Preparation of PDA/PEI-PVDF hollow fiber composite ultrafiltration membranes via the combining of co-deposition and cross-linking
Polyvinylidene fluoride(PVDF)membranes are extensively employed across various fields owing to their remarkable chemical stability,elevated temperature resistance,and robust mechanical strength.The precise modulation of membrane pore dimensions and hydrophilicity plays a pivotal role in optimizing membrane separation efficiency,stability,and longevity.In this study,we proposed a co-deposition method of dopamine(DA)and polyethyleneimine(PEI)with cross-linking through glutaraldehyde to regulate the pore size and hydrophilicity of PVDF hollow fiber membranes.Reduction of the pore diameter from(119.0±3.55)nm to(16.2±0.36)nm and contact angle from 107.7° to 61.4° was achieved,simultaneously achieving membrane pore size and hydrophilicity regulation,leading to the preparation of a high-performance PDA/PEI-PVDF hollow fiber hydrophilic ultrafiltration membrane.The resulting membrane exhibited a rejection rate of more than 95％for 20 nm silica nanoparticles.The findings of this study provide a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.
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