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The water soluble material, 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanechloride silsesquioxane (dabcosil silsesquioxane) was obtained. The dabcosil silsesquioxane was grafted onto a silica surface, previously modified with aluminum oxide. The resulting solid, dabcosil-Al/SiO 2 , pres- ents 0.15 mmol of dabco groups per gram of material. The product of the grafting reaction was ana- lyzed by infrared spectroscopy and N 2 adsorption-desorption isotherms. The dabcosil-Al/SiO 2 materi- al was used as sorbent for chromium (VI) adsorption in aqueous solution.