THE EFFECT OF THE SURFACE HYDROPHOBICITY ON SELECTIVE 1-BUTANOL ADSORPTION FROM WATER

The sorption of l-butanol from water was investigated on porous and pl ane hydrophilic and hydrophobic adsorbents. Adsorption, X-ray diffract ion and calorimetric measurements were carried out throughout the aque ous phase, up to; the solubility limit of l-butanol in water. Determin ing the adsorption excess isotherms we have observed that the excess a mounts of 1-butanol were positive for nonpolar activated carbon and gr aphitized black, for K60 silica and fully hydrophobised montmorillonit e layers in the entire composition range. For Aerosil-200 and partiall y modified montmorillonite layers the adsorption process presents a ne w-type isotherm. The sorption properties of 1-butanol depend on the hy drophilic/hydrophobic ratio of the surface. Interlayer composition vs, bulk composition diagrams were constructed from a combination of adso rption and X-ray diffraction data only for montmorillonite organocompl exes.