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- W2000456513 abstract "The potentiometric ion-exchange titrations of niobium antimonate have been performed for the systems Li+/H+, Na+/H+, K+/H+ and NH4+/H+. Samples at each step of exchange have been characterised by X-ray diffraction analysis. It is concluded that the alkali metal ion exchange in niobium antimonate occurs without phase transition and the exchanger shows a trifunctional acid behavior. The ion exchange capacity of the material is 3.69 meq g−1. At pH 7 the proton exchange by Li+, Na+, K+and NH4+ is 1.05, 1.70, 1.25 and 1.60 meq g−1 respectively. Thus the exchanger produces a wide range of acidities as is found in noncrystalline or semicrystalline ion exchange materials. The column ion-exchange capacity for the univalent metal ions has been determined and compared with those of a batch experiment. The low ion exchange capacity—observed in column operation has been interpreted in terms of slow kinetics of the ion exchange process." @default.
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- W2000456513 date "1978-01-01" @default.
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- W2000456513 title "Ion exchange behaviour of crystalline niobium antimonate towards alkali metal ions" @default.
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- W2000456513 doi "https://doi.org/10.1016/0022-1902(78)80439-4" @default.
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