Adsorption and Gas-Chromatographic Properties of Silicas Modified with Silver
Nanoparticles of Ago and Ag(I) are immobilized on a surface of macroporous silica and aminosilica. Adsorption kinetics of the basic dye - methylene blue (MB) from water solutions and adsorption isotherms of alkyne - phenylacetylene from octane solutions on initial and modified by silver silica are measured. Dependence of limited adsorption and constants of speed on immobilization conditions and silver reduction is considered. The greatest adsorption of phenylacetylene on Ag(I) silica is observed. By a method of a gas chromatography it is shown, that the same silica, modified with unreduced silver possesses high selectivity concerning olefin hydrocarbons. Reduction of silver and its complexation with aminopropyl grupes of aminosilica lead to considerable decrease in selectivity of the composite sorbents.