Polydopamine synergistic nanoparticle modified PVDF (Polyvinylidene Fluoride) membrane and preparation method thereof

A nanoparticle modification, polydopamine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor PVDF membrane structure, non-hydrophilic membrane surface, easy to be polluted, etc. The effect of hydrophilicity, improving membrane pore structure, and improving pore structure

Pending Publication Date: 2022-04-15
XI'AN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0006] The object of the present invention provides a kind of preparation method of the PVDF film that polydopamine synergistic nanoparticle is modified, by combining polydopamine and nanoparticle, modulate the structure and surface characteristic of PVDF ultrafiltration membrane, solve PVDF membrane structure poor, Low strength, non-hydrophilic membrane surface, low rejection rate and easy contamination

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  • Polydopamine synergistic nanoparticle modified PVDF (Polyvinylidene Fluoride) membrane and preparation method thereof
  • Polydopamine synergistic nanoparticle modified PVDF (Polyvinylidene Fluoride) membrane and preparation method thereof
  • Polydopamine synergistic nanoparticle modified PVDF (Polyvinylidene Fluoride) membrane and preparation method thereof

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[0036] The embodiment of the present invention discloses a method for preparing a PVDF membrane modified by polydopamine synergistically with nanoparticles, comprising the following steps:

[0037] Preparation of inorganic nanoparticles;

[0038] Preparation of the buffer solution: prepare the Tris solution and the dilute acid solution respectively, and mix the Tris solution and the dilute acid solution evenly to obtain the buffer solution;

[0039] Preparation of modified solution: adding inorganic nanoparticles and dopamine into the buffer solution, stirring evenly to obtain modified solution;

[0040] Preparation of modifier: Grinding the solid obtained after drying the modified solution to obtain polydopamine powder doped with nanoparticles;

[0041] Preparation of casting solution: dissolving polyvinylidene fluoride and porogen in an organic solvent, stirring evenly, then adding a certain amount of polydopamine powder doped with nanoparticles, heating and stirring evenly...

Embodiment 1

[0052] A method for preparing polydopamine synergistically modified PVDF membrane with nano zinc oxide, the specific steps are as follows:

[0053] 1) Weigh 20g of zinc chloride, dissolve it in 250mL of deionized water, weigh 10g of ammonium bicarbonate and dissolve it in it, add dilute hydrochloric acid dropwise to adjust the pH to about 9, filter the white precipitate obtained by the reaction, and use 0.2% carbonic acid Washing and drying with sodium hydrogen solution, calcining and grinding in a muffle furnace to obtain ultra-pure nano-zinc oxide, the temperature of the muffle furnace calcining is 600°C, and the heating rate is 1°C·min -1 , The calcination time is 4h.

[0054] 2) Prepare 0.01mol / L Tris solution;

[0055] 3) prepare 0.01mol / L hydrochloric acid solution;

[0056] 4) Mix the tris solution obtained in step 2 and the hydrochloric acid solution obtained in step 3 to obtain a buffer solution, and adjust the pH to 7.5 with a pH meter;

[0057] 5) Add dopamine an...

Embodiment 2

[0065] Step 1~step 6 and step 8 are the same as embodiment 1;

[0066] Step 7) Prepare a solution of polyvinylidene fluoride, polyvinylpyrrolidone, and N,N dimethylacetamide at a mass ratio of 15:1:84, stir for 4 hours under the condition of 200r / min, and then add the mass fraction to account for 1 % polydopamine doped with nano-ZnO to obtain casting solution.

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Abstract

The invention relates to the technical field of membrane separation materials, in particular to a preparation method of a PVDF (Polyvinylidene Fluoride) membrane modified by cooperation of polydopamine and nanoparticles. According to the preparation method disclosed by the invention, the adhesion effect of the polydopamine is utilized, the pure nanoparticles are doped onto the polydopamine, then the polydopamine doped with the nanoparticles is used for modifying the PVDF membrane, the hydrophilicity of the surface of the PVDF membrane is modified through the polydopamine, the pore channel structure of the PVDF membrane can be improved through the nanoparticles, and the anti-pollution capacity and the mechanical strength of the membrane are improved; therefore, the modified PVDF membrane has good hydrophilicity and pollution resistance. The PVDF modified membrane is adopted to treat sewage, so that membrane pollution and environmental pollution can be reduced, water resources are recycled, and meanwhile, the PVDF modified membrane has great significance in carbon neutralization.

Description

technical field [0001] The invention relates to the technical field of membrane separation materials, in particular to a PVDF membrane modified with polydopamine and nanoparticles and a preparation method thereof. Background technique [0002] Water shortage is considered to be one of the most serious problems in the 21st century, and the contradiction between increasing water demand and decreasing water supply is particularly urgent. However, at the same time as water resources are in short supply, various point and non-point source pollutions have caused water quality to continue to decline, and water environmental pollution has aggravated, leading to a reduction in the available portion of water resources and increasing the difficulty of reuse. This will seriously affect the sustainable development of social economy and threaten the drinking water safety and health of the people. This has just constantly led to people's research on green water treatment methods with exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/06B01D71/02B01D67/00C02F1/44
Inventor 杨靖袁傲
Owner XI'AN POLYTECHNIC UNIVERSITY
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