荷電型逆浸透膜による無機イオンの分離性

概要

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Reverse osmosis separation for inorganic ions were examined by anionic and cationic charged membranes. The solute permeation was carried out in single-solute aqueous solution (300 mg/l) under applied pressure of 80kg/cm2at 20°C. In case of anionic charged membranes, the rejection of counter-ions (alkali cations) with common anion Cl- increased with the crystal ionic radius. The rejection of bi-valent cations were lower than one of uni-valent cations. The rejection of co-ions (halogen anions) with common cation Na+ increased with decrease in the crystal ionic radius. In case of cationic charged membranes, the rejection of counter-ions (halogen anions) with common cation Na+ increased with decrease in the crystal ionic radius and with increase in enthalpy for hydration of ion. The rejection of co-ions (alkali cations) with common anion Cl- increased with decrease in the crystal ionic radius. The rejection of bi-valent cations were higher than one of uni-valent cations. From these facts, operated factors in reverse osmosis separation of inorganic ions by charged membranes were discussed.
日本膜学会の論文