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Anti-pollution photocatalytic degradation blended membrane

A technology of blended membrane and photocatalysis, which is applied in the direction of water pollutants, membrane, membrane technology, etc., can solve the problems of PVDF membrane strength, poor anti-pollution, small addition of inorganic nanoparticles, and reduced stability of casting solution. , to achieve the effects of easy large-scale processing, improved blending stability, and increased strength

Inactive Publication Date: 2020-02-14
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyvinylidene fluoride (PVDF) has the characteristics of excellent thermal stability, aging resistance and low price, so PVDF membranes stand out among many membranes and are widely used in the field of wastewater treatment, but the strength and pollution resistance of PVDF membranes are poor. Poor, which limits its large-scale industrial application
[0004] In order to improve the strength and pollution resistance of PVDF membranes, many researchers adopt the method of blending inorganic nanoparticles, which can be compatible with the advantages of organic matrix and inorganic particles, but there are small additions of inorganic nanoparticles and the limitation of casting liquid. Defects such as reduced stability and easy peeling of inorganic particles in the film during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example shows a MWCNTS-ZnO / PVDF blend membrane with high hydrophilic self-cleaning properties. The specific implementation steps are as follows:

[0029] (1) Dissolve PVDF in TEP at 180°C to form a PVDF casting solution;

[0030] (2) adding zinc oxide (ZnO) and carboxylated carbon nanotubes (MWCNTS) into the diluent respectively and performing ultrasonic treatment for 30min to obtain MWCNTS mixed solution (A) and ZnO mixed solution (B);

[0031] (3) Add A and B in turn to the PVDF casting solution and stir for 6 hours;

[0032] (4) In PVDF casting solution, MWCNTS and ZnO react to obtain MWCNTS-ZnO composite;

[0033] (5) Scrape-coat the casting solution obtained in step (4) on a glass plate under an atmosphere of 190° C.;

[0034] (6) Put the glass plate with the casting solution obtained in step (5) into a water coagulation bath at 0° C. and prepare the MWCNTS-ZnO / PVDF blend film by thermal phase inversion method;

[0035] (7) Measure the MWCNTS-ZnO / PVDF blend...

Embodiment 2

[0039] This example shows a MWCNTS-ZnO / PVDF blend membrane with high hydrophilic self-cleaning properties. The specific implementation steps are as follows:

[0040] (1) Dissolve PVDF in TEP at 190°C to form a PVDF casting solution;

[0041] (2) adding zinc oxide (ZnO) and carboxylated carbon nanotubes (MWCNTS) into the diluent respectively and performing ultrasonic treatment for 30min to obtain MWCNTS mixed solution (A) and ZnO mixed solution (B);

[0042] (3) Add A and B in turn to the PVDF casting solution and stir for 6 hours;

[0043] (4) In PVDF casting solution, MWCNTS and ZnO react to obtain MWCNTS-ZnO composite;

[0044] (5) Scrape-coat the casting solution obtained in step (4) on a glass plate under an atmosphere of 200° C.;

[0045] (6) Put the glass plate with the casting liquid that step (5) obtains into the water coagulation bath of 40 DEG C and prepare MWCNTS-ZnO / PVDF blend film by thermal phase inversion method;

[0046] (7) Measure the MWCNTS-ZnO / PVDF blend...

Embodiment 3

[0050] This example shows a MWCNTS-ZnO / PVDF blend membrane with high hydrophilic self-cleaning properties. The specific implementation steps are as follows:

[0051] (1) Dissolve PVDF in TEP at 200°C to form a PVDF casting solution;

[0052] (2) adding zinc oxide (ZnO) and carboxylated carbon nanotubes (MWCNTS) into the diluent respectively and performing ultrasonic treatment for 30min to obtain MWCNTS mixed solution (A) and ZnO mixed solution (B);

[0053] (3) Add A and B in turn to the PVDF casting solution and stir for 6 hours;

[0054] (4) In PVDF casting solution, MWCNTS and ZnO react to obtain MWCNTS-ZnO composite;

[0055](5) The casting solution obtained in step (4) is scraped and coated on a glass plate under an atmosphere of 210° C.;

[0056] (6) Put the glass plate with the casting liquid that step (5) obtains into the water coagulation bath of 80 DEG C and prepare the MWCNTS-ZnO / PVDF blend film by thermal phase inversion method;

[0057] (7) Measure the MWCNTS-Z...

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Abstract

The invention discloses an anti-pollution photocatalytic degradation blended membrane. The preparation steps include: dissolving polyvinylidene fluoride (PVDF) in a diluent at a high temperature to form a PVDF transparent solution; respectively adding zinc oxide (ZnO) and carboxylated carbon nanotubes (MWCNTS) into a diluent, and carrying out ultrasonic treatment to obtain an MWCNTS mixed solution(A) and a ZnO mixed solution (B); sequentially adding A and B into the PVDF membrane casting solution, stirring the substances uniformly, and carrying out in-situ reaction on the MWCNTS and ZnO to generate an MWCNTS-ZnO compound; and preparing an MWCNTS-ZnO / PVDF blended membrane by thermally induced phase inversion method. The MWCNTS-ZnO / PVDF blended membrane is stable in structure and high in strength, has the advantages of photodegradation, self-cleaning and pollution resistance, and is suitable for large-scale treatment of dye wastewater.

Description

technical field [0001] The invention relates to the technical field of separation membrane manufacturing for water treatment, in particular to an anti-pollution photocatalytic degradation blend membrane. Background technique [0002] Dye wastewater is one of the key pollution sources of the environment. It has many characteristics such as huge discharge, complex composition, high organic pollution, high concentration of pollutants, large chroma, poor biochemical properties, and large changes in water quality. It has become a difficult problem in wastewater treatment. With the promulgation and implementation of GB4287-2012 "Water Pollutant Discharge Standards for Textile Dyeing and Finishing Industry", the Ministry of Environmental Protection put forward the slogan of "zero discharge" of industrial wastewater, and successively introduced measures such as industrial upgrading, water price increase and total discharge control, requiring dyestuff manufacturing Enterprises such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/34C02F1/30C02F1/44C02F101/30
CPCB01D67/0002B01D69/02B01D71/34B01D2325/36C02F1/30C02F1/44C02F2101/308C02F2305/10
Inventor 王薇孙函舒
Owner TIANJIN POLYTECHNIC UNIV
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