Abstract
Thin-film nanofiltration composite (TFNFC) membrane consisting of polyethersulfone (PES) nanofibrous support layer modified by 3, 4-dihydroxy-phenethylamine (dopamine) and interfacial polymerization (IFP) polyamide selective barrier layer was obtained in this study. The hydrophilicity of PES nanofibrous membrane was tremendously improved as the water static contact angle changed from 81.6° to 26.83° by dopamine modification. An ultrathin selective layer was produced by IFP reaction between solutions of piperazine (PIP) and trimesoyl chloride (TMC) on the dopamine modified porous PES membrane. The TFNFC membrane presented relatively high permeate flux (~59.9 L/m2h) and high salt rejection (~98.9%) to divalent anion solutions (1000mg/L, Na2SO4) at a low pressure of 0.6 MPa. It could be believed that dopamine modification would be very efficient to fabricate the composite membranes with stable structure and high filtration performance.
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