Light-driven filtration antibacterial composite membrane and preparation method and use thereof

A method for preparing a light-driven filtration antibacterial composite membrane, comprising:

• step 1):
• mixing dichloromethane and N,N-dimethylformamide evenly to obtain a first solution;
• adding polycaprolactone (PCL) particles to the first solution, and stirring until being uniform to obtain an electrospinning solution;
• adding a zeolite imidazole framework-8 (ZIF-8) powder to the electrospinning solution, and ultrasonically dispersing for at least 1 hour to obtain a PCL/ZIF-8 spinning solution, wherein a volume ratio of dichloromethane to N,N-dimethylformamide is in the range of (1-10):(1-10), a ratio of volume parts of the first solution to mass parts of the polycaprolactone particles is in the range of (1-50):(1-10), and the PCL/ZIF-8 spinning solution contains 0.1-1.5 wt % of the ZIF-8 powder;
• and
• step 2):
• spraying the PCL/ZIF-8 spinning solution onto a PPCL@PDA/TAEG melt-blown membrane to obtain the light-driven filtration antibacterial composite membrane;
• wherein the PPCL@PDA/TAEG melt-blown membrane is prepared by a process comprising:
• step (1):
• preparing a master batch of mixed polypropylene and polycaprolactone, and subjecting the master batch to a membrane-forming treatment by a melt-blown machine to obtain a melt-blown membrane;
• step (2):
• mixing tris(hydroxymethyl)aminomethane hydrochloride, dopamine hydrochloride and deionized water to obtain a mixed solution, and adding dropwise 3-aminopropyltriethoxysilane thereto to adjust the mixed solution to have a pH of 8-9, to obtain a polydopamine solution;
• immersing the melt-blown membrane in the polydopamine (PDA) for 8-15 hours, taking out, washing and drying to obtain a PPCL@PDA melt-blown membrane, wherein a ratio of mass parts of tris(hydroxymethyl)aminomethane hydrochloride and mass parts of dopamine hydrochloride and volume parts of deionized water is in the range of (0.05-0.5):(0.05-0.8):(30-150);
• step (3):
• mixing 4,4′-terephthaloyl diphthalic anhydride, polyphosphoric acid and dioxane evenly to obtain a second solution;
• immersing the PPCL@PDA melt-blown membrane in the second solution at a temperature of 40-100° C. for 0.5-5 hours under stirring, taking out, washing and drying to obtain a PPCL@PDA/TA antibacterial melt-blown membrane, wherein a ratio of mass parts of 4,4′-terephthaloyl diphthalic anhydride and mass parts of polyphosphoric acid and volume parts of dioxane is in the range of (0.05-0.5):(0.05-0.5):(5-50);
• and
• step (4):
• mixing epigallocatechin gallate, polyphosphoric acid and dioxane evenly to obtain a third solution, and immersing the PPCL@PDA/TA antibacterial melt-blown membrane in the third solution at a temperature of 40-100° C. for 0.5-5 hours under stirring, taking out, washing and drying to obtain the PPCL@PDA/TAEG melt-blown membrane, wherein a ratio of mass parts of epigallocatechin gallate and mass parts of polyphosphoric acid and volume parts of dioxane is in the range of (0.05-0.5):(0.05-0.5):(5-50).