羧酸在笼形聚偕氨肟树脂上吸咐

碱处理笼形聚偕氨肟树脂（BCAO）对羧酸表现出强的吸附能力。一元羧酸在BCAO树脂上以多层吸附为主要特征。二元和三元羧酸则以单层吸附占优势。后者可能是以双阴离子的一个负极吸着在BCAO树脂表面，形成了对其他羧酸阴离子起排斥作用的负离子场。另外，双阴离子也有可能和两个氨基结合形成次级交联，妨碍着其他离子迁移和扩散。

Adsorption of carboxylic acids by "cage" polyamidoxime adsorbent

The alkali-treated "cage" polyamidoxime adsorbent (BCAO) possesses the high adsorptivity for the adsorption of carboxylic acids. The monocarbxylic acids uptaken by BCAO were found to be multilayer adsorption predominately. On the other hand, the monolayer adsorption is the main way for the dibasic and tribasic acids adsorbed by BCAO.The later was considered to play the role of a bianion which is adsorbed onto the surface of BCAO with negative pole and form an ion-field to repel other carboxylic ions. Moreover, it may also be captured by two amine groups to yield a crosslinked network, which hinders the migration and diffusion of ions.