The effect of solvent nature on the adsorption interaction between cinnamic acid and silicon dioxide

It is established that the adsorbability of cinnamic acid from solutions on the surface of highly dispersed silica decreases with an increase in the polarity and electron-donor ability of a solvent. The adsorption process is considerably affected by the hydrophobization of the surface. The adsorption curve passes through a maximum when methyl groups are substituted for 40–55% of the total number of hydroxyls on the silica surface. Probable structures of adsorption complexes are suggested.