Abstract:

A novel antibacterial polysulfone (PSF) ultrafiltration (UF) membrane with capsaicin derivatives function structure was prepared. First, copolymer P(H-co-M) through the radical cause was polymerized with N-(4-hydroxyl-3-methoxyl phenmethyl)acrylamide(HMBA) and methyl methacrylate (MMA) as unconverted monomer. P(H-co-M) was confirmed by the infrared absorption spectrum(FTIR) and thermo gravimetric analysis. Then, the copolymer P(H-co-M) was introduced to PSF casting solution by the blending method, and the antibacterial UF membrane was prepared through the immersion precipitation phase-inversion method. The effects of copolymer content in the casting solution on the separation performance and antibacterial property of the UF membrane were investigated. When P(H-co-M) content was 0.5%(mass fraction), the modified UF membrane exhibited the best separation performance with flux of 122.2 L/(m²·h) and rejection of 84.4% for a 5 mg/L humic acid solution, which increased by 13.5% and 9.2% compared to the PSF UF membrane, respectively. In addition, the antibacterial performance was improved significantly. When P(H-co-M) content was 0.5%, the antibacterial rate was as high as 58.8%; When P(H-co-M) content was 1.0%, the largest antibacterial rate was obtained (80.7%). The excellent performance of the modified UF membrane indicates that the novel antibacterial UF membranes with capsaicin derivatives function structure open a new field in the high-efficient membrane materials.

Key words: Ultrafiltration membrane, Polysulfone, Capsaicin, Bacteriostasis