基于贻贝仿生技术,利用多巴胺(DA)与聚乙烯亚胺(PEI)共沉积体系,将聚多巴胺(PDA)沉积在聚醚砜(PES)超滤膜表面,并进一步将纳米银负载其表面,制备出Ag-PDA/PES复合膜。采用场发射扫描电镜、X射线光电子能谱分析和表面接触角等方法对复合膜表面形貌、化学性质、分离性能及抗生物污染性能进行表征。结果表明,当PDA沉积在膜表面之后,PES膜的接触角由70.5°降至35.8°,纯水通量由262L/(m2·h)提高至315L/(m2·h)。抑菌性能实验表明,Ag-PDA/PES复合膜表面抗菌率达98%,对铜绿假单胞菌和大肠杆菌具有优良的抗菌性能。模拟废水分离实验表明,Ag-PDA/PES复合膜对含腐植酸废水具有良好的分离性能,连续过滤12h后,通量仍高达165.9L/(m2·h),相比于初始通量仅下降了12.4%,明显优于未改性膜。
Membrane biofouling is the bottleneck which restricting the development of membrane separation technology.It is of great significance to fabricate composite membranes with anti-biofouling and excellent separation performance for the development of ultrafiltration membranes.Based on mussel biomimetic technology,polydopamine (PDA) was deposited on the surface of polyethersulfone (PES) ultrafiltration membrane by using dopamine (DA) and polyethyleneimine (PEI) co-deposition system,and further loaded with nano-silver on the membrane surface to fabricate Ag-PDA/PES composite membrane.The membrane surface morphology,surface chemical properties,separation properties and biofouling performance were characterized by field emission scanning electron microscopy (SEM),XPS and surface contact angle.The results indicated that the contact angle of the PES film was reduced from 70.5° to 35.8°,and the pure water flux was increased from 262L/(m2·h) to 315L/(m2·h) when the PDA was deposited on the surface of the film.The antibacterial performance experiment showed that the surface antibacterial rate of Ag-PDA/PES was 98%.The composite membrane had excellent antibacterial properties against Pseudomonas aeruginosa and Escherichia coli.The simulated wastewater separation experiments shown that the Ag-PDA/PES had good separation performance for humic acid-containing wastewater.After 12 hours of continuous filtration,the flux was still as high as 165.9L/(m2·h),compared with the initial flux.It decreased by 12.4%,which was significantly better than the unmodified membrane.
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