Abstract
In this review, the charged structure and the principle of ionic transport of charged mosaic (CM) membrane were introduced. Novel CMs prepared by the ion–track graft polymerization method with high performance were also introduced. Because the cation–exchange and anion–exchange domains of a CM membrane are alternately arranged and these charged domains are passed through the membrane, the membrane shows high electrolyte permselectivity. The CM membranes prepared by the ion–track graft polymerization method have high mechanical strength because the cation–exchange and anion–exchange domains are covalently bonded each other. Hence, the CM membrane will have high desalination performance at high applied pressures. For example, in a piezodialysis system consisting of the CM membrane and two NaCl solutions of 500 ppm, the concentration at the high–pressure side increased while that at the low–pressure side decreased, indicating that the CM membrane have potential application to desalination of salt solutions with low salt concentrations.
