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Three-dimensional oxidized graphene frame film and preparing method and application thereof

A graphene membrane and graphene technology, applied in the field of materials, can solve the problems of reduced separation performance, uncontrollable channels, and prone to defects

Active Publication Date: 2016-08-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0008] Studies have shown that the strength of monolayer graphene oxide is very high, but the strength will be very low after the monolayer graphene oxide is assembled into a graphene oxide film, and it is easy to have defects in the application process, and the separation performance will be greatly affected. reduce
The graphene oxide films reported in the current research are all prepared by drip coating, spin coating, and vacuum filtration. The pores are not adjustable, and their thickness is generally at the nanometer level. Cracks will appear on the surface of the membrane, resulting in a decrease in its separation performance

Method used

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  • Three-dimensional oxidized graphene frame film and preparing method and application thereof
  • Three-dimensional oxidized graphene frame film and preparing method and application thereof
  • Three-dimensional oxidized graphene frame film and preparing method and application thereof

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preparation example Construction

[0091] The present invention also provides a method for preparing the frame film, comprising the following steps:

[0092] i) providing PDI-modified graphene oxide and PDI-modified porous alumina tubular support; and

[0093] ii) loading the PDI-modified graphene oxide on the surface of the PDI-modified porous alumina tubular support by vacuum filtration to obtain the framework membrane.

[0094] In another preferred example, the vacuum filtration pressure in step ii) is 0.05-1 MPa.

[0095] In another preferred embodiment, after step ii), a step is further included: drying and curing the product obtained in the preceding steps at 20-40°C.

[0096] In another preferred example, the time for the drying and curing treatment is 1-48 hours, preferably 5-30 hours.

[0097] In the present invention, the graphene oxide modified by PDI is prepared as follows:

[0098] a-1) providing a first mixed solution, said first mixed solution comprising graphene oxide, PDI and a first solvent...

Embodiment 1 3

[0119] Embodiment 1 Three-dimensional graphene oxide frame film 1

[0120] Step 1. PDI functional modification of graphene oxide

[0121] Graphene oxide is modified with p-phenylene diisocyanate PDI to increase the interlayer distance, form covalent bonds between graphene oxide sheets, and connect graphene oxide sheets.

[0122] 40ml of the graphene oxide DMF dispersion with a concentration of 0.625mg / mL was mixed with 40ml of a DMF dispersion of PDI with a concentration of 0.025mg / mL, and stirred at room temperature for 24h to react.

[0123] Step 2: PDI functional modification of porous tubular alumina carrier

[0124] Put the porous alumina tubular support into 40ml of DMF emulsion dispersed with 1mmol of p-phenylene diisocyanate, and treat it at 110°C for 3h, so as to introduce -CNO organic functional group on the surface of the porous alumina tubular support (which is combined with the alumina support surface hydroxyl groups) to form a p-phenylene diisocyanate modified ...

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Abstract

The invention relates to a three-dimensional oxidized graphene frame film and a preparing method and application thereof. Particularly, the invention discloses a three-dimensional oxidized graphene frame film used for sea water desalination, the frame film comprises an oxidized graphene film layer modified by p-phenyl diisocyanate (PDI) and an optional porous alumina tubular carrier used for loading the oxidized graphene film layer modified by p-phenyl diisocyanate (PDI), and the porous alumina tubular carrier is modified by PDI. The invention further discloses the preparing method and application of the frame film. The frame film has the advantages that the preparation process is simple, the thickness and the interlayer spacing are controllable, and the frame film is uniform and dense, high in stability in water and excellent in sea water desalination performance and can greatly promote development of the sea water desalination technology.

Description

technical field [0001] The invention relates to the field of materials, in particular to a three-dimensional graphene oxide frame film and its preparation method and application. Background technique [0002] Water is the source of life and the basic condition for the growth of all things. With the rapid growth of population, the rapid development of basic industries such as industry and agriculture, and the increasing environmental pollution, the extreme shortage of water resources has become a worldwide common problem. There are more than 100 countries in the world that suffer from water shortages to varying degrees. my country's per capita water resources are only 2200m 3 , which is only 1 / 4 of the world's average level, and is one of the 13 countries with the poorest per capita water resources in the world. In my country, about 2 / 3 of the cities are in a state of water shortage, and 110 cities are seriously short of water. [0003] In addition, due to improper use an...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/04B01D69/12B01D71/06B01D71/02
CPCB01D67/0079B01D69/04B01D69/12B01D71/021B01D71/025B01D71/06
Inventor 黄爱生冯博
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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