ION-EXCHANGE PROPERTIES OF SILICA-TITANIA MIXED-OXIDE GEL FOR AMMONIA IN AQUEOUS SOLUTIONS
Proton-form silica-titania gel of mole ratio 1:1 exhibited high ion-exchange abilities for ammonia in aqueous solutions. Its apparent capacity increased with increasing pH of solution tested, which attained above 4 mmol g−1 at pH 9. Separation of ammonia and sodium in aqueous solution loaded in advance on the silica-titania gel was complete when used hydrochloric acid as an eluent.