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.
Huang Jian, Tang Shigang, Yang Yunfeng
. Fabrication and performance of anti-bacterial ultrafiltration membrane based on mussel-inspired technology[J]. New Chemical Materials, 2021
, 49(1)
: 264
-268
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.01.058
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