A kind of preparation method of inorganic/organic hybrid antibacterial film
An organic hybrid and inorganic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems affecting operating costs, short backwash cycle, high energy consumption, etc., to improve service life and use The effect of less quantity and simple processing technology
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Embodiment 1
[0043] Common A-type (3A, 4A or 5A), X-type, and Y-type molecular sieves are used as silver-loaded substrates, with a particle size of 0.5-7 μm, and silver nitrate (AgNO 3 ) or silver perchlorate (AgClO 4 ) is the silver ion donor. The silver salt is configured as a 0.025mol / L aqueous solution, and a certain amount of any one of the above-mentioned molecular sieves is added to the silver salt aqueous solution, stirred mechanically at 50°C for 2h, and the obtained molecular sieve is washed with pure water, and dried at 80°C for 4h. Repeat the above steps twice to obtain the molecular sieve loaded with silver ions.
[0044] Configure 0.04mol / L sodium borohydride (NaBH 4 ) aqueous solution, the molecular sieve loaded with silver ions that takes a certain amount of preparation adds NaBH 4 In the aqueous solution, stir at 0°C for 20 minutes, wash the obtained molecular sieve with pure water, and dry at 80°C for 8 hours to obtain the molecular sieve loaded with nano-silver partic...
Embodiment 2
[0046] Polyvinylidene fluoride (PVDF) is used as the film-forming substrate (the mass fraction of PVDF in the casting solution system is 17%), and dimethylacetamide (DMAc) is used as the solvent (the mass fraction of DMAC in the casting solution system is 77%) , polyvinylpyrrolidone (PVP, the mass fraction in the casting solution system is 5%), the nano-silver 3A molecular sieve antibacterial agent prepared by example 1 and the silane coupling agent (KH550) are additives (the mass fraction in the casting solution system is respectively 0.5% and 0.5%), prepared as a spinning solution at room temperature. Using dry-wet spinning process, spinning through a circular porous spinneret with an air gap of 10 cm, passing through a coagulation bath at a certain temperature, and then guiding to the winding wheel through a guide wheel; after the film is cut into sections, it is bundled and immersed Wash with ultra-filtered water and store in 30% glycerol aqueous solution. The prepared an...
Embodiment 3
[0048] Polyacrylonitrile (PAN) is used as the film-forming substrate (mass fraction in the casting solution system is 17%), dimethylformamide (DMF) is the solvent (the mass fraction of DMF in the casting solution system is 76%), polyacrylonitrile Ethylene glycol (PEG, the mass fraction in the casting solution system is 5%), the nano-silver 4A molecular sieve antibacterial agent prepared by example 1 and the silane coupling agent (KH540) are additives (the mass fraction in the casting solution system is respectively 1% and 1%), prepared as a spinning solution at room temperature. With reference to the spinning process in Example 2, the prepared antibacterial hollow fiber membrane is an asymmetric structure, and the water flux is 200L / m at 0.1MPa operating pressure 2 h, the antibacterial rate against Escherichia coli and Staphylococcus aureus both reached 97%.
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Abstract
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