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T. D. Khokhlova, Ye. V. Vlasenko, D. N. Khryashchikova, S. N. Lanin, V. V. Smirnov
Adsorption and gas-chromatographic properties of silicas, modified with silver
Abstract
Nanoparticlesof 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 aminopropylgrupes of aminosilica lead
to considerable decrease in selectivity of the composite sorbents.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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