共混制备抗菌聚醚砜中空纤维超滤膜及其表征

PREPARATION AND CHARACTERIZATION OF ANTIBACTERIAL POLYETHER SULFONE HOLLOW FIBER ULTRAFILTRATION MEMBRANE

辣素衍生物N-（4-羟基-3-甲氧基-苄基）丙烯酰胺HMBA和乙烯基单体（丙烯酸乙酯和丙烯酰胺）通过溶液聚合方法合成的共聚物HAE，将这种共聚物做为抗菌材料与聚醚砜共混均匀形成铸膜液，通过干-湿相转化法制备改性中空纤维超滤膜。铸膜液中共聚物的质量分数为0～3％，通过傅里叶红外全反射FTIR-AIR、水静态接触角（CA）、扫描电子显微镜（SEM）、错流过滤评价仪、抗菌实验、长期抗耐污染性实验对纤维膜进行表征及分析。结果表明，共混改性之后中空纤维超滤膜表面含有亲水基团，膜表面的接触角显著降低；当HAE在铸膜液中的质量分数为1％时，膜的纯水通量能达到193．7L／（m^2·h），膜对牛血清蛋白的截留率为95％，相对基膜分别提高90．5％和5．5％，通过去离子水清洗之后膜的通量恢复率能达到90．82％；抗菌性随着共聚物含量的增加而增强，当HAE的质量分数为3％时，超滤膜的抗菌率达到90％。由长期的耐污染测试发现改性膜对微生物具有很好的抵抗能力。

Antibacterial copolymer was synthesized by capsaicin derivatives （HMBA）, ethyl acrylate （EA） and acrylamide （AA） with solution polymerization method. Then the copolymer was blend with PES to prepare casting solution, which was used to prepare antibacterial hollow-fiber ultrafiltration membrane through the L-S phase inversion and dry-wet spinning method. The content of copolymer in casting solution was varied from 0-3%. The membranes were characterized by FTIR-ATR, contact angle （CA）, SEM, cross-flow filtration unit, antifouling and antibacterial measurements. The verification of copolymer that blended with PES was confirmed through FTIR-ATR. As a result, the hydrophilicity of the modified membranes decreased significantly. When mass fraction of copolymer was 1.0%, the modified UF membrane exhibited the best separation performance with pure water flux of 193.7 L/（m^2·h） and BSA rejection rate of 95%, which increased by 90.5% and 5.5% compared to the unmodified membrane, respectively. Moreover, the flux recovery rate of modified membranes can reach 90,82%, which was superior to that of the unmodified membrane. The antibacterial rate of the modified membranes was increased with the increasing of copolymer content, which was achieving 90% when the mass fractinn ofcopolymer was 3.0% . Long-term test in tap water also confirmed that the modified membranes had excellent anti-biofouling performance.