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A kind of graphene oxide framework composite film and its preparation method and application

A composite membrane and graphene technology, applied in the field of membrane separation, can solve the problems of few research reports, and achieve the effect of simple preparation process, easy operation and good repeatability

Active Publication Date: 2022-02-11
JIANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Nevertheless, the above-mentioned reports are sheet-like membranes synthesized with organic membranes as supports and are only used for gas and liquid separation. There are few research reports on GO-based composite membrane materials for seawater desalination and desalination, especially GOF membrane materials with high water flux, high desalination rate and high stability at room temperature are urgently needed to be developed

Method used

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  • A kind of graphene oxide framework composite film and its preparation method and application
  • A kind of graphene oxide framework composite film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Graphene oxide was stirred and dispersed in water, and ultrasonically dispersed for 30 minutes to prepare a mass fraction of 0.08g L -1 graphene oxide dispersion.

[0028] (2) Add ethylene glycol bis-2-aminoethyl ether (also known as 2,2'-(ethylenedioxy)bis(ethylamine) to the above-mentioned graphene oxide aqueous dispersion, the structural formula NH 2 (CH 2 CH 2 O) 2 CH 2 CH 2 NH 2 ) was stirred and ultrasonically reacted at room temperature for 2h to obtain solution A. Wherein the mass ratio of ethylene glycol bis-2-aminoethyl ether to graphene oxide is 10:1.

[0029] (3) Dip-coat solution A on tubular Al with an average pore size of 10 nm by vacuum filtration. 2 o 3 A composite membrane is formed on the porous support, and then the composite membrane is placed in a vacuum oven at 30° C. to dry for 6 hours to obtain a graphene oxide frame composite membrane.

[0030](4) The pervaporation desalination performance of the prepared graphene oxide framework ...

Embodiment 2-4

[0034] In the process of preparing solution A, the mass ratio of the covalent crosslinking agent ethylene glycol bis-2-aminoethyl ether to graphene oxide was changed, and other preparation conditions were the same as in Example 1, and a series of different crosslinking agents and The GOF composite membrane of graphene oxide ratio (ie embodiment 2~4). The test conditions of pervaporation desalination performance are the same as in Example 1, and the desalination performance of these GOF composite membranes is shown in Table 1.

[0035] Table 1. Desalination performance of GOF composite membranes in Examples 2-4

[0036]

Embodiment 5-7

[0038] During the preparation of solution A, the type of covalent cross-linking agent was changed, that is, other diamine molecules containing ether oxygen groups were used instead of ethylene glycol bis-2-aminoethyl ether, and other preparation conditions were the same as in Example 1. , a series of GOF composite membranes cross-linked by different covalent cross-linking agents can be obtained (respectively corresponding to Examples 5-7). Other covalent crosslinking agents for diamine small molecules containing ether oxygen groups are: bis(2-aminoethyl)ether (also known as 2,2-oxodiethylamine, the simplified structure NH 2 CH 2 CH 2 OCH 2 CH 2 NH 2 ), bis[2-(2-aminoethoxy)ethyl]ether (also known as 3,6,9-trioxaundecane-1,11-diamine, structural formula NH 2 (CH 2 CH 2 O) 3 CH 2 CH 2 NH 2 ), diethylene glycol bis(3-aminopropyl) ether (also known as 4,7,10-trioxy-1,13-tridecanediamine, the simplified structure NH 2 CH 2 (CH 2 CH 2 O) 3 CH 2 CH 2 CH 2 NH 2 ). ...

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Abstract

The invention relates to a graphene oxide frame composite membrane used for seawater desalination and desalination treatment and a preparation method thereof. In this method, graphene oxide is cross-linked with small diamine molecules containing ether oxygen groups through ultrasonic stirring to form a graphene oxide framework composite with a stable covalent structure. A graphene oxide framework composite membrane with high stability and high desalination performance was prepared. By adjusting the ratio and structure of diamine small molecules containing ether oxygen groups, the size of nano-water channels in the graphene oxide framework composite membrane layer can be precisely adjusted, thereby improving the retention rate of salt ions by the membrane. The preparation process of the present invention is simple, easy to operate, has good repeatability, significantly improves the water flux and desalination rate of the membrane, and has a stable separation performance of the membrane during long-term operation. The field has broad application prospects.

Description

technical field [0001] The invention relates to a graphene oxide frame composite membrane with high water flux, high desalination rate and high stability, a preparation method thereof and an application in pervaporation desalination, belonging to the technical field of membrane separation. Background technique [0002] Water is the source of life, the lifeblood of social and economic development, and a precious and irreplaceable natural resource for human beings. With the development of industrial production and economy, the pollution of industrial wastewater is becoming more and more serious, and the fresh water resources are becoming increasingly scarce, which poses a serious threat to human life and its ecological system. Desalination (seawater desalination) of seawater, which accounts for more than 99% of the world's total water resources, has become one of the important ways to solve the water resource crisis. As a new type of two-dimensional membrane material, graphen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00C02F1/44C02F103/08
CPCY02A20/131
Inventor 张小亮曾雯娟傅炳鑫
Owner JIANGXI NORMAL UNIV
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