EDTA冠醚衍生物(Ⅴ)——EDTA-二氨基二苯并冠醚缩聚物的合成及其对金属离子吸附行为初探

Crown Ether Derivatives of EDTA (Ⅴ)——Synthesis of EDTA-Diaminodibenzocrown Ether Polyconden- sate and Preliminary Study on Their Adsorption Behavior for Some Metal Ions

在环上含多羧基的冠状聚合物能吸附海水中铀。我们继前文合成了一类在主链上含多个羧甲基的聚酰胺酸3_(a-c)。为了考查冠醚环和羧基对聚合物吸附金属离子的影响,还制备了无冠醚环的3_d,以及3_(a-d)的无羧基衍生物聚酰亚胺4_(a-d)作对照物。其合成路线如下:

EDTA dianhydridc reacted with 4,4' -diaminodibenzocrown ethers or 4,4'-diaminobiphenyl to give polyamido acids 3a-d, bearing pendant carboxymethyl groups on the chain. 3a-d were heated under vacuum to form polyimides 4a-d. The adsorption behavior of the polymers for U(Ⅳ)> U(Ⅵ), Au(Ⅲ) and K( Ⅰ ), etc. was examined. The preliminary experiment shows that the polyamido acids are superior to the polyimides in adsorbability for some metal ions and the cis-polyamido acid 3., is the most excellent one among the 8 polymers. 3a has the capacity of 97.5 mg U(Ⅵ)/g, 976 mg Au(Ⅲ)/g and 10.6 mg K(Ⅰ)/g, respectively.