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Alisa Mehrparvar,Ahmad Rahimpour 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In this study, new polymeric material namely polyether sulfone amide (PESA) containing hydrophilegroup was synthesized via polycondensation reaction of diamine with dicarboxylic acid. SynthesizedPESA was used as main polymer to fabrication of novel PESA UF membranes to improve the membraneproperties especially in view of fouling reduction. The PESA membrane was modified by grafting twohydrophilic monomers i.e. 3,5-diaminobenzoic acid (DBA) and gallic acid (GA) via interfacialpolymerization. The prepared membranes were characterized by contact angle measurement,equilibrium water content (EWC), scanning electron microscopy (SEM), atomic force microscopy(AFM), FTIR-ATR analyses. Membrane performance was evaluated by measuring the pure water flux andhumic acid (HA) solute separation with dead-end filtration system. As a result, the contact anglemeasurement showed that the PESA membrane had high hydrophilic surface. Also, super hydrophilicsurfaces were introduced by grafting DBA and GA on the surface of PESA membrane. The SEM imagesproved the formation of large finger-likes in the sublayer for PESA membrane. Filtration tests showedthat pure water flux and HA solution flux of the PESA membranes were higher in comparison to the PESmembrane. Although fluxes were obviously decreased after grafting monomers onto the PESAmembrane surface, higher HA separation efficiency was achieved. Meanwhile fouling tendency wasdecreased. All these results indicated that the new PESA modified membranes showed superiorperformance compared to the PES membrane. Furthermore, GA was found to be the most effectivehydrophilic monomer to improve the membrane hydrophilicity and fouling resistibility.