Zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane and application thereof

A technology of zeolite molecular sieve and chitosan, applied in ultrafiltration, membrane, membrane technology, etc., can solve the problems of strong hydrophobicity, weak antifouling ability, low water flux of PVDF fiber membrane, etc., and achieve good hydrophilicity, Effects of low weight, promoting water flux performance and antifouling performance

CN110694490AInactive Publication Date: 2020-01-17SOUTH CHINA AGRI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-01-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of ultrafiltration materials, and in particular relates to a zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane. The composite ultrafiltrationmembrane is prepared by the method including the following steps: mixing polyvinylidene fluoride, a binary solvent, polyvinylpyrrolidone and nanozeolite according a certain ration to prepare a precursor solution, performing electrostatic spinning to obtain nano composite fibers, and performing coating by using a chitosan layer to obtain the composite ultrafiltration membrane. The composite ultrafiltration membrane provided by the invention has good hydrophilicity and water resistance and better mechanical properties, the chitosan coating can promote water flux performance and antifouling performance of the composite ultrafiltration membrane by increasing wettability and porosity, and the prepared hybrid ultrafiltration membrane has very high potential in the field of water purification.
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Description

technical field

[0001] The invention belongs to the field of ultrafiltration materials, in particular to a zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane and its application. Background technique

[0002] In recent years, electrospinning technology has attracted widespread attention in the scientific research community, because the nanofibrous membranes prepared by electrospinning have many important characteristics, such as high porosity, small pore size, low weight, high surface area to volume ratio, and high permeability. , with potential future applications in the field of water filtration. Generally, an ideal filtration membrane must have high permeability, good hydrophilicity, mechanical properties, and excellent chemical resistance, while high surface porosity and good pore structure of the membrane are crucial to obtain high permeability. However, an obvious drawback of electrospun fiber membranes is that their mechanical properties are muc...

Examples

Embodiment 1

[0024] A preparation method of zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane, comprising the following steps:

[0025] (1) Mix 1.0g of dimethylacetamide and 3.6g of acetone to make a binary solvent (the weight ratio of the two is 1:3.6), stir in a glass bottle with a cover for 1h at a stirring speed of 200r / min, and then separate Add 0.015g of polyvinylpyrrolidone and 0.015g of nano-zeolite particles, stir evenly for 1h to obtain a mixed solution; add 1.5g of PVDF powder to the above solution and mix, stir in a water bath at 80°C until the powder is completely dissolved, put it into an ultrasonic instrument and continue to sonicate for 6h , to obtain the electrospinning precursor solution.

[0026] (2) Place the electrospinning precursor solution above under a high-voltage electrostatic field for electrospinning to obtain nanocomposite fibers with 1.0% nanometer zeolite. Calculation method of nano zeolite content: m 纳米沸石 / m 溶质总质量 , the total mass ...

Embodiment 2

[0031] A preparation method of zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane, comprising the following steps:

[0032] (1) Mix 1.0g of dimethylacetamide and 3.6g of acetone to make a binary solvent (the weight ratio of the two is 1:3.6), stir in a glass bottle with a cover for 1h at a stirring speed of 200r / min, and then separate Add 0.048g polyvinylpyrrolidone and 0.048g nano-zeolite particles, stir evenly for 1 hour to obtain a mixed solution; add 1.5g PVDF powder to the above solution and mix, stir in a water bath at 60°C until the powder is completely dissolved, put it into an ultrasonic instrument and continue to sonicate for 8 hours, Obtain electrospinning precursor solution.

[0033] (2) Place the electrospinning precursor solution above under a high-voltage electrostatic field for electrospinning to obtain nanocomposite fibers with 3.0% nanometer zeolite.

[0034] Put the homogeneously mixed electrospinning precursor solution prepared above ...

Embodiment 3

[0038] A preparation method of zeolite molecular sieve-PVDF-chitosan composite ultrafiltration membrane, comprising the following steps:

[0039](1) Mix 1.0g dimethylacetamide and 3.2g acetone to make a binary solvent (the weight ratio of the two is 1:3.2), stir in a glass bottle with a cover for 1h at a stirring speed of 350r / min, and then separate Add 0.083g of polyvinylpyrrolidone and 0.083g of nano-zeolite particles, stir for 1 hour to obtain a mixed solution; add 1.5g of PVDF powder to the above solution and mix, stir in a water bath at 50°C until the powder is completely dissolved, and put it into an ultrasonic instrument for continuous ultrasonication for 6 hours. Obtain electrospinning precursor solution.

[0040] (2) Place the electrospinning precursor solution above under a high-voltage electrostatic field for electrospinning to obtain nanocomposite fibers with 5.0% nanometer zeolite.

[0041] Put the homogeneously mixed electrospinning precursor solution prepared a...