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Polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and application thereof

A polyvinylidene fluoride and mixed matrix membrane technology, applied in the field of membrane separation, can solve the problems of polyvinylidene fluoride membrane membrane fouling, etc., achieve the effects of high hydrophilicity, improve self-cleaning ability, and reduce membrane fouling phenomenon

Pending Publication Date: 2021-03-30
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a photocatalytic polyvinylidene fluoride mixed matrix film and its preparation and application in order to overcome the defects of the above-mentioned prior art, which is used to solve the film pollution problem of polyvinylidene fluoride film

Method used

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  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and application thereof
  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and application thereof
  • Polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and application thereof

Examples

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preparation example Construction

[0040] The preparation method of the photocatalytic performance polyvinylidene fluoride mixed matrix film of the self-adhesive method in the present invention comprises the following steps:

[0041] 1) Preparation of casting solution: Add porogens polyvinylpyrrolidone (PVP) and polyvinylidene fluoride (PVDF) to N,N-dimethylacetamide (DMAc) and stir at 30-80°C for 8 -18h, the casting solution was obtained after standing still for defoaming;

[0042] Wherein, the mass ratio of porogen and polyvinylidene fluoride is (0.5-3.5):(14-20);

[0043]2) Preparation of polyvinylidene fluoride mixed matrix membrane by delayed phase inversion method: scrape the casting solution on a glass plate with a thickness of 100-260 μm, and place it in a mixture of ethanol and water at a volume ratio (2.4-3.5): (1.8-2.8) The phase separation is carried out in the gel bath of 14-30 ℃, and the SnO in the gel bath 2 -Cu 2 The amount of O added is 0.1-1.0 g / L to obtain a polyvinylidene fluoride mixed m...

Embodiment 1

[0049] This example is used to prepare polyvinylidene fluoride mixed matrix membrane, and the specific preparation method is as follows:

[0050] 1) Dissolve PVP and PVDF in DMAc at a mass ratio of 2.0:18, and stir at 60°C for 10 hours until fully dissolved, and then stand for degassing for 6 hours to obtain a casting solution;

[0051] 2) Squeegee-coat the casting solution on the glass plate with a thickness of 250 μm;

[0052] 3) Immerse the glass plate with the membrane solution in a mixture of ethanol and deionized water at a volume ratio of 2.8:2.3 at 15°C for phase separation, in which the SnO in the gel bath 2 -Cu 2 O addition amount is 0.5g / L;

[0053] 4) Transfer the phase-separated membrane to soak in deionized water to remove excess solvent, and then store it in clean deionized water to obtain a polyvinylidene fluoride mixed matrix membrane, which is denoted as M1 ultrafiltration membrane.

[0054] The obtained M1 ultrafiltration membrane was characterized by sur...

Embodiment 2

[0056] This example is used to prepare polyvinylidene fluoride mixed matrix membrane, and the specific preparation method is as follows:

[0057] 1) Dissolve PVP and PVDF in DMAc at a mass ratio of 2.5:15, and stir at 70°C for 10 hours until fully dissolved, and then stand for defoaming for 10 hours to obtain a casting solution;

[0058] 2) Squeegee-coat the casting solution on the glass plate with a thickness of 150 μm;

[0059] 3) Immerse the glass plate with the film solution in a mixture of ethanol and deionized water at a volume ratio of 3.2:2.5 at 20°C for phase separation, in which the SnO in the gel bath 2 -Cu 2 O addition amount is 0.7g / L;

[0060] 4) Transfer the phase-separated membrane to soak in deionized water to remove excess solvent, and then store it in clean deionized water to obtain a polyvinylidene fluoride mixed matrix membrane, which is designated as an M2 ultrafiltration membrane.

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Abstract

The invention relates to a polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and an application thereof. A preparation method comprises the followingsteps: preparing a membrane casting solution from polyvinylidene fluoride, and blade-coating the membrane casting solution on a substrate; and putting the substrate with the membrane casting solutioninto a gel bath in which SnO2-Cu2O is dispersed, and realizing adhesion of SnO2-Cu2O on the surface of the matrix membrane through a delayed phase conversion process to obtain the polyvinylidene fluoride mixed matrix membrane. Compared with the prior art, the PVDF ultrafiltration membrane adhered with the SnO2-Cu2O photocatalyst prepared by the invention has higher hydrophilicity and remarkable photocatalytic performance compared with the traditional PVDF ultrafiltration membrane; Cu2O and SnO2 are combined to form a heterojunction structure, the photo-corrosion phenomenon of SnO2 is avoidedwhile the photo-response performance of Cu2O and SnO2 is improved, the electron transmission rate of Cu2O is increased due to addition of Cu2O, the visible light response capacity of SnO2-Cu2O is effectively promoted, the good anti-pollution effect is achieved under visible light irradiation, the membrane pollution phenomenon can be effectively reduced, and the reduction rate of the membrane fluxis reduced.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a polyvinylidene fluoride mixed matrix membrane with photocatalytic performance and its preparation and application. Background technique [0002] Membrane separation technology is one of the preferred technologies in the field of water pollution control engineering. Due to its low cost, good effluent quality, high degree of intensification, simple equipment, and convenient operation, it is widely used in drinking water purification, sewage treatment and reuse. . [0003] However, membrane fouling, especially organic pollution, often leads to attenuation of membrane flux, increase of operating cost and shortening of membrane service life, thus becoming the main obstacle to the widespread application of membrane separation technology in drinking water, sewage and wastewater treatment, and also Technical problems that need to be solved urgently. [0004] Polyvinyliden...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D65/02B01D61/14C02F1/44C02F101/30
CPCB01D71/34B01D71/024B01D69/02B01D67/0079B01D61/145B01D65/02C02F1/444B01D2325/10B01D2325/36C02F2101/30B01D2321/34
Inventor 陈桂娥陈镇谢焕银李怡静万佳俊刘连静汪洋许振良
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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