Selectivity of anion exchange resin modified with anionic polyelectrolyte
Selectivity of anion exchange resin modified with anionic polyelectrolyte
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DOI：
10.2116/analsci.13.345
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发表时间：
1997-06-01
影响因子：
1.6
通讯作者：
Sata, T
中科院分区：
文献类型：
--
作者：
Matsusaki, K;Hashimoto, N;Sata, T
为了改变阴离子交换树脂的离子交换选择性，特别是增加二价阴离子的交换难度，采用阴离子交换剂萘磺酸钠与甲醛的缩聚物对凝胶型阴离子交换树脂进行表面改性。聚合物吸附后，离子交换容量下降，离子交换反应速率变慢，但两种阴离子之间的离子交换平衡常数没有改变。尤其是二价阴离子的交换速率比一价阴离子的慢。由于在树脂颗粒上形成了阴离子交换层，阴离子与阴离子交换位点的离子交换由于该层的筛分效应而被延迟。二价阴离子与一价阴离子相比，由于存在与离子交换基团电荷相反的层，变得难以进行离子交换。用改性的阴离子交换树脂分离硝酸根离子和硫酸根离子。
In order to change the ion-exchange selectivity of anion exchange resin, especially to make the ion-exchange of divalent anions more difficult, the surface of gel-type anion exchange resin was modified by the adsorption of an anionic polyelectrolyte: polycondensation product of sodium naphthalene sulfonate and formaldehyde. After the adsorption of the polymer, ion exchange capacity decreased and the rate of ion exchange reaction became slow, though ion exchange equilibrium constants between two anions did not change. Especially, the ion exchange rate of divalent anions was slower than that of the monovalent anions. Because an anionic polyelectrolyte layer was formed on the resin particle, the ion exchange of anions with anion exchange site was retarded by a sieving effect due to the layer. The divalent anions became difficult to ion exchange compared with the monovalent anions due to the existence of the layer which was charged opposite to the charge of the ion exchange groups. Using the modified anion exchange resin, separation of nitrate ions from sulfate ions was attempted.