Preparation and Performance Optimization of a Composite Charged Mosaic Membrane via Interfacial Polymerization

Abstract

A composite charge-mosaic membrane was prepared via interfacial polymerization by coating a thin selective layer onto the surface of a micro-porous polyethersulfone hollow fiber membrane. 2,5-Diaminobenzene sulphonic acid, polyethylemine and trimesoyl chloride were selected as the monomers and 4-(chloromethyl) benzoyl chloride and trimethyl amine as the chemical modification agents. The process was optimized by means of uniform design and the model was in good agreement with the experimental data. For the binary mixtures, the rejection for the inorganic salts was less than 30 % and the rejection for sucrose was approximately 90 %. The separation performance in the ternary mixtures was also studied and the separation factor decreased with the increasing of salt concentration and the interaction between salt and organics had some effect upon separation factor. Finally, the results of SEM and atomic force microscope showed that a dense selective layer on the support membrane was formed after interfacial polymerization.