Thin Film Composite Nanofiltration Membranes With The P84 Substrate

Thin film composite（TFC）nanofiltration（NF）membranes have attracted more attentions in recent years,focusing on the improvements of membrane flux and rejection,as well as organic solvent resistance.In this thesis,we synthesized the TFC NF membranes using the substrate of p84 polyimide,and assessed the separation performance of as-prepared membranes.We initially synthesized a composite nanofiltration（NF）membrane using polyethylene polyamine（PEPA）and trimesoyl chloride（TMC）as monomers on a crosslinked p84 polyimide（C-P84）membrane via interfacial polymerization,we assessed the membrane?s separation performance in organic solvents.Through attenuated total reflectance Fourier transform infrared（ATR-FTIR）and scanning electron microscopy（SEM）.we observed that TMC reacts with PEPA to form polyamide bonded structures on the C-PEI support.The PEPA-TMC NF membrane exhibits good separation performance in methanol.The optimal membrane shows the methanol permeance about 130 L m^-2 h^-11 bar^-1,the rejection of 83%for Rose Bengal（RB,1017Da）.Further,we adopted another monomer,cyanuric acid（CA）,and trimesoyl chloride（TMC）as monomers on a crosslinked p84 polyimide（C-P84）membrane via interfacial polymerization to synthesize CA-TMC NF membrane.The optimal membrane NF-3CA shows the DMF permeance about 11.6 L m^-2 h^-11 bar^-1,the rejection of 92%for crystalviolet（CV,407.98Da）.The polyamide NF membrane can be effectively used for the recovery of drug residues from organic solvents in the pharmaceutical industry.