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Preparation method of graphene oxide/attapulgite/polyvinyl alcohol ceramic matrix composite membrane

A technology of ceramic matrix and attapulgite, applied in chemical instruments and methods, permeation/dialysis water/sewage treatment, membrane technology, etc., can solve problems such as hindering the dispersion of GO nanosheets, achieve improved membrane flux, and simple preparation process , low-cost effect

Inactive Publication Date: 2019-07-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the contrary, the GO composite film with PVA cannot be redispersed in water by shaking or stirring, and even ultrasound cannot disperse it, and PVA molecules stick GO sheets together like mortar to form a "brick-mortar" structure, thus Hinder the dispersion of GO nanosheets in aqueous solution
At present, there is no literature or patent report on the application of composite membranes.

Method used

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  • Preparation method of graphene oxide/attapulgite/polyvinyl alcohol ceramic matrix composite membrane
  • Preparation method of graphene oxide/attapulgite/polyvinyl alcohol ceramic matrix composite membrane

Examples

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Embodiment 1

[0022] Dissolve 10 g of 3-aminopropyl-triethoxysilane in 1 L of absolute ethanol to form a mixed solution of 10 g / L, and soak the Al2O3 ceramic substrate with a pore size of 0.5 μm in the mixed solution for 5 h , rinsed with deionized water after being taken out, and dried in an oven at 120 °C for 3 h.

[0023] A small amount of PVA was dissolved in water under the condition of heating and stirring at 80 °C to prepare a 1 wt% mass concentration solution for later use.

[0024] Measure 1 ml of 1 mg / L graphene oxide dispersion, 5 mg of attapulgite and 60 mg of 1 wt% PVA solution at a ratio of m(GO:ATP)=1:5, mix and dilute to 15 mL, and the solution was stirred for 30 min, at which point the total mass of the membrane was 6.6 mg.

[0025] Slowly pour the solution into a suction filter bottle, vacuum filter it on the Al2O3 ceramic substrate, completely drain it to form a film, take it out, put it in an oven for 2 h at 50 °C, and prepare GO / ATP / PVA (10%) Composite film such as f...

Embodiment 2

[0027] Dissolve 10 g of 3-aminopropyl-triethoxysilane in 1 L of absolute ethanol to form a mixed solution of 10 g / L, and soak the Al2O3 ceramic substrate with a pore size of 0.2 μm in the mixed solution for 5 h , rinsed with deionized water after being taken out, and dried in an oven at 120 °C for 3 h.

[0028] A small amount of PVA was dissolved in water under the condition of heating and stirring at 80 °C to prepare a 1 wt% mass concentration solution for later use.

[0029] Measure 1 ml of 1 mg / L graphene oxide dispersion, 20 mg of attapulgite and 105 mg of 1 wt% PVA solution at a ratio of m(GO:ATP)=1:20, mix and dilute to 15 mL, and the solution was stirred for 30 min, at which point the total mass of the membrane was 22.05 mg.

[0030] Slowly pour the solution into a suction filter bottle, filter it on the Al2O3 ceramic substrate by vacuum suction, completely drain it to form a film, take it out, put it in an oven for 2 h at 50 °C, and prepare GO / ATP / PVA (5%) Composite ...

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Abstract

The invention provides a preparation method of a graphene oxide / attapulgite / polyvinyl alcohol ceramic matrix composite membrane (GO / ATP / PVA composite membrane). A Al2O3 ceramic matrix is pretreated through 3-aminopropyl triethoxysilane (APTES), so that the binding force between the matrix and the composite membrane is increased, PVA is added to increase the swelling resistance of the composite membrane, and the GO / ATP / PVA composite membrane is prepared on the surface of the ceramic matrix through a vacuum filtration-low temperature drying method. The GO / ATP / PVA composite membrane has the advantages that the performance in the application of separating industrial wastewater is excellent, the preparation process is simple, the cost is low, and the preparation method is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide / attapulgite / polyvinyl alcohol ceramic matrix composite membrane, and belongs to the field of membrane separation in wastewater treatment. Background technique [0002] Graphene oxide is currently a popular two-dimensional material that can be used as a separation membrane, and the complete graphene oxide is impermeable to all molecules. If the graphene oxide nanosheets are stacked layer by layer to form a macroscopic membrane, the sheet can be used Separation of substances with the nanochannels formed between the sheets. Since the almost frictionless surface of graphene oxide can ensure the rapid transfer of molecules in the formed 2D capillary, the substantial role of designing layered films by stacking monolithic graphene oxide is very large, based on the structural properties of graphene oxide. Unique, it can be easily assembled and form a layered structure with the assistance of vac...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/38B01D69/12B01D69/10B01D69/02C02F1/44
CPCB01D67/0079B01D69/02B01D69/105B01D69/12B01D71/38C02F1/44
Inventor 乔宁刘伟徐斌邹凯然
Owner BEIJING UNIV OF CHEM TECH
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