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Enhanced graphene oxide hollow fiber composite membrane and preparation method thereof

A technology of fiber composite and graphene, which is applied in the field of membrane material manufacturing, can solve problems such as hindering the promotion of membrane application, broken wires, and degradation of effluent water quality, and achieve the effects of improving engineering processing capacity, increasing service life, and strengthening membrane strength

Active Publication Date: 2012-07-25
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual use, the strength and pollution resistance of the membrane are the most important technical indicators. In particular, the strength of the hollow fiber membrane is seriously challenged because the membrane filament is relatively thin, usually less than 2mm, and the wall thickness is less than 1mm.
In wastewater treatment, due to the disturbance of aeration, the phenomenon of broken wires often occurs, resulting in the decline of effluent water quality; at the same time, due to the hydrophobic characteristics of polymer materials, the membrane has poor hydrophilicity. A large amount of pollutants are adsorbed, and the water permeability of the membrane will be greatly reduced
Especially in large-scale sewage treatment plants, the problem of flux drop caused by broken filaments and pollution of the membrane has always plagued the operation and management of the membrane, and at the same time hindered the application and promotion of the membrane in such systems
These two lined hollow fiber membrane materials are poor in hydrophilicity, and are easily polluted by organic matter or biological adsorption in the treatment system in actual use, and the application cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method prepares a reinforced graphene oxide hollow fiber composite membrane, the support layer of which is a hollow tube braided by nylon 66, and the membrane separation layer on the surface is graphene oxide.

[0024] Dissolving polyvinylpyrrolidone and graphene oxide with a molecular weight of 10000 in N,N-dimethylformamide, mixing uniformly to prepare a raw material for film-making liquid, wherein the mass content of polyvinylpyrrolidone is 10%, and the mass content of graphene oxide is The mass content is 10%, and the mass content of N,N-dimethylformamide is 80%. The temperature was controlled at 20°C, and the membrane-forming solution was uniformly coated on the inner and outer surfaces of the nylon 66 braided hollow tube. The outer diameter of the braided tube was 4 mm, and the inner diameter was 2 mm. Then immerse it in a coagulation bath of N,N-dimethylacetamide aqueous solution with a mass content of 30% at 40°C for solidification, take it out, soak it in w...

Embodiment 2

[0026] The method prepares a reinforced graphene oxide hollow fiber composite membrane, the support layer of which is a hollow tube braided by nylon 610, and the membrane separation layer on the surface is a mixture of graphene oxide and polymer resin.

[0027] Dissolve polyvinylidene fluoride, polyvinylpyrrolidone with a molecular weight of 300,000, potassium chloride and graphene oxide in N,N-dimethylacetamide, and mix uniformly to prepare the raw material for film-making liquid, wherein the polyvinylidene fluoride The mass content is 20%, the mass content of polyvinylpyrrolidone is 5%, the mass content of potassium chloride is 2%, the mass content of graphene oxide is 0.01%, and the mass content of N,N-dimethylacetamide is 72.99% %. At a temperature of 80°C, the film-making solution is evenly coated on the outer surface of a nylon 610 braided hollow tube. The outer diameter of the braided tube is 2mm, and the inner diameter is 1mm; , solidified in an N-dimethylformamide aq...

Embodiment 3

[0029] The method prepares a reinforced graphene oxide hollow fiber composite membrane, the support layer of which is a polyester braided hollow tube, and the membrane separation layer on the surface is a mixture of graphene oxide and polymer resin.

[0030]Polysulfone, lithium nitrate and graphene oxide are dissolved in acetone, and mixed uniformly to prepare membrane-making liquid raw materials, wherein the mass content of polysulfone is 60%, the mass content of lithium nitrate is 4%, and the mass content of graphene oxide is 2%, the mass content of acetone is 34%. Control the temperature at 60°C to evenly coat the film-making solution on the inner surface of a polyester braided hollow tube with an outer diameter of 1.8 mm and an inner diameter of 0.7 mm, and immerse it in 50% N-methyl The pyrrolidone aqueous solution is solidified in a coagulation bath, then taken out, soaked in water, and dried to form a reinforced graphene oxide hollow fiber composite membrane. The membr...

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Abstract

The invention relates to an enhanced graphene oxide hollow fiber composite membrane and a preparation method of the composite membrane. The composite membrane is characterized in that a supporting layer is a hollow pipe woven by polymer fibers, and a membrane separation layer on a surface is graphene oxide or a mixture of the graphene oxide and polymer resin; and the outer diameter of the hollow pipe woven by the polymer fibers is 1-4mm, and the inner diameter of the hollow pipe woven by the polymer fibers is 0.5-1mm; the thickness of the membrane separation layer is 0.01-1mm; and the membrane pore diameter of the enhanced graphene oxide hollow fiber composite membrane is 1-500nm. The preparation method comprises the following steps: dissolving the polymer resin, an organic additive, an inorganic additive and the graphene oxide into a organic solvent to prepare a membrane preparing solution; coating the membrane preparing solution onto the surface of the hollow pipe woven by the polymer fibers to obtain a blank body of a pre-fabricated composite membrane; and carrying out solidification and formation, rinsing and drying in the air to obtain the enhanced graphene oxide hollow fiber composite membrane. The prepared composite membrane is strong in hydrophilicity, and the water permeability of the composite membrane is greatly improved.

Description

technical field [0001] The invention belongs to the field of membrane material manufacturing, and relates to a highly hydrophilic and reinforced graphene oxide hollow fiber composite membrane and a preparation method thereof. Background technique [0002] More and more high-precision membrane separation technology is considered in the application of water treatment technology. At present, the usage of membrane is gradually increasing, and membrane separation plays a very important role in improving water quality. However, in actual use, the strength and pollution resistance of the membrane are the most important technical indicators. In particular, the strength of the hollow fiber membrane is seriously challenged because the membrane filament is relatively thin, usually less than 2mm, and the wall thickness is less than 1mm. In wastewater treatment, due to the disturbance of aeration, the phenomenon of broken wires often occurs, resulting in the decline of effluent water qua...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/02B01D71/34B01D71/68B01D71/30B01D71/42B01D67/00
Inventor 李卫星邢卫红徐南平
Owner NANJING UNIV OF TECH
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