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Effect of DS on the Structure and Charged Properties of SPSf/PVDF Blend Membranes via Immersion Precipitation Process

Membrane technology is been widely used in drinking water treatment in order to meet the stringent water quality standards. Among the membrane processes, hydrophilic and charged modification of Ultrafiltration(UF) membranes with high filtration efficiency and antifouling properties are being paid more attention. In this work, sulfonated polysulfone (SPSf) with different degree of sulfonation(DS) was used as the modifier to improve the hydrophilic and charged properties of PVDF blend membranes. FTIR and SEM were used to investigate the chemical structure, polymorphism and morphology of the membranes. The charged and hydrophilic properties of the membranes were investigated by zeta potential analyzer and water contact angle instrument. It was found that, for all the investigated cases, the sulfonic acid groups of SPSf could migrate onto the surface of the membranes by surface segregation, which made SPSf/PVDF blend membranes have good charged and hydrophilic properties. DS of polysulfone(PSf) also affected the morphology of the membranes, a tendency toward regular granular structure, larger average pore size and porosity with the addition of SPSf in the membranes was observed. These phenomena all suggested that SPSf/PVDF blend membranes might have a potential application in the drinking water treatment.