Preparation of poly(tetrafluoroethylene-co-hexafluoropropylene)hollow fiber composite membrane for dye/inorganic salt separation
The use of membrane separation technology for dye desalination is of great significance for the clean treatment and resource recovery of textile printing and dyeing wastewater.In this paper,poly(tetrafluoroethylene-co-hexafluoropropylene)(FEP)hollow fiber porous membrane prepared by melt spinning was utilized as the base membrane.The surface hydrophilicity of FEP hollow fiber composite membrane was improved by co-deposition of catechol(CA)and polyethylenimine(PEI)on the membrane surface,and the interfacial polymerization process was optimized by polypyrrole(PPy)as the intermediate layer.Finally,the FEP hollow fiber composite membrane was fabricated.The results showed that the water contact angle of the membrane was reduced from 122 to 39° after modification,and the hydrophilicity was improved.When the concentration of pyrrole was 10％(mass fraction),the composite membrane had the best comprehensive performance.The rejection of dyes such as Coomath brilliant blue and Congo red were above 95％,while the rejection of salts such as NaCl and MgSO4were all below 8％,which could realize the efficient separation of dyes and inorganic salts.Furthermore,when the FEP hollow fiber composite membrane was tested at 80℃ and treated with organic solvent,the dye rejection remained stable,indicating excellent resistance to heat and solvents.In addition,FEP hollow fiber composite membrane was capable of achieving the separation of binary dyes.
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