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A kind of preparation method of polyvinylidene fluoride composite separation membrane

A polyvinylidene fluoride and separation membrane technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of water-soluble pollutants reaching the standard discharge, and achieve excellent adsorption characteristics and solution permeability Effect

Inactive Publication Date: 2020-10-02
宋泽霖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a preparation method of polyvinylidene fluoride composite separation membrane to solve the problems in the prior art above, so that the composite separation membrane can effectively intercept and remove high-concentration heavy metals, nitrates and phosphates in wastewater and other pollutants, effectively solving the problem of meeting the discharge standards of water-soluble pollutants in water bodies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation of embodiment 1 polyvinylidene fluoride composite separation membrane

[0056] (1) Alkaline treatment of polyvinylidene fluoride film

[0057] a. First, add 20g of polyvinylidene fluoride powder into a beaker with a volume of 250mL containing 100g of N,N-dimethylacetamide, and place the beaker on a temperature-controllable magnetic stirrer, and mix the solution in the beaker Stir and heat up at the same time, set the temperature to 60°C, and stir magnetically for 2 hours. After the polyvinylidene fluoride is completely dissolved in N,N-dimethylacetamide, a colorless, transparent and viscous film casting solution is obtained. The film The casting solution is poured on the automatic film scraping machine, and scraped to form a film with a thickness of 0.1mm. The glass plate with the liquid film is removed from the automatic film scraping machine and immersed in a condensation bath for gelation and film formation. The condensation bath solution is Deionize...

Embodiment 2

[0084] Preparation of Example 2 Polyvinylidene Fluoride Composite Separation Membrane

[0085] (1) Alkaline treatment of polyvinylidene fluoride film

[0086]a. First, add 22g of polyvinylidene fluoride powder into a beaker with a volume of 250mL containing 100g of N,N-dimethylacetamide, and place the beaker on a temperature-controllable magnetic stirrer, and mix the solution in the beaker Stir and heat up at the same time, set the temperature to 65°C, and stir magnetically for 2 hours. After the polyvinylidene fluoride is completely dissolved in N,N-dimethylacetamide, a colorless, transparent and viscous film casting solution is obtained. The film The casting solution is poured on the automatic film scraping machine, and scraped to form a film with a thickness of 0.12mm. The glass plate with the liquid film is removed from the automatic film scraping machine and immersed in a condensation bath for gelation and film formation. The condensation bath solution is Deionized water...

Embodiment 3

[0113] Preparation of Example 3 Polyvinylidene Fluoride Composite Separation Membrane

[0114] (1) Alkaline treatment of polyvinylidene fluoride film

[0115] a. First, add 24g of polyvinylidene fluoride powder into a beaker with a volume of 250mL containing 100g of N,N-dimethylacetamide, and place the beaker on a temperature-controllable magnetic stirrer, and mix the solution in the beaker Stir and heat up at the same time, set the temperature to 70°C, and stir magnetically for 1.5 hours. After the polyvinylidene fluoride is completely dissolved in N,N-dimethylacetamide, a colorless, transparent and viscous film casting solution is obtained. The The film casting solution is poured on the automatic film scraping machine, and scraped to form a film with a thickness of 0.14mm. The glass plate with the liquid film is removed from the automatic film scraping machine and immersed in a condensation bath for gelation to form a film. The condensation bath solution It is deionized wat...

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Abstract

The invention discloses a preparation method of a polyvinylidene fluoride composite separation membrane. Firstly, an alkalized polyvinylidene fluoride membrane is prepared and subjected to grafting modification with acrylamide and oxidation with sodium hypochlorite, and the treated membrane conducts chemical bonding action with graphite oxide and tetraethylenepentamine respectively; then a graphite oxide-polyvinylidene fluoride-tetraethylenepentamine separation membrane is prepared through the phase transfer technology; and finally an aromatic amide nanofiltration ultra-thin layer is formed onthe surface of the graphite oxide-polyvinylidene fluoride-tetraethylenepentamine separation membrane through an interfacial polymerization reaction, and the polyvinylidene fluoride composite separation membrane is prepared. The composite separation membrane prepared by the invention can effectively reject and remove high concentration of pollutants such as heavy metals, nitrates and phosphates inwastewater, the problem of up-to-standard discharge of water-soluble pollutants in the water body is solved, and the polyvinylidene fluoride composite separation membrane has a wide application prospect in the field of water treatment.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a preparation method of a polyvinylidene fluoride composite separation membrane. Background technique [0002] With the rapid development of petrochemical, pharmaceutical, chemical, microelectronics, precision manufacturing and other industries and the advancement of integrated agricultural production, as well as the increase in the discharge of wastewater from sewage plants, heavy metals, nitrates and phosphates are discharged into natural water bodies. The problem is getting more and more attention. Heavy metal pollutants and water eutrophication pollutants discharged into natural water bodies will cause serious harm to aquatic ecosystems and human health. Therefore, efficient disposal of pollutants such as heavy metals, nitrates and phosphates before discharge of various types of wastewater is an important measure to ensure the ecological health of the water envi...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/06B01D71/02B01D67/00
CPCB01D67/0079B01D71/021B01D71/06B01D71/34
Inventor 宋泽霖吴科元苏殿钊王丽华王秀丽
Owner 宋泽霖
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