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A three-dimensional porous g-c3n4/c airgel based on cellulose and its preparation method

A cellulose airgel, three-dimensional porous technology, applied in the direction of carbon preparation/purification, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of difficult recycling, secondary pollution, etc., and achieve low cost, The effect of uniform pore size and simple operation

Active Publication Date: 2019-01-29
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the g-C prepared by the existing research 3 N 4 It mostly exists in powder state, it is difficult to recycle, and it is easy to cause secondary pollution

Method used

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  • A three-dimensional porous g-c3n4/c airgel based on cellulose and its preparation method
  • A three-dimensional porous g-c3n4/c airgel based on cellulose and its preparation method
  • A three-dimensional porous g-c3n4/c airgel based on cellulose and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of cellulose airgel: Dissolve 2g of cellulose powder in a pre-cooled sodium hydroxide / urea / water mixed solution with a mass ratio of 7:12:81 at -12°C, and stir vigorously to obtain a concentration of 2wt % cellulose solution; then add 1.5 g of cross-linking agent N, N'-methylenebisacrylamide, stir at room temperature for 30 minutes to carry out chemical cross-linking, wash with water and then freeze-dry to obtain cellulose airgel.

[0029] (2) Three-dimensional porous g-C 3 N 4 Preparation of / C airgel: Pour 5g of melamine into 300mL deionized water and stir to obtain a melamine suspension, then immerse the cellulose airgel prepared in step (1) in the melamine suspension, and then squeeze and absorb the suspension Melamine in the turbid liquid was freeze-dried or oven-dried at 60°C to obtain cellulose aerogels loaded with melamine; finally, the cellulose aerogels loaded with melamine was placed in a tube furnace, under the protection of argon, to The t...

Embodiment 2

[0032] (1) Preparation of cellulose airgel: Dissolve 4g of absorbent cotton in a pre-cooled sodium hydroxide / urea / water mixed solution with a mass ratio of 7:12:81 at -12°C, and stir vigorously to obtain a cellulose airgel with a concentration of 4wt%. Cellulose solution; then add 0.6 g of cross-linking agent N, N'-methylenebisacrylamide, stir at room temperature for 30 minutes to carry out chemical cross-linking, wash with water and then freeze-dry to obtain cellulose airgel.

[0033] (2) Three-dimensional porous g-C 3 N 4 Preparation of / C airgel: Pour 15g of melamine into 300mL deionized water and stir to obtain a melamine suspension, then immerse the cellulose airgel prepared in step (1) in the melamine suspension, and squeeze and absorb the suspension Melamine in the turbid liquid was freeze-dried or oven-dried at 60°C to obtain cellulose aerogels loaded with melamine; finally, the cellulose aerogels loaded with melamine was placed in a tube furnace, under the protection...

Embodiment 3

[0036](1) Preparation of cellulose airgel: Dissolve 4.5g of pulp pulp in a pre-cooled sodium hydroxide / urea / water mixed solution with a mass ratio of 7:12:81 at -12°C, stir vigorously to obtain a concentration of 4.5 wt% cellulose solution; then add 1.0 g of cross-linking agent N, N'-methylenebisacrylamide, stir at room temperature for 30 minutes to carry out chemical cross-linking, wash with water and then freeze-dry to obtain cellulose airgel.

[0037] (2) Three-dimensional porous g-C 3 N 4 Preparation of / C airgel: Pour 10g of melamine into 300mL deionized water and stir to obtain a melamine suspension, then immerse the cellulose airgel prepared in step (1) in the melamine suspension, and squeeze and absorb the suspension Melamine in the turbid liquid was freeze-dried or oven-dried at 60°C to obtain cellulose aerogels loaded with melamine; finally, the cellulose aerogels loaded with melamine was placed in a tube furnace, under the protection of argon, to Heat up to 550°C ...

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Abstract

The invention discloses a cellulose based three dimensional porous g-C3N4 / C aerogel and a preparation method thereof. Cellulose is taken as the raw material and is dissolved by a mixed solution of sodium hydroxide, urea, and water to obtain a cellulose solution. The cellulose solution is subjected to simple chemical crosslinking to prepare cellulose aerogel. Then melamine is loaded on the cellulose aerogel through an extrusion adsorption method. Then cellulose aerogel is converted into carbon aerogel by a high temperature calcination method. At the same time, melamine is converted into graphite phase carbon nitride, which is deposited on the carbon aerogel through vapor deposition to form the g-C3N4 / C aerogel with a three dimensional porous structure. The preparation process is simple, the production cost is low, the obtained three dimensional porous g-C3N4 / C aerogel is easy to recover and use, and moreover, the obtained aerogel has a uniform pore size and a large specific surface, and can be applied to photocatalytic organic pollutant degradation.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a cellulose-based three-dimensional porous g-C 3 N 4 / C airgel and its preparation method. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) is a metal-free organic semiconductor material with a bandgap of about 2.7eV, high theoretical specific surface area, and adjustable electronic structure, which has attractive application prospects in the field of photocatalysis. In addition, g-C 3 N 4 With good chemical inertness, thermal stability, and biocompatibility, it is possible to replace graphitic carbon materials in various material science applications. These excellent properties enable it to be used in nitrogen sources for the synthesis of metal nitrides, catalysts, photocatalysts, catalyst supports, high-performance wear-resistant coatings, and the like. [0003] High-temperature self-polymerization of cyanamide (dipolycyanamide or m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B21/082C01B32/05
CPCB01J27/24B01J35/004B01J35/1014B01J37/08B01J37/084C01B21/0605C01P2002/72C01P2002/84C01P2004/03C01P2006/12C01P2006/17
Inventor 刘琳钱周琦姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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