Abstract
Abstract A comprehensive study of the preparation of hydrous niobium(V) oxide ion exchangers was made using three kinds of niobium solutions: (1) HCl, (2) C2H5OH, and (3) H2SO4. From a detailed examination of the dependency of the yield, the ion-exchange behavior toward Na+, the chemical stability, and some other properties, regarding the method for precipitation, it was found that the pyrohydrolysis of the NbCl5 solution was the best method, since the procedure was simple, rapid and reproducible, and the product had a comparatively good ion-exchange property. The product obtained from the H2SO4 solution had the largest ion-exchange capacity and was most stable in highly alkaline solutions, but the whole procedure was very tedious. The exchanger prepared from the ethanolic solution had a smaller ion-exchange capacity in a pH region higher than 8. The materials, thus obtained, had at least two kinds of weakly dissociable ion-exchange sites, and the ion-exchange capacity for alkali metal ions decreased in the order of Li+>Na+>K+. The aging effect and the chemical stability were also examined.
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