The State-of-The-Art of the Cation Exchange Membrane Having Monovalent Ion Selectivity - A Patent Review
Meng Wang and Cong-jie Gao
Affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
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.
Keywords: Electrodialysis, cation exchange membranes, monovalent ion selectivity, surface modification, nanofiltration, desalination of seawater, osmosis, energy-consumption, hydrometallurgy, monovalent ion
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