Inorganic Anion Exchange Membrane Prepared from Hydrotalcite Like Compounds

• Published in: Journal of Ion Exchange Vol. 5; no. 2; pp. 32 - 39
• Main Authors: IURA, Katsuhiko, KOGURE, Makoto, KANZAKI, Yasushi, TANAKA, Tatsuo
• Format: Journal Article
• Language: English
• Published: Japan Society of Ion Exchange 1994
• ISSN: 0915-860X; 1884-3360
• DOI: 10.5182/jaie.5.32

Inorganic anion exchange membranes were prepared from the powdered hydrotalcite like materials as anion exchangers and polyvinylidene fluoride as a binder for the membrane fablication. Following hydrotalcite like materials (combination of di- and tri-valent metal ions) were prepared, Mg (II) -Al (III), Ni (II) -Al (III), and Co (II) -Al (III) systems. Each powdered material was dispersed in dimethylkformamide solution of polyvinylidene fluoride and spreaded on a glass dish to form a membrane. The electric resistance measured was ranging 200-700 Ω⋅cm-2 and 80-150 Ω⋅cm-2 at 25°C and 80°C, respectively. The plots of membrane potential vs. log of NaCl activity were linear between 10-3 -1 mol⋅dm-3. The transport numbers for Cl- ions were around 0.94 at 80°C which approached 0.99 for the comercially available organic anion exchange membrane. The thermal stability was superior to that of organic anion exchage membrane.