笼形聚偕氨肟树脂的研究──Ag(Ⅰ)在树脂上的吸附过程

Studies on "cage" polyamidoxime adsorbents──adsorption of silver (Ⅰ)

测定了Ag+离子在笼形聚偕胺肟树脂（CAO）及其酸、碱处理产物（ACAO、BCAO）上的吸附容量．Ag+离子在BCAO树脂上吸附容量较高，但同非选择性吸附，在ACAO上的吸附容量则与处理树脂的酸的pKa值有关．用高pKa值的硼酸、苯酸和对氨基酚处理所得的ACAO树脂的吸附容量接近BCAO树脂的水平，认为是胶后胺肟基发生互变异构所致．吸附动力学表明Ag+离子在H3BO3/ACAO和C6H5OH/ACAO树脂上进行多层吸附．在吸附中伴随有氧化还原反应并生成Ag（O）微晶的过程．

The adsorption capacities of Ag+ ions absorbed by 'cage' polyamidoxime (CAO) and the acid - and alkali - treated products (ACAO and BCAO) were determined.BCAO adsorbs the Ag+ ions in a higher capacity, but have poor selectivity. In the case of ACAO, the adsorption capacity increases with increasing the pKa value of an acid used to treat the adsorbents. When the ACAO were obtained by treated with boric acid,phenol, or p-aminophenol, the level of adsorption capacity is showed to be close to BCAO. It is considered that the increase of the Ag+ ions uptake is related to the tautomerization of the amidoxime groups. The multilayer adsorption predominates in the Ag+ ions adsorbed by H3BO3/ACAo and C6H5OH/ACAO observed from the adsorp-tive kinetics. The redox and cry8tallization are taking place ouring the adsorption pro-cess.