Preparation method of photocatalytic composite porous membrane

A porous membrane and photocatalytic technology, applied in the field of membrane materials, can solve problems such as limited effect, membrane pollution, and inability to degrade pollutants

Active Publication Date: 2021-12-07
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, in the process of wastewater treatment, the existing polyethersulfone membrane separation technology has serious membrane fouling and pollutants cannot be degraded, while the photocatalytic technology has the problem of difficult recovery of powdered photocatalysts.
The photocatalytic separation membrane that combines photocatalytic technology with membrane separation technology is only suitable for cross-flow filtration process, which makes the role of photocatalytic membrane pollution mitigation very limited.

Method used

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  • Preparation method of photocatalytic composite porous membrane
  • Preparation method of photocatalytic composite porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]A preparation method of a photocatalytic composite porous membrane, comprising the following steps:

[0024] 1) Preparation of polyethersulfone porous base membrane: Mix 13wt.% polyethersulfone, 10wt.% polyvinylpyrrolidone and 77wt.% dimethylacetamide, heat to 75°C in a water bath and continue to stir for 6h, then scrape and coat. The film is cured in a deionized water coagulation bath, and the porous film I is obtained after drying at room temperature;

[0025] 2) The porous membrane I obtained in step 1) is immersed in 0.1M cadmium chloride solution, deionized water, 0.1M ammonium sulfide solution, deionized water successively, and a dipping cycle is completed, which is called cycle A. A was repeated 10 times to synthesize cadmium sulfide on the surface of porous film I to obtain porous film II;

[0026] 3) The porous membrane II obtained in step 2) was immersed in a 0.1M ferric nitrate solution for 2 minutes, and then immersed in a 0.1M pyrrole solution for 2 minutes...

Embodiment 2

[0029] 1) Preparation of polyethersulfone porous base film: Mix 15wt.% polyethersulfone, 10wt.% polyvinylpyrrolidone and 75wt.% dimethylacetamide, heat to 75°C in a water bath and continue stirring for 6h, scrape and coat The film is cured in a deionized water coagulation bath, and the porous film I is obtained after drying at room temperature;

[0030] 2) The porous membrane I obtained in step 1) is immersed in 0.1M cadmium chloride solution, deionized water, 0.1M ammonium sulfide solution, deionized water successively, and a dipping cycle is completed, which is called cycle A. A was repeated 10 times to synthesize cadmium sulfide on the surface of porous film I to obtain porous film II;

[0031] 3) The porous membrane II obtained in step 2) was immersed in a 0.1M ferric nitrate solution for 2 minutes, and then immersed in a 0.1M pyrrole solution for 2 minutes to synthesize polypyrrole to obtain a photocatalytic composite porous membrane.

[0032] In this example, the produc...

Embodiment 3

[0034] 1) Preparation of polyethersulfone porous base membrane: Mix 13wt.% polyethersulfone, 10wt.% polyvinylpyrrolidone and 77wt.% dimethylacetamide, heat to 75°C in a water bath and continue to stir for 6h, then scrape and coat. The film is cured in a deionized water coagulation bath, and the porous film I is obtained after drying at room temperature;

[0035] 2) the porous membrane I obtained in step 1) is successively dipped in 0.1M cadmium nitrate solution, deionized water, 0.1M ammonium sulfide solution, deionized water to complete a dipping cycle, called cycle A, and cycle A is Repeat 10 times to synthesize cadmium sulfide on the surface of porous membrane I to obtain porous membrane II;

[0036] 3) The porous membrane II obtained in step 2) was immersed in a 0.1M ferric nitrate solution for 2 minutes, and then immersed in a 0.1M pyrrole solution for 2 minutes to synthesize polypyrrole to obtain a photocatalytic composite porous membrane.

[0037] In this example, the ...

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Abstract

The invention discloses a preparation method of a photocatalytic composite porous membrane, the preparation method comprises the following steps: 1) adding polyethersulfone and a pore-foaming agent into an organic solvent, mixing, heating to 40-80 DEG C, continuously stirring for 2-7 hours to obtain a membrane casting solution, blade-coating, curing in coagulating bath water to form a membrane, and drying at room temperature to obtain a polyethersulfone porous membrane; 2) sequentially dipping the obtained polyether sulfone porous membrane in a cadmium ion solution, deionized water, a sulfur ion solution and deionized water to complete a dipping cycle, namely cycle A, repeating the cycle A for a plurality of times, and synthesizing cadmium sulfide on the surface of the polyether sulfone porous membrane to obtain a polyether sulfone / cadmium sulfide porous membrane; and 3) dipping the obtained polyethersulfone / cadmium sulfide porous membrane in an iron ion solution, and then dipping in pyrrole to synthesize polypyrrole, thereby obtaining the photocatalytic composite porous membrane. The photocatalytic composite porous membrane can realize dynamic degradation of pollutants in water with high water flux, overcomes the problem of membrane pollution generated during continuous dead-end filtration, and is low in operation cost and wide in application prospect.

Description

technical field [0001] The invention belongs to the field of membrane materials, in particular to the preparation of a photocatalytic composite porous membrane which has both separation function and photocatalytic degradation of organic matter. Background technique [0002] With the increasing discharge of wastewater, the problem of organic wastewater pollution is becoming more and more serious, which brings great challenges to the living environment of human beings, and wastewater treatment has received more and more attention. Organic wastewater treatment methods include separation methods and conversion methods. Membrane separation technology using membrane materials for wastewater treatment is a kind of separation method. The traditional membrane separation technology uses the selective permeability of the membrane to separate the pollutants in the water, and adjusts the pore size and surface properties of the membrane material to improve the separation performance. Pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00C02F1/30C02F1/44B01J31/06B01J35/06C02F101/30
CPCB01D71/68B01D67/0079C02F1/30C02F1/44B01J31/069B01J35/065B01J35/004B01J35/1004C02F2101/308C02F2305/10
Inventor 赵健田圣男石海婷朴洪伟权全肖长发
Owner TIANJIN POLYTECHNIC UNIV
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