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Preparation method of highly-anti-fouling polyvinylidene fluoride (PVDF) porous base composite ultrafiltration membrane material

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in ultrafiltration, chemical instruments and methods, and membranes, can solve the problems of easy pollution and low flux of membrane materials, and achieve easy operation, low production cost, and extended use The effect of longevity

Inactive Publication Date: 2019-09-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to provide a new method for preparing a polyvinylidene fluoride metal-organic framework composite ultrafiltration membrane material, and to design and prepare a new type of anti-pollution membrane material integrating porosity and anti-pollution performance, which is helpful for solving the current membrane materials that are easy to pollute and generally Issues such as low volume are of great significance

Method used

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  • Preparation method of highly-anti-fouling polyvinylidene fluoride (PVDF) porous base composite ultrafiltration membrane material
  • Preparation method of highly-anti-fouling polyvinylidene fluoride (PVDF) porous base composite ultrafiltration membrane material
  • Preparation method of highly-anti-fouling polyvinylidene fluoride (PVDF) porous base composite ultrafiltration membrane material

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preparation example Construction

[0030] The embodiment of the present disclosure discloses a preparation method of a polyvinylidene fluoride porous-based composite ultrafiltration membrane material. The preparation method specifically includes the following steps:

[0031] S1) Soak the PVDF membrane in an aqueous solution containing diamino molecular solutes, and set aside;

[0032] S2) adding the transition metal to the aqueous solution containing diamino molecular solute soaked in PVDF membrane prepared in S1), ultrasonically dispersing, and then adding the organic solution containing organic ligands;

[0033] S3) Control the reaction temperature and reaction time; finally, the membrane material is taken out, washed and dried to obtain a polyvinylidene fluoride porous-based composite ultrafiltration membrane material.

[0034] According to an embodiment of the present disclosure, the concentration of the aqueous solution of the diamino molecule solute in S1 is 10% to 40%; the diamino molecule is ethylenedia...

Embodiment example 1

[0044]1) Soak the PVDF membrane in 5 mL of ethylenediamine aqueous solution with a volume concentration of 10% for 2 h, add 2.3 mmol of zinc nitrate tetrahydrate, ultrasonically disperse at 60 kHz for 20 min, and dissolve 0.8 mmol of 2-aminoterephthalic acid In 10 mL of anhydrous N,N dimethylformamide (DMF), pour it into the PVDF membrane reaction solution, ultrasonically disperse for 30 min, and react in an oven at 100 °C for 20 h. Wash with methanol three times, and then dry in an oven at 50 °C for 5 h to obtain PVDF / IRMOF-3 composite ultrafiltration membrane material.

[0045] 2) The prepared PVDF / IRMOF-3 composite ultrafiltration membrane was tested for antifouling performance and tensile strength.

Embodiment example 2

[0047] 1) Soak the PVDF membrane in 5 mL of p-phenylenediamine aqueous solution with a volume concentration of 25% for 2 h, add 4.0 mmol of copper nitrate trihydrate, disperse with 40 kHz ultrasonic for 60 min, and dissolve 2.0 mmol of m-tribenzoic acid in 12 mL of deionized water / ethanol (v:v=1:1) mixed solution, and poured into the PVDF membrane reaction solution, ultrasonically dispersed for 30 min, and reacted in a 60 °C oven for 15 h, and the membrane was taken out after natural cooling, and used The PVDF / CuBTC composite ultrafiltration membrane material was obtained by washing with deionized water and methanol five times, and then drying in an oven at 40 °C for 6 h.

[0048] 2) The antifouling performance test and tensile strength test were carried out on the prepared PVDF / CuBTC composite ultrafiltration membrane.

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Abstract

The invention belongs to the field of composite materials, and relates to a preparation method of a polyvinylidene fluoride (PVDF) porous coordination composite ultrafiltration membrane material. The preparation method is characterized in that transition metal ions are immobilized on a PVDF membrane by using molecules with double amino groups, and the in-situ growth of porous coordination polymers (PCPs) in an organic ligand solution is realized. The preparation method provided by the invention has the advantages that a new method for preparing the PVDF / PCPs composite ultrafiltration membrane material by a one-pot method is developed; PVDF and the PCPs are connected through chemical bonds, and the high-stable ultrafiltration membrane material is formed; by adjusting the types and content of organic ligands and metal source ions in a precursor solution, reaction conditions, and the like, the pore structure, growth amount, and the like of the PCPs can be effectively controlled, thereby achieving the directional regulation and control of membrane properties; the PVDF / PCPs ultrafiltration membrane material prepared by the method integrates porosity and hydrophilicity, the anti-fouling ability of an ultrafiltration membrane is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a polyvinylidene fluoride metal-organic frame composite ultrafiltration membrane material. Background technique [0002] With the development of the economy and the improvement of productivity, the shortage of water resources and water pollution have become increasingly prominent, and it is difficult for traditional water treatment processes to meet water security and solve the problem of sewage reuse. Ultrafiltration is a new type of water treatment membrane technology that uses static pressure difference as the driving force and separates according to the difference in relative molecular mass. It can effectively filter suspended waste, colloids, algae, germs, viruses, etc., thereby achieving The separation and purification of sewage is widely used in the field of water treatment. The core technology of ultrafiltration is membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D69/02B01D67/00B01D61/14C02F1/44
CPCB01D61/145B01D67/0006B01D69/02B01D69/12B01D71/34B01D2323/50B01D2325/02B01D2325/36C02F1/444
Inventor 栾奕李秀娟禹杰赵艳明
Owner UNIV OF SCI & TECH BEIJING
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