Synthesis and ion-exchange properties of silica chemically modified with aminophosphonic acid

Abstract The synthesis of a cation exchanger by conversion of 3-aminopropyl moieties covalently attached to a silica surface to propylaminomethylphosphonic by reaction with sodium hypophosphite and formaldehyde is described. The ion-exchange properties of the prepared sorbent in the pH range from 2.5 to 7.0 were evaluated by investigation of the retention of different ionogenic organic molecules. The ion-exchange selectivity toward alkali and alkaline-earth and transition metals ions was estimated. The effects of concentration of the nitric or perchloric acid, ionic strength and column temperature on the retention of cations were studied. The possibility of ion-chromatographic separation of a standard mixture of seven alkaline-earth and transition metal ions on a short (50×4.6 mm) column packed with 10 μm aminophosphonic-bonded silica using mineral acid solutions as eluents was demonstrated.

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