ポリビニルアルコールとポリアクリル酸のブレンド膜による遷移金属イオンの能動輸送

概要

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Water-insoluble PVA-PAA membranes were prepared by casting method from poly (vinyl alcohol), poly (acrylic acid) and formaldehyde. The transport behaviors of transition metal ions through the membrane were investigated under various conditions. Transition metal ions were actively transported through the PVA-PAA membrane against their concentration gradient from alkaline side (source phase) to acidic side (receiving phase). The high transport ratio for Cu2+ was maintained for a long time, and the transport from neutral side to acidic side was not observed. It is interesting to note that the active transport was observed even when pH of receiving phase is in a range of neutrality. The rate of active transport depends strongly on pH of the source phase of metal ions rather than pH of the receiving phase. On the other hand, the transport through PVA membrane was negligibly small. Although the separation factor is approximately constant for the PAA content in the PVA-PAA membrane, the premselectivity coefficient and the transport rate of metal ions varied with PAA content. When the PAA content in the membrane is about 10 mol%, Cu2+ was most selectively transported. For the competitive transport of transition metal ions, the transport selectivity is in following order : Cu2+>Ni2+=Zn2+>Co2+.
日本膜学会の論文