It is shown that carboxyl group is introduced into the charged membrane by infra-red spectrum,and the modified membrane rejection has significant increase from 9.23% to 89.02% while the membrane flux has only slight decrease.

• 研究结果表明；实验制备得到的荷负电膜引入了羧基基团；膜的透过率影响较少；而截留率比未改性膜提高了9倍；由9.；23%25增加到89