强碱弱酸两性树脂吸附电解质机理

THE MECHANISM OF ELECTROLYTE ABSORPTION ONTO STRONG BASE-WEAK ACID AMPHOTERIC RESINS

本文通过电位滴定曲线及静态吸附法等测定强碱弱酸型两性树脂在不同ｐＨ及不同盐浓度的条件下吸附电解质机理．主要结果是ｐＨ≤２时，以离子交换为主，ｐＨ２→７时由于内盐键破裂而等当量吸附阴、阳离子作用逐步增强，ｐＨ≥７时则以内盐键破裂而吸附离子为主，在有多种反离子存在时则同时发生离子交换作用，在这种ｐＨ范围的离子选择性显著大于在ｐＨ７以下范围。本文还就吸附机理如何指导生产应用作了探讨．

Absorption of electrolytes is dependent on solution pH. At pH ≤2, amphoteric resins play a role as strong base resins; the absorption of electrolytes takes place according to the anion exchange mechanism, At pH2～7, the molecular sorption by breaking of innersalt bonds increases gradually. At pH≥7,the principal absorption is the molecular sorption by breaking innersalt bonds as well as ion exchange.At the same time, the ion selectivity obviously increases, which may be useful in the softening of concentrated NaCl solution.