Development and comparative study of different nanofiltration membranes for recovery of highly charged large ions

The development of membranes for polyoxometalate (POM) recycling based on charge or size effects is described. POM recycling via nanofiltration with surface charge membranes is a new approach. From the properties of solute–membrane interaction three different kinds of nanofiltration membranes have been selected to find out most suitable one for recycling process. A new generation surfactant templated inorganic silica film has been prepared and characterised. This type of material could be promising for future NF membrane applications.

The preparation and characterization of three different types of membranes for large ion recovery from water by investigating the retention of polyoxometalate type anions [PMo12O40]3!. It has been shown that in the pressure range of 2– 10 bar, (-alumina membrane shows a high water flux and higher POM retentions than its organic counter parts Nafion and Nafion/silica hybrid. A new generation of surfactant-templated inorganic silica film has been prepared and characterised. This type of material could be promising for future NF applications.