Journal
POLYMERS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym9100505
Keywords
polysulfone; polyethylene glycol; thin-film composite polyamide membrane; interfacial polymerization; nanofiltration
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Funding
- Ministry of Science and Technology of Taiwan [MOST 105-2218-E-033-001]
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Membrane support properties influence the performance of thin-film composite nanofiltration membranes. We fabricated several polysulfone (PSf) supports. The physicochemical properties of PSf were altered by adding polyethylene glycol (PEG) of varying molecular weights (200-35,000 g/mol). This alteration facilitated the formation of a thin polyamide layer on the PSf surface during the interfacial polymerization reaction involving an aqueous solution of piperazine containing 4-aminobenzoic acid and an organic solution of trimesoyl chloride. Attenuated total reflectance-Fourier transform infrared validated the presence of PEG in the membrane support. Scanning electron microscopy and atomic force microscopy illustrated that the thin-film polyamide layer morphology transformed from a rough to a smooth surface. A cross-flow filtration test indicated that a thin-film composite polyamide membrane comprising a PSf support (TFC-PEG20k) with a low surface porosity, small pore size, and suitable hydrophilicity delivered the highest water flux and separation efficiency (J = 81.1 +/- 6.4 Lm-2h-1, R-Na2SO4 = 91.1% +/- 1.8%, and R-NaCl = 35.7% +/- 3.1% at 0.60 MPa). This membrane had a molecular weight cutoff of 292 g/mol and also a high rejection for negatively charged dyes. Therefore, a PSf support exhibiting suitable physicochemical properties endowed a thin-film composite polyamide membrane with high performance.
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