ZnO-C3N4-CQDs visible light catalytic composite material and preparation method thereof

A technology of zno-c3n4-cqds and composite materials, which is applied in chemical instruments and methods, separation methods, physical/chemical process catalysts, etc., can solve problems that affect wide application and non-response to visible light, and achieve easy industrial production and excellent electronics Effect of migration and reduction of production energy consumption

Inactive Publication Date: 2018-07-20
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

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 design and synthesis of ZnO-C 3 N 4 -CQDs and applied to catalytic degradation of organic pollutants under visible light

Method used

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  • ZnO-C3N4-CQDs visible light catalytic composite material and preparation method thereof
  • ZnO-C3N4-CQDs visible light catalytic composite material and preparation method thereof
  • ZnO-C3N4-CQDs visible light catalytic composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A ZnO-C 3 N 4 -The preparation method of CQDs visible photocatalysis composite material, concrete steps are as follows:

[0022] (1) Stir and mix zinc nitrate, CQDs aqueous solution, melamine and water according to the solid-to-liquid mass ratio of 1g: 12ml: 0.3g: 2g: 25ml, and adjust the pH value to 11 with ammonia water. The carbon quantum dot aqueous solution content is 5mg / ml;

[0023] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction. The specific steps of the reaction are to raise the temperature to 70°C at 4°C / min, keep it for 1h, and then rapidly raise the temperature to 210°C at 9°C / min , kept for 30min, and finally cooled to room temperature;

[0024] (3) Wash and dry in vacuum at 50°C for 12 hours to obtain ZnO-C 3 N 4 -CQDs visible light photocatalytic composites.

[0025] The preparation method of the carbon quantum dots is to put graphite rods into water, conduct continuous electrolysis at 3...

Embodiment 2

[0032] A ZnO-C 3 N 4 -The preparation method of CQDs visible photocatalysis composite material, concrete steps are as follows:

[0033] (1) Stir and mix zinc nitrate, CQDs aqueous solution, melamine and water according to the solid-to-liquid mass ratio of 1g: 10ml: 0.2g: 1g: 20ml, and adjust the pH value to 11 with ammonia water. The content of the aqueous solution of carbon quantum dots is 1 mg / ml;

[0034] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction. The specific steps of the reaction are to raise the temperature to 70°C at 4°C / min, keep it for 1h, and then rapidly raise the temperature to 200°C at 9°C / min , kept for 30min, and finally cooled to room temperature;

[0035] (3) Wash and dry in vacuum at 50°C for 12 hours to obtain ZnO-C 3 N 4 -CQDs visible light photocatalytic composites.

[0036] The preparation method of the carbon quantum dots is to put graphite rods into water, conduct continuous elect...

Embodiment 3

[0039] A ZnO-C 3 N 4 -The preparation method of CQDs visible photocatalysis composite material, concrete steps are as follows:

[0040] (1) Stir and mix zinc nitrate, CQDs aqueous solution, melamine and water according to the solid-to-liquid mass ratio of 1g: 15ml: 0.5g: 4g: 30ml, and adjust the pH value to 11 with ammonia water. The content of the aqueous solution of carbon quantum dots is 10 mg / ml;

[0041] (2) Transfer the above solution to a reaction kettle lined with tetrafluoroethylene for hydrothermal reaction. The specific steps of the reaction are to raise the temperature to 70°C at 4°C / min, keep it for 1h, and then rapidly raise the temperature to 220°C at 9°C / min , kept for 30min, and finally cooled to room temperature;

[0042] (3) Wash and dry in vacuum at 50°C for 12 hours to obtain ZnO-C 3 N 4 - CQDs visible light photocatalytic composites.

[0043] The preparation method of the carbon quantum dots is to put graphite rods into water, conduct continuous ele...

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Abstract

The invention provides a ZnO-C3N4-carbon quantum dots (CQDs) visible light catalytic composite material and a preparation method thereof. The CQDs have the excellent electronic storage capacity and upconversion fluorescence performance and can form water solubility protection on the surface of a material, the ZnO has the excellent electron transmission, and the C3N4 has the excellent electron transfer, the CQDs and the C3N4 can be stably aggregated on the surface of the ZnO to form a stable three-phase structure through similar conjugated structures of the CQDs and the C3N4, benzene is conveniently enriched on the surface of the composite material through the Pi-Pi interaction between the conjugated structure of the CQDs and the benzene, so an organic gas pollutant can be efficiently degraded under visible light through the synergistic effect of three parties (the degradation efficiency of the benzene can be up to 89%). The uniformly covered ZnO-C3N4-CQDs composite material can be formed by performing a high-pressure hydrothermal reaction through a progressive heating method.

Description

technical field [0001] The technical field of preparation of carbon-based composite materials of the present invention, especially relates to a kind of ZnO-C 3 N 4 - Carbon quantum dots (CQDs) visible light catalytic composite material and its preparation method. 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 are a new member of the family of carbon nanomaterials. They have the characteristics of wide absorption spectrum, good photobleaching resistance, non-toxicity, easy functionalization, and high-yield preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72
CPCB01J27/24B01D53/8668B01J35/004
Inventor 于香斌
Owner 苏州宝澜环保科技有限公司
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