离子交换与吸附

本文系统研究了以聚丙烯(PP)无纺布为基体的,通过电子束预辐照引发接技共聚的方法制备的丙烯酸(AA)和一缩二乙二醇双丙烯酸酯(DGA)与PP的接技共聚物PP—g—PAA—DGA阳离子交换纤维对八种稀土离子的交换行为。发现交换量大,交换速度快,温度,溶液的pH值对交换的影响很大。吸附了稀土离子的纤维可用少量的稀HCl解吸,达到浓缩稀的稀土溶液的目的。经廿次交换—解吸循环后纤维的交换容量基本不变。表明它具有良好的交换稳定性。

The sorption behaviour of weak acidic cation-exchange fiber containning carboxy group PP-g-PAA-DGA, which has been obtained by the preirradiated induce graft copolymerization of acrylic acid (AA) and diglycolic carylate (DGA) into polypreperene (PP) non-woven fabrics, towards rare earth metal ions has been investigated in this paper. The results indicated that the sorption amount is suitably large and the sorption rate is very fast. Temperature, ( ) specially the pH value of the solution significantly influences them. Fiber, which has absorbed rare earth metal ions, can be desorbed by using dilute acid HCl. This result demonstrated the possibility of concentration of dilute rare earth metal ions solution using this material. After 20 times sorption-desorption cycles the cation -exchange fiber still possessed the same exchange capacity as original. It demonstrates that the ion exchange stability of this fiber is very good.