화학공학소재연구정보센터
Journal of Membrane Science, Vol.528, 1-11, 2017
Cell membrane mimetic coating immobilized by mussel-inspired adhesion on commercial ultrafiltration membrane to enhance antifouling performance
A facile method of modifying commercial polyethersulfone ultrafiltration membrane (PESUM) was developed based on mussel adhesive mimetic polydopamine (PDA) and cell membrane antifouling phosphorylcholine (PC). The PESUM was firstly coated with a thin PDA layer to confer the membrane adhesive property. A cell membrane mimetic and mussel adhesive mimetic random copolymer (PMEND) bearing both antifouling PC zwitterions and adhesive dopamine groups at different side chains was then immobilized onto the PDA surface by dopamine adhesion from the aqueous solution. The immobilized PMEND spontaneously formed a cell outer membrane mimetic film on the PESUM/PDA surface, which was stable in air, gasoline and pH 3-10 water for more than 2-weeks. Importantly, the water flux of this PESUM/PDA/PMEND membrane could be recovered up to 100% and 93% after one and three cycles of fouling by 1.0 mg/mL BSA solution ultrafiltration, respectively. More importantly, the modified membrane could remove more than 99.99% of oil from an 80,000 ppm gasoline/water emulsion. Furthermore, this PDA mediated cell outer membrane mimetic modification strategy is substrate independent and can be applied to other membranes and surfaces to enhance antifouling performance.