Enhancement of the Adsorption Selectivity of Nanoporous

Clinoptilolite by Hydrophobization with Organosiloxanes

L. I. Bel’chinskaya*, O. Yu. Strel’nikova*, L. A. Novikova*,

F. Ressner***, and O. V. Voishcheva**

* Voronezh State Academy of Forestry Engineering, Voronezh, Russia

** Voronezh State Agrarian University, Voronezh, Russia

*** Carl von Ossietzky Universityat, Oldenburg, Germany

Received June 13, 2007

Abstract — The adsorptivity of natural nanoporous clinoptilolite modified with polymethyl- and polyethylsi-loxanes was studied. The surface of modified clinoptilolite is less hydrophilic, which lowers the selective adsorption of water from a mixture with toluene. The specific surface area and porosity of natural clinoptilolite were determined. The IR spectra of natural and modified clinoptilolites were recorded. Hydrophobization of the natural zeolite surface with organosiloxanes made it more adsorption-selective to formaldehyde. Polyethyl-siloxane was found to be a better surface modifier than polymethylsiloxane.

PACS numbers: 68.43.-h