Antibacterial oxidized graphene modified PVDF (polyvinylidene fluoride) hollow fibrous membrane and preparation method thereof

Abstract

The invention relates to an antibacterial oxidized graphene modified PVDF hollow fibrous membrane and a preparation method thereof. The antibacterial oxidized graphene modified PVDF hollow fibrous membrane is prepared from the following ingredients: polyvinylidene fluoride, oxidized graphene, a composite coupling agent, a surface active agent, a pore forming agent, a hydrophilic agent and a solvent. The preparation method comprises the steps that after oxidized graphene is subjected to vacuum drying, the composite coupling agent and polyvinylidene fluoride are added and mixed, and a dry powdery material is prepared; the dry powdery material is added into a mixed solution which is formed through blending of the surface active agent, the pore forming agent, the hydrophilic agent and the solvent to prepare spinning liquid, and the spinning liquid is subjected to membrane preparation through a solution spinning method technology and a membrane complexing technology. The prepared hollow fibrous membrane has the advantages that the porosity is high, the pores are distributed evenly and easy to control, the chemical property is stable, and the membrane has the catalytic and antibacterialfunctions, the membrane can achieve the effects of accelerating oxygenolysis of pollutants and preventing bacteria from proliferating on the surface of the membrane in the wastewater treatment process, and accordingly the anti-pollution property and the filtering effect of the membrane are improved.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membranes, in particular to an antibacterial graphene oxide modified PVDF hollow fiber membrane and a preparation method thereof. Background technique [0002] Hollow fiber membranes can be widely used in the treatment of industrial and municipal sewage, the preparation of ultrapure water, air filtration, the preparation of sterile pharmaceuticals, the separation of biological agents and other fields. PVDF is a crystalline polymer with good properties. Compared with polymers such as polyvinyl chloride (PVC), polypropylene (PP), polysulfone (PSF) and polyacrylonitrile (PAN), PVDF has The advantages of high mechanical strength, stable chemical properties, good corrosion resistance and anti-pollution performance make it a more ideal molding substrate. The production method of PVDF hollow fiber membrane is still dominated by the phase change method, among which the immersion precipitation phase ...

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Problems solved by technology

However, the mechanical strength of the hollow fiber membranes prepared by the solution phase inversion method is poor, and the membranes will become brittle and deteriorate during chemical cleaning, especially in the alkaline cleaning solution; the mechanical strength of the membranes prepared by the thermally induced phase separation method It is 4 to 5 times that of the membrane filament prepared by the solution phase inversion method, and its chemical resistance is also high, but it is easy to cause the membrane filament to be brittle and easy to break

However, in practical applications, it is found that a large amount of soluble proteins, humus and sodium alginate organic matter in sewage can easily cause membrane fouling (microbial growth or physical and chemical reactions), resulting in narrowing and blockage of membrane pores, membrane water permeability and A severe decrease in retention capacity

[0003] Currently, GO-modified PVDF hollow fiber membranes reinforced with crochet mesh tubes with high strength, catalytic and antibacterial effects are rarely reported.

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