Synthetic inorganic ion exchange materials XLIV: Synthesis and ion exchange properties of cubic niobic acid (HNbO{sub 3})
A cubic niobic acid (C-NbA) was synthesized by Li{sup +}/H{sup +} ion exchange reaction with an 8 M (mol dm{sup {minus}3}) nitric acid solution from LiNbO{sub 3}. The LiNbO{sub 3} was obtained by heating a mixture of Li{sub 2}CO{sub 3} and Nb{sub 2}O{sub 5} with molar ratio of 1:1 at 900 C for 24 h. X-ray diffraction pattern of C-NbA was indexed to a cubic structure (space group Im3), with the lattice constant a{sub o} = 7.6445 {angstrom} ({angstrom} = 100 pm). The C-NbA product showed an exchange reaction equivalent to one proton per one Li{sup +} in a mixed solution of lithium nitrate and lithium hydroxide. The pH titration curves of C-NbA on the Li{sup +}/H{sup +} exchange system indicated a weak monobasic acid. C-NbA showed high uptake for lithium ions, whereas no appreciable amount of uptake was observed for other alkali metal ions in the pH range 4--12. An extremely high selectivity was found for lithium ions, and the separation factor ({alpha}) of lithium ions to other alkali metal ions was higher than 10{sup 3}.
- Research Organization:
- Tokyo Inst. of Tech. (JP)
- OSTI ID:
- 20006464
- Journal Information:
- Materials Research Bulletin, Vol. 34, Issue 9; Other Information: PBD: 1 Jul 1999; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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