多巴胺改性聚砜复合超滤膜的二次修饰及性能评价研究

发布时间：2018-03-24 22:14

本文选题：超滤膜　切入点：多巴胺　出处：《北京化工大学》2015年硕士论文

【摘要】：膜污染是阻碍超滤膜应用的重要因素,提高膜的亲水性和抗菌性可以有效的降低膜污染。多巴胺(DA)仿生粘附的自聚合技术为膜的亲水改性和抗菌改性提供了有效的途径。本文利用DA的自聚合反应用以改性聚砜(PSf)超滤膜,接着在改性的超滤膜上负载亲水性基团和抗菌性物质,并对膜的过滤阻力、亲水性、官能团、结构和膜的抗菌性能等进行了各种表征。首先,比较了三种不同的PEG接枝到PSf-PDA复合超滤膜上的改性效果,综合接触角、膜阻力的结果对比,发现接枝氨基饰性聚乙二醇(mPEG-NH2)对膜进行改性效果最好。并且随着mPEG-NH2接枝浓度的升高,亲水性逐渐增强,膜阻力先降低后升高,在4mg·L’时有最低值。随着接枝时间的增长,膜阻力逐渐升高,亲水性逐渐增强。然后,在上述膜的基础上继续浸泡于AgNO3溶液中和PHMG溶液中,成功的在膜的表面负载了nAg颗粒和PHMG涂覆层,用大肠杆菌作为模型微生物,考察膜的抗菌性,发现膜表面形成的nAg颗粒和PHMG涂覆层使PSf膜具有显著的抗菌性能。最后,本论文分析了PSf-PDA复合膜表面复合层稳定性,对nAg涂覆层的稳定性和再生做出了探究,发现PSf-PDA膜表面的nAg颗粒可以通过将PSf-PD A膜放在AgNO3溶液中浸泡一定的时间进行再生,而PDA复合层的牢靠性有待做进一步提高。
[Abstract]:Membrane fouling is an important factor that hinders the application of ultrafiltration membrane. Improving the hydrophilicity and antibacterial properties of the membrane can effectively reduce the membrane fouling. The self-polymerization technology of dopamine DA-bionic adhesion provides an effective way for the hydrophilic and antibacterial modification of the membrane. Modified polysulfone (PSF) ultrafiltration membrane, Then the modified ultrafiltration membrane was loaded with hydrophilic groups and antimicrobial substances, and the filtration resistance, hydrophilicity, functional groups, structure and antibacterial properties of the membranes were characterized. The modification effects of three different PEG grafted onto PSf-PDA composite ultrafiltration membrane were compared. The results of comprehensive contact angle and membrane resistance were compared. It was found that the modification effect of the membrane was the best with the increase of mPEG-NH2 grafting concentration. With the increase of grafting time, the membrane resistance gradually increased and the hydrophilicity increased. The membrane was continuously immersed in AgNO3 solution and PHMG solution. The membrane was successfully coated with nAg particles and PHMG. Escherichia coli was used as a model microorganism to investigate the antibacterial properties of the membrane. It was found that the nAg particles and PHMG coating on the surface of the PSf-PDA film had remarkable antibacterial properties. Finally, the stability of the PSf-PDA composite film was analyzed, and the stability and regeneration of the nAg coating were investigated. It is found that the nAg particles on the surface of PSf-PDA film can be regenerated by soaking PSf-PD A film in AgNO3 solution for a certain time, while the stability of PDA composite layer needs to be further improved.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028.8

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