Abstract
A novel procedure for the preparation of low-surface-area porous silica adsorbents, modified by cadmium salts, is described. The salt is introduced concurrently with a reduction of the surface area of an inexpensive silica gel by hydrothermal treatment. The resulting materials contain mg/g amounts of the metal. Liquid chromatography on the cadmium-modified adsorbent is shown. Charge-transfer chromatography is favored when the salt is introduced at high hydrothermal temperature which yields ultra low surface area and dense cadmium population.
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