Fabrication Of Anti-fouling And Chlorine Resistence Nanofiltration Membrane And Study On The Performance

The antifouling and resistance to oxidation ability of nanofiltration membrane, asthe important factors, restrict the development and the application of nanofiltration inthe water treatment industry. At present, the preparation of nanofiltration membraneswith excellent antifouling and oxidation resistance property becomes an importantproblem in the research field. This thesis mainly about using the post-processingphase transformation method and interfacial polymerization to prepare the antifoulingand oxidation resistance nanofiltration membranes to improve the nanofiltrationmembrane application efficiency, and it has important application value.First, using the phase transformation membrane post-processing method, PluronicF127/PES nanofiltration membrane with the high flux, antifouling ability andresistance to oxidation. The research shown that, through the dry in air after period oftime, Pluronic F127/PES nanofiltration membranes reflected the smaller irreversiblecontraction, and after immersed in water, the water content is higher. Using BSA andSA as foulant, the antifouling experiments pointed out that the flux recovery rate canreach99.99%. Resistance to oxidation capbility study shown that the Pluronic F127/PES nanofiltration membranes which were immersed in high levels of NaClOsolution for several days, are with increase flux and the rejection of Alux blue are stillmore than95.7%.Secondly, using the interfacial polymerization method to parpare the nanofiltrationmembrane with hydrophilic and antifouling capbility. Choosing PIP for aqueousmonomer, TMC for oil phase monomers, the preparation PIP-TMC/Pluronic F127/PES nanofiltration membrane with interfacial polymerization of high flux andantifouling layer. Research points out that the PEO segment chain can achieve onthe membrane surface due to the surface segregation, and with the cooperation ofinterfacial polymerization layer to improve the nanofiltration membrane separationand fight pollution performance. Antifouling experiments shows thatPIP-TMC/Pluronic F127/PES nanofiltration membrane has an excellent antifoulingperformance and it shows that there are little flux decline (5.2%) and almost100%flux recovery.Thridly, using the interfacial polymerization, natural materials for aqueous tannicacid monomers and TMC for oil phase monomer are chosen through the interfacialpolymerization process in the PES membrane surface preparation interfacial polymerization layer to prepare the tannic-TMC/PES nanofiltration membrane.Because of the advantage of natural material tannin acid: the native adhesion,thehydrophilic capbiltiy and a lot of phenolic group contented, the nanofiltrationmembranes, for different kinds of the pollutants, have excellent antifoulingperformance, and its resistance to oxidation property is much better than interfacialpolymerized polyamide nanofiltration membrane, and it shows that the tannic acid asa natural material can be a new material for interfacial polymerization for nanoflrationmemebrane.Finally, using the interfacial polymerization method to parpare BSA-TMC/PCnanofiltration membrane, the bovine serum protein (BSA) for aqueous monomer,TMC for oil phase monomer, in the PC membrane surface has formed a nano level ofnanofiltration membrane. Because of the characteristics of the BSA, ensured thenanofiltration membrane separation characteristics at the same time, the nanofltraionmembrane shows stimulate response performance to the pH value and different saltion concentration.