Preparation method of high-throughput graphene oxide-cellulose acetate composite membrane

A cellulose acetate and graphene technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as uneven dispersion, and achieve the effects of simple process, improved performance and high efficiency

Active Publication Date: 2015-12-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical scheme of the present invention is: combined with the intrinsic properties of graphene oxide, it overcomes the problem of graphene oxide agglomeration and uneven dispersion in the traditional addition method; the present invention dissolves graphene oxide preferentially in formamide, making formamide It is not only an important additive in the film-making process, but also a good solvent for graphene oxide, which prevents the agglomeration of the introduced graphene oxide from affecting the performance of the final film.

Method used

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  • Preparation method of high-throughput graphene oxide-cellulose acetate composite membrane

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Experimental program
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Effect test

Embodiment 1

[0031] 1) Preparation of graphene oxide powder:

[0032] Get 8g (325 order) natural flake graphite and 550ml mass concentration be 98% sulfuric acid after mixing uniformly, add 10.0g potassium nitrate, add 60g potassium permanganate rapidly in the water bath of 15 ℃, mix homogeneously. Then the temperature of the system was raised to 40°C, reacted for 3h, then added 300ml of water, and simultaneously the system was heated to 80°C for 30min, then the excess potassium permanganate was reduced with 500ml of distilled water and 100ml of hydrogen peroxide (30wt%), and centrifugally washed to The pH is 5, diluted to a certain concentration, 100kHz ultrasonic for 2 hours to obtain a graphene oxide aqueous solution, and freeze-dried to obtain a graphene oxide powder.

[0033] 2) Preparation of graphene oxide / formamide solution:

[0034] Disperse the powder of 1) in formamide to form a 0.1 g / L graphene oxide suspension, and sonicate at 40 kHz for 0.5 h to obtain a uniform graphene oxi...

Embodiment 2

[0042] 1) Preparation of graphene oxide / formamide solution:

[0043] The graphene oxide powder was dispersed in formamide to prepare a 1 g / L graphene oxide suspension, and ultrasonicated at 100 kHz for 4 hours to obtain a uniform graphene oxide / formamide solution.

[0044] 2) Configuration of casting solution

[0045] Add cellulose acetate and acetone into the dissolving tank, after fully stirring, add the solution of 2) and formamide into the dissolving tank, and control the weight percentage of the substance in the casting solution to be 15% of cellulose acetate, 69.9995% of acetone, and graphite oxide Alkenes 0.0005%, formamide 15%. Dissolve under mechanical stirring at 100rmp / min for 24h.

[0046] 3) Degassing treatment

[0047] The casting solution was protected from light, sonicated at 100kHz for 2h, and then placed at 10°C to remove residual air bubbles.

[0048] 4) Preparation of composite membrane

[0049] After scraping the film, the casting solution was volatil...

Embodiment 3

[0051] In embodiment 2, cellulose acetate and acetone are added in the dissolving tank, and after fully stirring, the solution of 2) and formamide are added in the dissolving tank, and the weight percentage of substances in the casting solution is controlled to be 30% of cellulose acetate, acetone 59.999%, graphene oxide 0.001%, formamide 10%. Other conditions remain unchanged to obtain graphene oxide / cellulose acetate composite membrane.

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Abstract

The invention discloses a preparation method of a high-throughput graphene oxide-cellulose acetate composite membrane which is prepared with an immersion precipitation phase inversion process. A casting membrane solution comprises components in mass of the casting membrane solution respectively of 15%-30% of cellulose acetate, 0.0001%-0.01% of graphene oxide, 10%-35% of formamide and 35%-70% of acetone. Single layer graphene oxide has the advantages of large specific surface area and high absorbability, the micro-structure of the membrane can be finely adjusted, and the membrane performance is improved. The prepared high-throughput graphene oxide-cellulose acetate composite membrane has a great application value and potential. Experiments prove that compared with a pure cellulose acetate membrane, the throughput of the high-throughput graphene oxide-cellulose acetate composite membrane is improved by 220%, the operating pressure can be reduced greatly, energy consumption is saved, and the high-throughput graphene oxide-cellulose acetate composite membrane has a better application in the fields of heavy-metal ion removal, industrial waste water treatment and seawater desalination and the like.

Description

Technical field: [0001] The invention relates to the field of membrane technology, in particular to a preparation method of a high-throughput graphene oxide-cellulose acetate composite membrane. Background technique: [0002] my country's per capita fresh water resources are small, and it is a country lacking in water resources. At present, with the development of the economy and the aggravation of pollution, the shortage of water resources in our country is becoming increasingly serious, which seriously threatens the production and life of the people. Therefore, it is imperative to vigorously develop water resources. In view of the two serious problems of water shortage and pollution in our country, membrane separation technology is the most promising ultimate way to solve these problems. Membrane separation technology is a new type of high-efficiency separation technology that is simple, easy to control, and environmentally friendly. It can be widely used in sewage treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/12B01D67/00
Inventor 暴宁钟孙艳何大方沈丽明张晓艳王一峰
Owner NANJING UNIV OF TECH
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