Method for preparing super-hydrophilic composite PVDF ultrafiltration membrane

A technology of ultra-hydrophilic and ultrafiltration membranes, which is applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of limited improvement of hydrophilicity, decreased membrane separation performance, and unstable membrane performance, etc., to achieve improved Effect of anti-pollution performance and improvement of hydrophilicity

Active Publication Date: 2016-12-14
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] PVDF membrane is a newly developed special separation membrane with chemical stability, high pollution resistance, radiation resistance, heat resistance and good physical and mechanical properties, and has become one of the membrane varieties with the best comprehensive performance in the world. First, but the PVDF membrane has low surface energy and strong hydrophobicity, which will cause two problems in the separation process of water treatment: one is that the separation process requires a large driving force and the flux is low; the other is that it is difficult to separate oil / water During the system process, organic pollutants (proteins, etc.) are easily adsorbed on the membrane surface or in the membrane pores to cause membrane fouling, resulting in a decrease in membrane separation performance, a decrease in water flux, and a reduction in the service life of the membrane.
SiO can be made by using 20wt% sodium hydroxide solution at 70°C 2 Particles wash out, resulting in reduced membrane mechanical properties
Because of the inorganic-organic PVDF composite membrane prepared by the blending method, although the method is simple, the SiO 2 Most of the particles are embedded in the membrane matrix, which has a limited degree of improvement in hydrophilicity; in addition, if nano-inorganic particles are blended, agglomeration is prone to occur, resulting in uneven dispersion of particles and unstable performance of the prepared membrane

Method used

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  • Method for preparing super-hydrophilic composite PVDF ultrafiltration membrane
  • Method for preparing super-hydrophilic composite PVDF ultrafiltration membrane
  • Method for preparing super-hydrophilic composite PVDF ultrafiltration membrane

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Embodiment 1

[0031] Step 1. Immerse the commercial PVDF membrane in absolute ethanol for 24 hours, and then repeatedly wash with deionized water to obtain the commercial PVDF membrane after cleaning.

Embodiment 2

[0033] Step 1. Immerse the commercial PVDF membrane in absolute ethanol for 24 hours, and then repeatedly wash with deionized water;

[0034] Step 2. Dissolve 2g / L dopamine into a Tris-HCI buffer solution with a pH of 8.5;

[0035] Step 3. Dip the PVDF membrane cleaned in step 1 into the dopamine solution prepared in step 2, and immerse it at room temperature for 12 hours. The dopamine fully self-polymerizes a polydopamine coating layer on the surface of the PVDF membrane to obtain a polydopamine coating PVDF membrane, the preparation process is shown in 1.

Embodiment 3

[0037] Step 1. Immerse the commercial PVDF membrane in absolute ethanol for 24 hours, and then repeatedly wash with deionized water;

[0038] Step 2. Dissolve 2g / L dopamine into a Tris-HCI buffer solution with a pH of 8.5;

[0039] Step 3. Dip the PVDF membrane cleaned in step 1 into the dopamine solution prepared in step 2, and immerse it at room temperature for 12 hours. The dopamine fully self-polymerizes a polydopamine coating layer on the surface of the PVDF membrane to obtain a polydopamine coating PVDF membrane;

[0040] Step 4. Dissolve trimesoyl chloride into Isobar G In the solution, trimesoyl chloride in Isobar G The weight concentration in the solution is 0.5wt%;

[0041] Step 5. Immerse the PVDF membrane with self-polymerized dopamine in step 3 into the Isobar of trimesoyl chloride in step 4. G Soaking in the solution for 60S, trimesoyl chloride can be grafted onto the PVDF membrane from polydopamine; the preparation process is as follows figure 2 Shown

[0042] Step 6. D...

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Abstract

The invention discloses the technical field of membrane separation materials, particularly a method for preparing a super-hydrophilic composite PVDF ultrafiltration membrane. The method disclosed by the invention comprises the following steps: coating the surface of a PVDF membrane with dopamine, grafting aromatic polyacyl chloride to the PVDF membrane self-polymerized with dopamine, and grafting ammonium salt terminal chemical modified silica nanoparticles onto the PVDF membrane to obtain the super-hydrophilic composite PVDF ultrafiltration membrane prepared by grafting super-hydrophilic nanometer silica onto the PVDF membrane. The invention has the advantages that because the dopamine has active groups such as hydroxyl and amino, due to the processes of taking trimesoyl chloride as a grafting body and the like, the hydrophilicity of the PVDF membrane is greatly improved, so that the pollution resistance of the PVDF membrane is improved.

Description

Technical field [0001] The patent of the present invention relates to the technical field of membrane separation materials, and specifically refers to a preparation method of a super-hydrophilic composite PVDF ultrafiltration membrane. Background technique [0002] PVDF membrane is a newly developed special separation membrane. It has chemical stability, high pollution resistance, radiation resistance, heat resistance and good physical and mechanical properties. It has become one of the best comprehensive performance membrane varieties in the world. First, the PVDF membrane has low surface energy and strong hydrophobicity, which will cause two problems in the water treatment and separation process: one is that the separation process requires a large driving force and the flux is low; the other is the separation of oil / water During the system process, organic pollutants (proteins, etc.) are easily adsorbed on the membrane surface or in the membrane pores, causing membrane fouling,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D71/82B01D71/34B01D71/02B01D69/02B01D69/12B01D67/00
CPCB01D67/0079B01D69/02B01D69/125B01D71/027B01D71/34B01D71/78B01D71/82B01D2325/36
Inventor 陈文兴陈锋涛陈晓兵石星星朱锦桃
Owner ZHEJIANG SCI-TECH UNIV
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