The State-of-The-Art of the Cation Exchange Membrane Having Monovalent Ion Selectivity - A Patent Review

Separation of ions with same charges but different valences using ion exchange membranes is not only desired for industrial requirements but also challenging for academic explorations. The aim of the present contribution was to review recent developments of cation exchange membranes with monovalent ion selectivity in several aspects, such as separation mechanisms, membrane-forming materials, manufacturing methods and its relevant applications reported in the open literatures, especially in the patents. And, the relevant advantages and disadvantages with respect to some cases were discussed and compared in detail. Furthermore, some future research directions in this field were also put forward tentatively.