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.
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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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PUM

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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
CPCB01J23/06B01D53/8668B01D2257/7027B01J35/004
Inventor 于香斌
Owner 苏州宝澜环保科技有限公司
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