Method for preparing rare earth modified polyvinylidene fluoride hollow fiber membrane
A polyvinylidene fluoride and rare earth modification technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problem of low surface energy of polyvinylidene fluoride membranes, reduced water flux and separation performance, and reduced effective life, etc. problems, to achieve the effect of strong anti-pollution, easy access, and enhanced hydrophilicity
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Embodiment 1
[0036] A method for preparing rare earth lanthanum nanoparticles modified polyvinylidene fluoride hollow fiber membrane, comprising the steps of:
[0037] (1) Preparation of rare earth lanthanum nano-solution: weigh 0.055g lanthanum nitrate hexahydrate (LaNO 3 ·6H 2 0), add 10mL of absolute ethanol, 1mL of concentrated hydrochloric acid and 2mL of deionized water in turn, fully stir to form a uniform and transparent solution A; pipette 10mL of silane coupling agent and slowly drop it into 15mL of absolute ethanol, and the dropwise addition is completed Then react at 25°C for 1 hour to obtain a clear solution B; then slowly drop solution A into solution B, continue stirring to obtain a wet gel of lanthanum-doped silica nanoparticles, and add the obtained wet gel to anhydrous Ultrasonic treatment in ethanol, and then drying to prepare modified rare earth lanthanum nanoparticles; weigh a certain amount of modified rare earth lanthanum nanoparticles, sodium lauryl sulfate, add a ...
Embodiment 2
[0043] A method for preparing rare earth ytterbium nanoparticles modified polyvinylidene fluoride hollow fiber membrane, comprising the steps of:
[0044] (1) Preparation of rare earth ytterbium nano-solution: Weigh 0.093g of ytterbium oxide, add 12mL of absolute ethanol, 2mL of concentrated hydrochloric acid and 2mL of deionized water in sequence, stir well to make a uniform and transparent solution A, and set aside; pipette 10mL of silane Slowly drop the coupling agent into 20mL of absolute ethanol. After the dropwise addition, react at 30°C for 1 hour to obtain a clear solution B; then slowly drop solution A into solution B, and continue stirring to obtain ytterbium-doped silica The wet gel of nanoparticles, the obtained wet gel is added to absolute ethanol for ultrasonic treatment, and then dried to obtain modified rare earth ytterbium nanoparticles, and a certain amount of modified rare earth ytterbium nanoparticles, dodecyl Sodium sulfate, add a small amount of dispersan...
Embodiment 3
[0049] A method for preparing rare earth cerium nanoparticles modified polyvinylidene fluoride hollow fiber membrane, comprising the steps of:
[0050] (1) Preparation of rare earth cerium nano-solution: Treat cerium nitrate hexahydrate (CeNO 3 ·6H 2 O) to prepare modified rare earth cerium nanoparticles. Weigh a certain amount of modified rare earth cerium nanoparticles, sodium lauryl sulfate, a small amount of dispersant N,N-dimethylformamide (DMF), heat and stir to make the modified rare earth cerium nanoparticles evenly dispersed in DMF, Obtain rare earth cerium titanium nanometer solution;
[0051] (2) Preparation of casting solution: Add polyvinylidene fluoride (PVDF6020), porogen polyethylene glycol (PEG, Mn10000) to the rare earth cerium nano solution prepared in step (1), supplementary dispersant N, N- Dimethylformamide (DMF), was stirred under 60 ℃ of water bath conditions for 24h, was made into uniform film casting liquid; In the film casting liquid: the mass per...
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