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Preparation method of PAN-based oil-water separation microporous membrane with photocatalysis function

A technology of oil-water separation and microporous membrane, which is applied in the field of membrane materials, can solve the problems of poor porosity, poor permeability, and low specific surface area of ​​membrane materials, and achieve high porosity, high loading rate, and large specific surface area. Effect

Active Publication Date: 2020-03-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as poor porosity of the membrane material, low specific surface area, and poor permeability of the membrane after blending.

Method used

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  • Preparation method of PAN-based oil-water separation microporous membrane with photocatalysis function
  • Preparation method of PAN-based oil-water separation microporous membrane with photocatalysis function
  • Preparation method of PAN-based oil-water separation microporous membrane with photocatalysis function

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preparation example Construction

[0024] The invention provides a kind of preparation method (abbreviation method) of the PAN-based oil-water separation microporous membrane with photocatalytic function, it is characterized in that the method comprises the following steps:

[0025] 1)SiO2 2 @TiO 2 Preparation of additives: at room temperature (10-35°C), add TiO 2 The particles are dispersed evenly in ethanol by ultrasonic, and ammonia water and deionized water are added at the same time to obtain TiO 2 Mixed solution; ammonia and TiO 2 The mass ratio of particles is 3 to 5:1; deionized water and TiO 2 The mass ratio of particles is 60:1; TiO 2 Ethanol and TiO in the mixture 2 The mass ratio of particles is 100:0.5;

[0026] Dissolve TEOS (tetraethyl orthosilicate) in ethanol to obtain TEOS solution; TEOS and TiO 2 The mass ratio of particles is 2-4:1; the mass ratio of ethanol to TEOS in TEOS solution is 100:5;

[0027] TiO 2 Move the mixed solution into an environment (water bath) at 25-35°C, add TEO...

Embodiment 1

[0038] (1) Preparation of SiO by sol-gel method 2 @TiO 2 Additive: 150mg of TiO 2 Add 40mL ethanol to ultrasonic dispersion for 2h, add 15mL ammonia water and 10mL deionized water; dissolve 4.3mL tetraethyl orthosilicate in 20mL ethanol; 2 The mixed solution was transferred to a hydrothermal kettle for constant temperature reaction for 2 hours. During the reaction, the TEOS solution was gradually added dropwise. The reaction temperature was 25-35°C. Then the product was washed with ethanol and deionized water until it was neutral, and finally dried at 60°C. Get SiO 2 @TiO 2 additive;

[0039] (2) Contains SiO 2 @TiO 2 The preparation of the P(AN-MA) microporous membrane of the additive: 5.1g caprolactam, 5.1g triacetin, 1.8g polyacrylonitrile methyl acrylate and 0.1g above-mentioned SiO 2 @TiO 2 The additive was added to a 100mL flask, ultrasonically dispersed in a water bath for 90 minutes to obtain a uniform mixed solution, heated and stirred for 90 minutes under the...

Embodiment 3

[0062] (1) Preparation of SiO by sol-gel method 2 @TiO 2 Additive: 150mg of TiO 2 Add 40mL ethanol to ultrasonic dispersion for 2h, add 15mL ammonia water and 10mL deionized water; dissolve 4.3mL tetraethyl orthosilicate in 20mL ethanol; 2 The mixed solution was transferred into a hydrothermal kettle for constant temperature reaction for 3 hours. During the reaction, the TEOS solution was gradually added dropwise. The reaction temperature was 25-35°C. Then the product was washed with ethanol and deionized water until neutral, and finally dried at 60°C. Get SiO 2 @TiO 2 additive;

[0063] (2) Contains SiO 2 @TiO 2 The preparation of the P(AN-MA) microporous membrane of the additive: 4.7g caprolactam, 4.7g glycerol triacetate, 2.4g polyacrylonitrile methyl acrylate and 0.1g above-mentioned SiO 2 @TiO 2 Add the additive into a 100mL flask, and then ultrasonically disperse it in a water bath ultrasonic for 95min to obtain a uniform mixed solution, heat and stir for 90min u...

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Abstract

The invention discloses a preparation method of a PAN-based oil-water separation microporous membrane with a photocatalysis function. The preparation method comprises the following steps: firstly, introducing shell-layer SiO2 nanoparticles onto the outer surface of TiO2 by adopting a sol-gel method to realize coating of nanometer TiO2 with a photocatalysis function so as to obtain a SiO2@TiO2 additive, thereby isolating direct contact between a base membrane and photocatalysis particles and laying a foundation for migration of the photocatalysis particles to the surface of the membrane in thenext step; then blending SiO2@TiO2 and P(AN-MA) to prepare a membrane casting solution; curing the membrane casting solution containing the SiO2@TiO2 additive by using a TIPS method so as to form a membrane; then, subjecting the cured membrane to a hydrolysis reaction so as to convert cyano groups on the surface of the membrane into hydrophilic carboxyl groups; and dissolving the additive shell-layer SiO2, and allowing TiO2 in the additive to break away from constraint and migrate to the surface of the membrane so as to achieve the purpose of efficiently utilizing the photocatalysis particleswithout damaging the original performance of the base membrane, thereby obtaining the PAN-based microporous membrane with an oil-water separation function and photocatalytic degradation performance. The method has the advantages of simple process, high efficiency, no pollution and no influence on the permeability of the base membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, in particular to a preparation method of a PAN-based oil-water separation microporous membrane with a photocatalytic function. Background technique [0002] At present, as a large textile country, my country has many printing and dyeing factories, wool dyeing factories and silk factories mainly processing cotton, linen, chemical fibers and their blended products, and silk, and a large amount of printing and dyeing wastewater is discharged every day. The water quality of printing and dyeing wastewater changes complexly and violently, and its color is deep, the pH value changes greatly, the biochemical properties are poor, and it contains a large number of organic pollutants such as aniline, nitrobenzene, o- Phthalic acid, etc. Most of these substances are carcinogens and are difficult to be naturally degraded by microorganisms in nature. Traditional printing and dyeing wastewater trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D67/00C02F1/44C02F1/30B01J31/38B01J35/06C02F103/30
CPCB01D71/42B01D67/0079C02F1/44C02F1/30B01J31/38B01J23/002C02F2103/30B01J35/23B01J35/59B01J35/39
Inventor 韩娜张浩然张龙飞张兴祥张总宣钱勇强
Owner TIANJIN POLYTECHNIC UNIV
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