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A kind of carbon nitride two-dimensional material composite film and its preparation method and application

A technology of two-dimensional materials and carbon nitride, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as research needs to be enriched, and achieve the effect of high mechanical strength and good selective separation effect

Active Publication Date: 2019-07-12
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Relevant research needs to be enriched

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  • A kind of carbon nitride two-dimensional material composite film and its preparation method and application
  • A kind of carbon nitride two-dimensional material composite film and its preparation method and application
  • A kind of carbon nitride two-dimensional material composite film and its preparation method and application

Examples

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Embodiment 1

[0046] This example is to prepare a carbon oxide nitride two-dimensional material-polyvinyl alcohol composite membrane on a tubular ceramic support for separating water and a mixture of C2-C4 alcohols.

[0047] In this embodiment, the steps of preparing carbon oxynitride by the hummer method are as follows.

[0048] 1 g of g-C 3 N 4 -0825 powder, add 50ml of concentrated sulfuric acid. Under the condition of ice bath, slowly add 3.5g potassium permanganate. The flask was immersed in a water bath at 35°C, and the reaction was stirred with a magnetic stirrer for 1 hour. Then 200ml of water was slowly added into the flask under the condition of ice bath, and 30% aqueous hydrogen peroxide was added until no more bubbles were generated. The obtained dispersion was centrifuged at 10,000 rpm for 1 hour. The resulting isolate was washed 3 times with deionized water to reach a pH of 7. Then vacuum dry at 50° C. for 12 h. Remember to oxidize carbon nitride.

[0049] The specific...

Embodiment 2

[0056] A carbon oxide nitride two-dimensional material-polydimethylsiloxane composite membrane was prepared on a tubular ceramic support for the separation of water and a mixture of C2-C4 alcohols.

[0057] In the present embodiment, the steps of preparing carbon oxynitride by the hummer method are as follows: 1g of g-C 3 N 4 -0825 powder, add 40ml of concentrated sulfuric acid. Under the condition of ice bath, slowly add 3.5g potassium permanganate. The flask was immersed in a water bath at 45°C, and the reaction was stirred with a magnetic stirrer for 4 hours. Then, under the condition of ice bath, 200ml of water was slowly added into the flask, and 30% aqueous hydrogen peroxide was added into the flask until no more bubbles were produced. The obtained dispersion was centrifuged at 25,000 rpm for 1 hour. The resulting isolate was washed 3 times with deionized water to reach a pH of 7. Then vacuum dry at 50° C. for 12 h.

[0058] In this embodiment, the preparation meth...

Embodiment 3

[0065] Carbon oxide nitride two-dimensional material self-assembled membrane prepared on tubular ceramic support for separation of water and C2-C4 alcohol mixture.

[0066] In the present embodiment, the steps of preparing carbon oxynitride by the hummer method are as follows: 1g of g-C 3 N 4 -0825 powder, add 45ml of concentrated sulfuric acid. Under the condition of ice bath, slowly add 3.5g potassium permanganate. The flask was immersed in a water bath at 40°C, and the reaction was stirred with a magnetic stirrer for 3 hours. Then, under the condition of ice bath, 200ml of water was slowly added into the flask, and 30% aqueous hydrogen peroxide was added into the flask until no more bubbles were produced. The obtained dispersion was centrifuged at 20,000 rpm for 1 hour. The resulting isolate was washed 3 times with deionized water to reach a pH of 7. Then vacuum dry at 50° C. for 12 h.

[0067] The preparation method of the carbon oxide nitride two-dimensional composi...

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Abstract

The invention discloses a method for preparing an oxidizing carbon nitride two-dimensional material composite film. The method comprises the following steps of (1) oxidizing the carbon nitride to obtain oxidizing carbon nitride, dispersing the oxidizing carbon nitride into a solvent, stripping into a flaky shape by ultrasonic waves, and forming oxidizing carbon nitride dispersion liquid; (2) mixing the oxidizing carbon nitride dispersion liquid and macromolecular film forming liquid to form composite film liquid; (3) forming the oxidizing carbon nitride two-dimensional material composite film at the surface of a porous carrier by an impregnating-drying method. The method for preparing the oxidizing carbon nitride two-dimensional material composite film has the advantages that the composite film with adjustable thickness and high mechanical strength can be prepared, and the good selection and separation effects are realized in the field of gas separation.

Description

technical field [0001] The invention relates to the technical field of chemical separation, in particular to a carbon nitride two-dimensional material composite membrane and a preparation method thereof. Background technique [0002] In the chemical industry, azeotropes with different proportions of short-chain low-boiling alcohols and water are often encountered, such as C2-C4 alcohols, such as isomers of ethanol, n-propanol, isopropanol and butanol, which are highly efficient and The separation of low energy consumption is one of the focuses of people's research. Meanwhile, for H 2 , N 2 , CO 2 , CH 4 Such as gas separation, separation of methanol in the preparation of low-carbon alcohols from synthesis gas, separation of methanol in the synthesis of dimethyl carbonate by urea method, and separation of methanol in the oxidation of methanol to methylal, which is beneficial to the recycling of methanol and the promotion of reactions. Going on helps a lot. The commonly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D71/38B01D71/70B01D61/36B01D67/00B01D69/12
CPCB01D61/362B01D61/366B01D67/0079B01D69/12B01D71/024B01D71/38B01D71/70
Inventor 曾高峰何晓帆李桂花戚本郁张延风孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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