Electrodialytic transport properties of cation exchange membranes in the presence of cyclodextrins

摘要

After commercial cation exchange membranes (NEOSEPTA) had been immersed in an aqueous cyclodextrin solutions, electrodialysis of a 1:1 mixed solution of alkaline earth metal ions and sodium chloride matrix was confirmed by IR spectrum, X-ray photoelectron spectroscopy (XPS) and the weight increase of each corresponding component of the Membranes. As a result of adsorption of the cyclodextrins in the membranes, transport unmbers of alkaline earth metal Ions relative to sodium ions decreased compared with those of the membranes without cyclodextrins. Water content in the Membranes increased and a ratio of calcium ions (alkaline earth metal ions) to sodium ions in the membrane phase decreased After adsorption of the cyclodextrins.