Polypropylene hollow fiber membrane based on dopamine hydrophilic modification and oil-water separation performance study
Based on the oxidative self-polymerization mechanism of dopamine(DA),the two were cross-linked and coated on the surface of polypropylene hollow fibre membrane(PPHFM)through a ring-opening reaction between the epoxy group on 3-(2,3-epoxypropyloxy)propyltrimethoxysilane(KH560)and a primary amine on polyethyleneimine(PEI),and then dopamine(DA)is oxidized to quinone groups in a weakly alkaline environment and reacts with the amino group of the PEI in a Michael addition or Schiff base reaction,which further cross-links the DA with the PEI,which is then coated on the film surface.The membrane surface chemical composition and surface morphology were characterised by ATR-FTIR,XPS,SEM and AFM,and the hydrophilicity and oil-water separation properties of the modified membrane were also tested.The results showed that the pure water flux of the modified membrane was increased from(124.8±6.3)kg/(m2·h)of the original membrane to(363±8.1)kg/(m2·h).The separation efficiencies for different types of oil-in-water emulsions were all above 96％,and the flux recovery rates were all higher than 86％,indicating that the PHFM-KH560/PEI-PDA membranes have good permeability,resistance to oil contamination and reusability.In addition,the modified membranes showed good chemical stability in acidic,weakly alkaline and high concentration salt solution environments,which is conducive to the efficient treatment of oily wastewater with complex composition and has broad application prospects.
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