Preparation method of PVDF membrane with catalytic self-cleaning function

A self-cleaning and functional technology, applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of reducing the modification effect and failing to achieve it, and achieve the improvement of hydrophilicity, pollution resistance, and permeability. amount of effect

Active Publication Date: 2018-07-06
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is aimed at the problem that modifiers are agglomerated or eluted during the film preparation process in the current blending modification method, thus failing to achieve or reduce the modification effect, and proposes a graft-coordination technology that will have A metal phthalocyanine catalyst with catalytic function and stable chemical properties was grafted onto the surface of PVDF powder, and then doped into PVDF powder in a certain proportion to prepare a PVDF composite membrane with anti-pollution and catalytic self-cleaning functions

Method used

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  • Preparation method of PVDF membrane with catalytic self-cleaning function
  • Preparation method of PVDF membrane with catalytic self-cleaning function
  • Preparation method of PVDF membrane with catalytic self-cleaning function

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Effect test

Embodiment 1

[0029] Step 1. Add the PVDF powder without modifier into the casting film solvent, stir at 60°C until completely dissolved, and keep stirring at 60°C for 12 hours, then defoam under negative pressure for 6 hours, and use an automatic film scraping machine The casting solution is evenly coated on the polyester non-woven fabric, and the scraped film is left to stand in the air for 30 seconds, and then put into deionized water at a temperature of 35°C to obtain a PVDF original film.

Embodiment 2

[0031] Step 1. Disperse 6g of PVDF powder into 300mL of 10wt% potassium hydroxide aqueous solution, add 30mL of 95% ethanol during the dispersion process, and stir while adding until the powder is completely wet; then stir at 70°C for 30min, filter and wash Several times, vacuum drying at 60°C to obtain light yellow alkalized PVDF powder;

[0032] Step 2. Disperse 5g of the PVDF powder obtained in step 1 into an aqueous solution of 1wt% sodium bicarbonate, and then add a certain amount of 3g of 4-aminopyridine dropwise during vigorous stirring at 120°C; Stirring was continued for 4 hours, and vacuum drying was carried out at 60° C. to obtain reddish-brown PVDF powder grafted with 4-aminopyridine;

[0033] Step 3. Disperse 3 g of the PVDF powder obtained in step 2 into tetrahydrofuran, then add dropwise the tetrahydrofuran solution in which metal phthalocyanine is dissolved (dissolve 0.3 g of iron phthalocyanine in 50 ml of tetrahydrofuran), after the dropwise addition is compl...

Embodiment 3

[0037] 2wt% modifier was doped into PVDF powder to prepare PVDF composite membrane, and the anti-fouling and catalytic self-cleaning properties of the membrane were investigated.

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Abstract

The invention relates to the technical field of membrane separation materials, and particularly relates to a preparation method of a polyvinylidene fluoride (PVDF) membrane with a catalytic self-cleaning function. According to the preparation method provided by the invention, 4-amino pyridine is grafted onto the main chain of PVDF by covalent bonds, then metal phthalocyanine is axially coordinatedthrough N elements on pyridine rings, and a Fenton-like modifier is prepared. The modifier is blended with PVDF powder, and the PVDF composite membrane is prepared by a non-solvent induced phase inversion technology. According to the composite film prepared by the method, the hydrophilicity, the pore diameter, the voidage and the negative charge of the PVDF membrane are improved, the permeabilityflux and the pollution resistance of the PVDF membrane are improved, and moreover, the PVDF membrane is endowed with a catalytic self-cleaning capability.

Description

Technical field [0001] The patent of the invention relates to the technical field of membrane separation materials, specifically a method for preparing a PVDF membrane with catalytic self-cleaning function. Background technique [0002] Polyvinylidene fluoride (PVDF) is a polymer material with excellent weather resistance, heat resistance, acid and alkali resistance, easy control of film forming process conditions and good mechanical properties. Therefore, it is widely used in the preparation of ultrafiltration membranes. However, the PVDF material itself has low surface energy and strong hydrophobicity, which leads to problems in the water treatment process of PVDF membranes: in the membrane bioreactor process or the oil / water system separation process, organic pollutants such as protein or oil are easily adsorbed. On the surface of the membrane or in the pores of the membrane, serious membrane fouling is caused. In turn, the permeation flux of the membrane is reduced, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02
CPCB01D67/0006B01D69/02B01D71/34B01D2325/24B01D2325/36
Inventor 陈锋涛陈文兴
Owner ZHEJIANG SCI-TECH UNIV
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