Preparation and Characterization of Nanosized Barium-strontium Titanate Immobilized on Aluminum oxide and Its Application in Adsorption

摘要

Nanometer barium-stroutium titanate immobilized on aluminum oxide (ABST) was prepared by the citric acid sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its Pb2+ and Cd2+ adsorption properties from water were studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer barium-strontium titanate was immobilized on aluminum oxide firmly, becoming a composite adsorbent. The lead and cadmium ions were quantitatively retained at pH 5-8; their adsorption capacities of ABST were 70.28 mg g-1 and 8.12 mg g-1, respectively. The adsorbent of adsorped lead and cadmium ions were regenerated completely by elution with 1 mol-L-1 HNO3. The adsorbent had a promising prospect in analyticl chemistry and water treatment.