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ZnO-based photocatalytic composite material and preparation method thereof

A composite material, light-based technology, applied in chemical instruments and methods, separation methods, catalysts for physical/chemical processes, etc. The effect of mild thermal reaction, excellent electron storage ability, and excellent photocatalytic performance

Inactive Publication Date: 2018-08-10
苏州宝澜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to its large forbidden band width, ZnO does not respond to visible light, which affects its wide application in the field of photocatalysis.
As far as we know, there is no report on the use of CQDs aqueous solution to participate in the reaction and post-treatment product design and synthesis of ZnO-CQDs and its application in the catalytic degradation of organic pollutants under visible light.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a ZnO-based visible light-catalyzed composite material, the specific steps are as follows:

[0020] (1) Stir and mix zinc nitrate, CQDs aqueous solution and water according to the solid-liquid mass ratio of 1g: 12ml: 25ml, and adjust the pH value to 11 with ammonia water. The carbon quantum dot aqueous solution content is 5mg / ml;

[0021] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction, react at 210°C for 1.5h, and finally cool to room temperature;

[0022] (3) The specific steps of using the CQDs aqueous solution to post-treat the product are to put the solid product after the hydrothermal reaction into the CQDs aqueous solution with a content of 7mg / ml according to the solid-to-liquid ratio of 1g: 10ml, and then vigorously stir at 85°C for 2h .

[0023] (4) The stirred product was washed and vacuum-dried at 50° C. for 12 hours to obtain the ZnO-CQDs visible photocatalytic composite...

Embodiment 2

[0030] A preparation method of a ZnO-based visible light-catalyzed composite material, the specific steps are as follows:

[0031] (1) Stir and mix zinc nitrate, CQDs aqueous solution and water according to the solid-to-liquid mass ratio of 1g: 10ml: 20ml, and adjust the pH value to 11 with ammonia water. The content of the carbon quantum dot aqueous solution is 1mg / ml;

[0032] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction, react at 200°C for 1 hour, and finally cool to room temperature;

[0033] (3) The specific steps of using the CQDs aqueous solution to post-treat the product are to put the solid product after the hydrothermal reaction into the CQDs aqueous solution with a content of 5mg / ml according to the solid-to-liquid ratio of 1g: 10ml, and then vigorously stir at 80°C for 1h .

[0034] (4) The stirred product was washed and vacuum-dried at 50° C. for 12 hours to obtain the ZnO-CQDs visible photocatalyt...

Embodiment 3

[0038] A preparation method of a ZnO-based visible light-catalyzed composite material, the specific steps are as follows:

[0039] (1) Stir and mix zinc nitrate, CQDs aqueous solution and water according to the solid-to-liquid mass ratio of 1g: 15ml: 30ml, and adjust the pH value to 11 with ammonia water. The content of the carbon quantum dot aqueous solution is 10mg / ml;

[0040] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction, react at 220°C for 2 hours, and finally cool to room temperature;

[0041] (3) The specific steps of using the CQDs aqueous solution to post-treat the product are to put the solid product after the hydrothermal reaction into the CQDs aqueous solution with a content of 10mg / ml according to the solid-to-liquid ratio of 1g: 10ml, and then vigorously stir at 90°C for 3h .

[0042] (4) The stirred product was washed and vacuum-dried at 50° C. for 12 hours to obtain the ZnO-CQDs visible photocata...

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Abstract

The invention provides a ZnO-based photocatalytic composite material and a preparation method thereof. The ZnO-based photocatalytic composite material is based on carbon quantum dots (CQDs), has excellent electron storage capacity and up-conversion fluorescence performance, and can form water-soluble protection on the surface of the material so as to avoid agglomeration of zinc oxide nanostructures during preparation; ZnO has excellent electron transport property; after a CQDs aqueous solution is used for post-treatment of the product, a stable CQDs protection and fluorescence conversion layeris formed on the surface of ZnO, the carrier separation and transmission of the composite material can be better improved during a photocatalytic reaction, and the recombination rate of a carrier isreduced after separation; furthermore, the pi-pi interaction between a conjugated structure of the CQDs and benzene is beneficial to the enrichment of the benzene on the surface of the composite material; the CQDs and the benzene can efficiently degrade organic gas pollutants under visible light due to a synergistic effect (the degradation efficiency of the benzene can reach 90%).

Description

technical field [0001] The invention relates to the technical field of carbon-based composite material preparation, in particular to a ZnO-based photocatalytic composite material and a preparation method thereof. Background technique [0002] Due to its green sustainability, photocatalytic technology has attracted widespread attention of scientists in environmental pollution control and other aspects; however, the large band gap and ultraviolet response of many photocatalytic materials have greatly hindered its development, and it is impossible to achieve large-scale Therefore, it is of great practical significance to develop new photocatalysts with high-efficiency visible light response. [0003] Carbon quantum dots (CQDs) are a new member of the family of carbon nanomaterials, which are non-toxic, high fluorescence quantum yield, good biocompatibility, high light and chemical stability, etc., and can be used in biosensing, bioimaging, Environmental detection, photocatalys...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/00B01D53/86B01D53/72
CPCB01D53/8668B01J23/06B01D2257/7027B01J35/39
Inventor 于香斌
Owner 苏州宝澜环保科技有限公司
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