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Preparation method of polyvinylidene fluoride porous membrane with diversity charging surface

A polyvinylidene fluoride membrane and polyvinylidene fluoride technology, which is applied in the field of surface modification of separation membranes, can solve the problems of organic pollutant accumulation, reduce separation efficiency and service life, and achieve the effect of good anti-pollution performance.

Inactive Publication Date: 2014-06-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyvinylidene fluoride (PVDF) has good chemical inertness, thermal stability and mechanical properties, and is an ideal membrane material. Aggregation in membrane pores greatly reduces separation efficiency and service life

Method used

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  • Preparation method of polyvinylidene fluoride porous membrane with diversity charging surface
  • Preparation method of polyvinylidene fluoride porous membrane with diversity charging surface
  • Preparation method of polyvinylidene fluoride porous membrane with diversity charging surface

Examples

Experimental program
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Effect test

Embodiment 1

[0029] After a certain length of PVDF hollow fiber membrane is cleaned and dried, it is placed in a low-temperature plasma instrument for pretreatment. The treatment conditions are: the distance between the membrane and the electrode is 5 cm, the discharge gas in the chamber is oxygen, and the discharge power It is 50 watts, the gas pressure is 20 Pa, and the processing time is 60 seconds. The pretreated PVDF membrane was oxidized in air for 10 minutes, then immersed in 50% acrylic acid aqueous solution, and carried out surface graft polymerization reaction under nitrogen protection for 2 hours, and the reaction temperature was 60°C to obtain a PVDF membrane with polyacrylic acid surface modification ; The PVDF membrane with polyacrylic acid surface modification was placed in 1% chitosan solution, 1% sodium alginate solution, 1% chitosan solution, 1% sodium alginate solution for adsorption, each time for 10min, each time Before and after the first adsorption, the modified memb...

Embodiment 2

[0031] After a certain length of PVDF hollow fiber membrane is cleaned and dried, it is placed in a low-temperature plasma instrument for pretreatment. The treatment conditions are that the distance between the membrane and the electrode is 5 cm, the discharge gas introduced into the chamber is oxygen, and the gas pressure is 20 Pa, the discharge power is 150 watts, and the processing time is 30 seconds. The pretreated PVDF membrane was oxidized in the air for 10 minutes, then immersed in 50% acrylic acid aqueous solution, and the surface graft polymerization was carried out under nitrogen protection for 3 hours, and the reaction temperature was 50°C to obtain a polyacrylic acid surface-modified PVDF membrane. , and finally the PVDF membrane with polyacrylic acid surface modification was placed in 1% chitosan solution, 1% polyacrylic acid solution, 1% chitosan solution, and 1% polyacrylic acid solution for adsorption, each time for 150min, each time Before and after adsorption...

Embodiment 3

[0033] After a certain length of PVDF hollow fiber membrane is cleaned and dried, it is placed in a low-temperature plasma instrument for pretreatment. The treatment conditions are that the distance between the membrane and the electrode is 5 cm, the discharge gas introduced into the chamber is oxygen, and the gas pressure is 30 Pa, the discharge power is 60 watts, and the processing time is 180 seconds. The pretreated PVDF membrane was oxidized in the air for 10 minutes, then immersed in 50% acrylic acid aqueous solution, and the surface graft polymerization was carried out under nitrogen protection for 0.5 hours, and the reaction temperature was 8°C to obtain a polyacrylic acid surface-modified PVDF membrane. , and then the polyacrylic acid surface-modified PVDF membrane was placed in 1% chitosan solution, 1% polyphosphate solution, 1% chitosan solution, and 1% polyphosphate solution for adsorption. 90min, before and after each adsorption, the modified membrane should be ful...

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Abstract

The invention provides a preparation method of a polyvinylidene fluoride porous membrane with a diversity charging surface. The preparation method is characterized by comprising the following steps of step 1, cleaning and airing a polyvinylidene fluoride membrane, preprocessing the polyvinylidene fluoride membrane in a low-temperature plasma instrument, and oxidizing the preprocessed polyvinylidene fluoride membrane in air; step 2, soaking the oxidized polyvinylidene fluoride membrane in an acroleic acid water solution and carrying out surface grafting polyreaction to obtain a polyacrylic acid surface modified PVDF (Polyvinylidene Fluoride) membrane; and step 3, cleaning the polyacrylic acid surface modified PVDF membrane, adsorbing and cleaning the modified PVDF membrane in a polyanion electrolyte solution, a polycation electrolyte solution or a zwitterion lycine polymer solution so as to obtain the polyvinylidene fluoride porous membrane with a charging surface the outermost surface of which has electronegativity, electropositivity or electric neutrality. The prepared polyvinylidene fluoride separation membrane with the diversity charging surface provided by the invention achieves the good anti-pollution property.

Description

technical field [0001] The invention belongs to the field of surface modification of separation membranes, and in particular relates to a method for preparing polyvinylidene fluoride porous membranes with diverse charged surfaces by using plasma technology and electrostatic adsorption. Background technique [0002] Water treatment technology is closely related to the utilization and protection of water resources on which human beings depend. With the development of society and economy, it has become the most concerned issue. Membrane separation technology has shown great potential in water treatment technology, but due to the water treatment environment The complexity and diversity of industrial wastewater, domestic sewage, drinking water treatment and other fields, there are various separation environments such as acidic, alkaline, organic solvents, etc. During the separation process, problems such as membrane fouling and membrane corrosion have seriously restricted the deve...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02
Inventor 何春菊赵新振秦爱文马博谋刘大朋李翔
Owner DONGHUA UNIV
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