a good relationship between the effectiveness of adsorption of the surfactant and its efficiency as a collector.