BPPO hollow fiber ion exchange mosaic membranes:membrane preparation and protein adsorption properties

Quaternized BPPO hollow fiber membrane was used as the starting material and modified by solgel and oxidization reactions of 3-mercaptopropyltriethoxysilane(KH580),so that ion exchange mosaic hybrid membranes containing—N+(C2 H5) 3 and—SO3 H groups were obtained.The anion and cation exchange capacities(AEC and CEC)were 1.57~1.76mmol/g and 1.07~1.24mmol/g respectively.The structure and physico-chemical properties of the membranes were characterized and then the membranes were applied for protein adsorption and desorption performances.The results showed that the swelling resistance of the ion exchange mosaic membranes was improved as compared with the base membrane.The adsorption capacities for bovine serum albumin(BSA)at pH=4,7and 8 were relatively higher and could reach more than 20 mg/g.The desorption capacity under alkaline conditions(pH=8)was obviously higher than the BPPO base membranes and could reach around 95%.The results indicate that the BPPObased ion exchange mosaic membranes can be potentially used as adsorption materials.