Abstract

ABSTRACT Titanium antimonate (TiSbA) cation exchanger, prepared under different molar ratios of titanium and antimony, has been characterized by X-ray diffraction, thermal analysis, infrared spectra, and pH-titration. The pH-titration curves showed apparently monobasic acid type. The uptakes of alkali metal ions increased with increasing pH of the solution and with decreasing the molar ratio (Ti/Sb) in the exchanger. An unusual selectivity sequence of the order Na < K < Rb < Cs was found for microamounts of alkali metal ions on TiSbA, while the regular selectivity sequence Mg < Sr < Ba was found for alkaline earth metal ions in nitric acid media. The maximum separation factors, ∝Li Na(=55) and ∝(=186) were found on the TiSbA with Ti/Sb molar ratio of 1.56, respectively. The effective separations of Li from Na and K, Mg from Ca and Sr have been achieved by using a relatively small column (2 cm × 0.5 cm i.d. ) containing TiSbA of Ti/Sb ratio 1.56.

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