| 초록 |
The electrodialytic separation characteristics of large molecular organic acid (lysine-HCl) in highly water-swollen poly(vinyl alcohol)/poly(styrene sulfonic acid-co-maleic acid) (PVA/PSSA-MA) cation-exchange membranes were investigated. The PVA/PSSA-MA membranes exhibited 2-3 times higher water swelling ratio than those of commercial membranes, CMX and CM-1 (Tokuyama Corp., Japan). For the PVA/PSSA-MA membrane the relative ratio of the ion transport numbers (t lysine/t sodium) slightly increased. Also, the PVA/PSSA-MA membrane showed remarkably lower membrane electrical resistance than commercial membranes for lysine. Moreover, the relationship between the free volume in the membrane and the ionic size was investigated. The results showed that the PVA/PSSA-MA membrane had more proper free volume distribution for separating large molecular ions. Further, the energy efficiency in the electrodialysis could be improved. The amount of lysine-H+ ions transported through the PVA/PSSA-MA membrane was approximately five times greater than those of through the CMX and CM-1. |
