Adsorption of organic cations on silica gel from aqueous solutions

The individual and coadsorption of the methylene blue dye and catamine AB s urfactant are investigated. The energies of specific adsorption of the cati ons of catamine and methylene blue on the silica gel surface (-10kT and -(1 5 +/- 1) kT, respectively), as well as of their surface aggregation (-12kT and -15kT, respectively), are determined. It is concluded that the specific adsorption of organic cations is due to the simultaneous formation of seve ral hydrogen bonds. A new method is proposed to determine the adsorption pa rameters of ions and surfactant micelles based on the model of the coadsorp tion of two substances.