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Preparation method of GO (graphene oxide)-SiO2 hybrid particle composite fiber super/microfiltration membrane

A technology of hybrid particles and composite fibers, which is applied in chemical instruments and methods, ultrafiltration, membranes, etc., can solve the problems of poor compatibility between inorganic materials and organic phase solvents, and easy agglomeration of composite membrane nanomaterials, so as to reduce the inherent span Effects of Membrane Resistance, Enhanced Hydrophilicity, and Increased Solubility

Active Publication Date: 2017-03-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

Chinese patent CN 102600734 "Reinforced Graphene Oxide Hollow Fiber Composite Membrane and Its Preparation Method" uses graphene oxide as a nano-additive to prepare a composite membrane that has the characteristics of traditional nano-materials being easy to agglomerate and the existence of a gap between the inorganic material and the organic phase solvent. Poor compatibility and other issues
[0005] The invention of novel graphene oxide-silica hybrid particle composite fiber ultra / microfiltration membrane has not been reported yet

Method used

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  • Preparation method of GO (graphene oxide)-SiO2 hybrid particle composite fiber super/microfiltration membrane

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preparation example Construction

[0031] A preparation method of graphene oxide-silicon dioxide hybrid particle composite fiber ultra / microfiltration membrane, comprising the following steps:

[0032] 1) Preparation of graphene oxide-silica hybrid particles: prepare a mixed solution with a concentration of 60-95 wt% absolute ethanol and pure water, add 2-50 mg of graphene oxide powder to 1L of the mixed solution according to the mass ratio, Adjust the pH value to 8.0-9.0 to obtain an alkaline solution, drop 0.5-5mL tetraethyl orthosilicate into 1L of alkaline solution according to the mass ratio, ultrasonicate, store at room temperature for 20-30h, centrifuge, and wash repeatedly with absolute ethanol The filter cake was vacuum freeze-dried for 24 hours, and the obtained particles were stored for future use;

[0033] 2) Preparation of coating casting solution: Graphene oxide-silicon dioxide hybrid particles with a mass fraction of 0.1 to 1% are added to 60 to 91% of organic solvents (N-N dimethylacetamide, N-N...

Embodiment 1

[0043] 1) Preparation of graphene oxide-silica hybrid particles: prepare a mixed solution with a concentration of 60wt% absolute ethanol and pure water, add 2mg graphene oxide powder to the mixed solution with a mass ratio of 1L, and adjust the pH value to 8.0, add 0.5mL tetraethyl orthosilicate dropwise to 1L alkaline mixed solution for sonication, sonicate the resulting solution for 0.5h, store at room temperature for 20h. Afterwards, the mixed solution was centrifuged, and the filter cake was repeatedly washed with absolute ethanol for 3 times, vacuum freeze-dried for 24 hours, vacuum freeze-dried, and the obtained particles were stored for future use;

[0044] 2) Preparation of coating casting solution: add 0.1% graphene oxide-silica hybrid particles to 90.89% organic solvent (N-N dimethylacetamide, N-N dimethylformamide, tetrahydrofuran 1 :1:1 blending), high-speed stirring for 10 minutes, mechanical stirring speed of 50rpm. Add 0.001wt% solubilizer (0.015:1 mixture of t...

Embodiment 2

[0054] 1) Preparation of graphene oxide-silica hybrid particles: prepare a mixed solution with a concentration of 70wt% absolute ethanol and pure water, add 5 mg of graphene oxide powder to the mixed solution with a mass ratio of 1L, and adjust the pH value to 8.3. Add 1.0mL tetraethyl orthosilicate dropwise to 1L alkaline mixed solution for sonication, sonicate the resulting solution for 1h, and store it at room temperature for 20h. Afterwards, the mixed solution was centrifuged, and the filter cake was repeatedly washed with absolute ethanol for 4 times, vacuum freeze-dried for 24 hours, and vacuum freeze-dried, and the obtained particles were stored for future use;

[0055] 2) Preparation of coating casting solution: add 0.3% graphene oxide-silica hybrid particles into 88.69% organic solvent (dichloromethane, formic acid, acetone 1:1:1 blend) , high-speed stirring for 15min, mechanical stirring speed of 50rpm. Add 0.002wt% solubilizer (0.02:1 mixture of triethanolamine TEO...

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Abstract

The invention discloses a preparation method of a GO (graphene oxide)-SiO2 hybrid particle composite fiber super / microfiltration membrane. The method comprises the following steps: 1) preparing GO-SiO2 hybrid particles; 2) preparing a high-molecular polymer, an additive, the GO-SiO2 hybrid particles, a solubilizer and an organic solvent into multiple homogenized film casting solutions in different proportions; 3) removing stains on the surface of a braided hose; 4) uniformly coating the film casting solution onto the outer wall of the braided hose; and 5) sending the coated braided hose into a gel bath, and carrying out phase splitting, thereby finally obtaining the modified hollow fiber composite super / microfiltration membrane. The GO-SiO2 hybrid particles with favorable dispersity are added to effectively enhance the solubility of the nanoparticles in the film casting solution under the synergic action of the solubilizer, thereby enhancing the tensile strength of the hollow fiber composite membrane wire and obtaining larger membrane area by using a small amount of the film casting solution. The composite membrane has high anti-pollution and antibacterial capacities, and maintains higher flux and a certain interception rate.

Description

technical field [0001] The invention belongs to the technical field of preparation of separation membranes, in particular to a graphene oxide-silicon dioxide (GO-SiO 2 ) Preparation method of hybrid particle composite fiber ultra / microfiltration membrane. Background technique [0002] Membrane Bioreactor (MBR) process technology is one of the efficient technologies in the field of wastewater treatment. In recent years, with the increasingly stringent requirements for effluent standards and the gradual reduction in the cost of membrane materials, the demand for membrane separation technology has increased. This process combines membrane separation technology with traditional sewage biological treatment technology, and uses membrane separation process to replace the secondary sedimentation tank in the traditional activated sludge treatment process. The MBR process can simultaneously realize the degradation of pollutants by microorganisms and the pollution of membranes The se...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/08B01D69/02B01D67/00B01D71/34B01D71/38B01D71/56B01D71/42B01D71/30B01D71/68B01D71/48B01D71/16B01D71/02B01D61/14
CPCB01D61/145B01D61/147B01D67/0079B01D69/02B01D69/08B01D69/12B01D71/021B01D71/027B01D71/16B01D71/30B01D71/34B01D71/38B01D71/42B01D71/48B01D71/56B01D71/68B01D2325/36
Inventor 王磊朱振亚王旭东吕永涛陈立成黄丹曦苗瑞姜家良徐亚伟李青青李陈刘婷婷
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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