A procedure to immobilize quaternary ammonium salts in solid silica supports is described. The process is based on the doping of sol-gel glasses by organic anion-exchange compounds during the polymerization of the glasses. Sol-gel glasses doped with Aliquat 336, cetyltrimethylammonium bromide, or cetylpyridinium bromide may serve as solid anion exchangers, exhibiting selectivity properties similar to strong base ion exchangers. This process provides a simple method for the preparation of silica-based ion exchangers.
Bibliographical noteFunding Information:
The development of applications of doped glasses is currently supported by the National Council for Research and Development, Israel, and KFK, Karlsruhe, Germany, by the Ministry of Industry and Commerce, by the Szold Foundation, by the Krupp foundation, and by the Materials Division of the US Army (UK).