Cellulose nanofibril airgel loaded with photocatalyst and preparation method thereof

A technology of nanofibrils and photocatalysts, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems affecting photocatalytic performance, difficulty in recycling, and easy aggregation of nanomaterials. It achieves the effect of being conducive to recycling, good light transmission performance, and stable network structure

Active Publication Date: 2019-05-28
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the heterogeneous modification process, nanomaterials are easy to agglomerate, which seriously affects their photocatalytic performance.
At the same time, powdery nano photocatalyst materials are difficult to recycle and reuse, and their recyclability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An embodiment of the cellulose nanofibril airgel loaded with photocatalyst and the preparation method thereof of the present invention, wherein the preparation method of the airgel comprises the following steps:

[0036] (1) Weigh 0.01mol of Bi(NO 3 ) 3 .5H 2 O is dissolved in 100ml of cellulose nanofibril suspensions with a mass fraction of 0.8wt% (the aspect ratio of cellulose nanofibrils is 100-2000), and the solution is ultrasonicated for 1 minute with an ultrasonic cell pulverizer, and the ultrasonic power is 200W , ultrasonic 5 seconds / interval 5 seconds, so that Bi(NO 3 ) 3 .5H 2 O was fully dissolved in the cellulose nanofibril suspension to obtain a mixed solution.

[0037] (2) Vacuum freeze-drying the mixed solution obtained above to prepare cellulose nanofibril airgel loaded with bismuth ions.

[0038] (3) 0.005 mol of KBr and 0.005 mol of KCl were weighed and dissolved in 100 ml of deionized water, and fully stirred to prepare a KBr / KCl mixed solution....

Embodiment 2

[0043] An embodiment of the cellulose nanofibril airgel loaded with photocatalyst and the preparation method thereof of the present invention, wherein the preparation method of the airgel comprises the following steps:

[0044] (1) Weigh 0.02mol of Bi(NO 3 ) 3 .5H 2 O is dissolved in 100 ml of cellulose nanofibril suspension with a mass fraction of 1.0 wt % (the aspect ratio of cellulose nanofibril is 100-2000). Sonicate the solution with an ultrasonic cell disruptor for 1 minute, the ultrasonic power is 200W, and the ultrasonic wave is 5 seconds / interval 5 seconds, so that the Bi(NO 3 ) 3 .5H 2 O was fully dissolved in the cellulose nanofibril suspension to obtain a mixed solution.

[0045] (2) Vacuum freeze-drying the mixed solution obtained above to prepare cellulose nanofibril airgel loaded with bismuth ions.

[0046] (3) 0.01 mol of KBr and 0.01 mol of KCl were weighed and dissolved in 100 ml of deionized water, and fully stirred to prepare a KBr / KCl mixed solution....

Embodiment 3

[0051] An embodiment of the cellulose nanofibril airgel loaded with photocatalyst and the preparation method thereof of the present invention, wherein the preparation method of the airgel comprises the following steps:

[0052] (1) Weigh 0.05mol of Bi(NO 3 ) 3 .5H 2 O is dissolved in 100 ml of cellulose nanofibril suspension with a mass fraction of 1.0 wt % (the aspect ratio of cellulose nanofibril is 100-2000). Sonicate the solution with an ultrasonic cell disruptor for 1 minute, the ultrasonic power is 200W, and the ultrasonic wave is 5 seconds / interval 5 seconds, so that the Bi(NO 3 ) 3 .5H 2 O was fully dissolved in the cellulose nanofibril suspension to obtain a mixed solution.

[0053] (2) Vacuum freeze-drying the mixed solution obtained above to prepare cellulose nanofibril airgel loaded with bismuth ions.

[0054] (3) 0.02 mol of KBr and 0.03 mol of KCl were weighed and dissolved in 100 ml of deionized water, and fully stirred to prepare a KBr / KCl mixed solution....

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Abstract

The invention discloses a cellulose nanofibril aerogel loaded with a photocatalyst and a preparation method thereof. The preparation method comprises the steps of: (1) dissolving bismuth nitrate in a cellulose nanofibril suspension liquid, and mixing the substances evenly to obtain a mixed solution; (2) drying the mixed solution obtained in step (1) to obtain cellulose nanofibril aerogel loaded with bismuth ions; (3) dissolving a soluble bromide salt and a soluble chloride salt in deionized water, stirring the substances fully to obtain a halide salt solution; and (4) impregnating the cellulose nanofibril aerogel loaded with bismuth ions obtained in step (2) in the halide salt solution obtained in step (3), then taking the cellulose nanofibril aerogel out for drying, and conducting calcinations, thus obtaining the cellulose nanofibril aerogel loaded with the photocatalyst. The aerogel can achieve catalytic degradation of organic matters under visible light, also has high light utilization rate and good photocatalytic effect, and the nano-photocatalytic material is easy for recycling.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials for air purification, in particular to a cellulose nanofibril aerogel loaded with a photocatalyst and a preparation method thereof. Background technique [0002] In recent years, the pollution gas emitted by the rapid development of industry, the emission of automobile exhaust, and the formaldehyde and phenol produced by the use of urea-formaldehyde resin adhesives and phenolic resin adhesives have made air pollution more and more serious. A large number of harmful organic substances such as phenol, formaldehyde, and toluene seriously endanger human health. Therefore, it is of great significance to find efficient and environmentally friendly methods to remove organic pollutants in the air. [0003] With the development of science and technology, catalysts play a huge role in solving energy and environmental problems. Among them, the photocatalytic degradation of organic matter h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06B01J37/02B01D53/86B01D53/72
CPCB01D53/8668B01D2258/06B01J27/06B01J35/004B01J35/0073B01J37/0201
Inventor 卿彦吴义强田翠花李贤军李新功易佳楠
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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