CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst for CO2 reduction and preparation method of CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst

A technology of quantum dots and composite light, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., and can solve the problem of high photocatalytic reaction rate and visible light band light absorption performance , cost increase, application scene limitations and other issues, to achieve the effect of excellent visible light absorption performance, low cost, and excellent photocatalytic performance

Active Publication Date: 2021-07-23
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the widely used CO 2 Reduced photocatalysts such as TiO 2 , g-C 3 N 4 , CdS, CdSe, etc. still have certain shortcomings, that is, it is difficult for them to achieve high photocatalytic reaction rate and good light absorption performance in the visible light band at the same time.
Therefore, these materials must rely on artificial ultraviolet light as a light source when working, resulting in an increase in cost and limitations in application scenarios
This shortcoming will undoubtedly restrict the photocatalytic CO 2 Practical application and future development of reduction technology

Method used

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  • CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst for CO2 reduction and preparation method of CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst
  • CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst for CO2 reduction and preparation method of CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst
  • CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst for CO2 reduction and preparation method of CsPbBr3 quantum dot/nano CuCo2O4 composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Nano CuCo 2 o 4 The preparation method comprises the following steps:

[0035] (A1) 1mmol of Cu(NO 3 ) 2 .6H 2 O, 2mmol of Co(NO 3 ) 2 .6H 2 O, 5mmol of CH 4 N 2 O and 2 mmol of NH 4 F was dissolved in 30-60mL of ethanol, stirred at room temperature for 60min, stirred evenly and fully mixed, then transferred to a 100mL tetrafluoroethylene-lined stainless steel autoclave, placed in a vacuum drying oven, the drying temperature was 200°C, and the drying time was for 12h;

[0036] (A2) After washing the product obtained in step (A1) alternately with distilled water and ethanol for multiple times, place it in an oven for drying, the drying temperature is 80° C., and the drying time is 8 hours;

[0037] (A3) Calcining the product obtained in step (A2), the calcination temperature is 400°C, the calcination time is 2h, the heating rate of calcination is 5°C / min, and after cooling to room temperature, grind it in a mortar for 30min , and then add 2mL n-hexane to ultr...

Embodiment 2

[0046] Nano CuCo 2 o 4 The preparation method comprises the following steps:

[0047] (A1) 0.5mmol of Cu(NO 3 ) 2 .6H 2 O, 1mmol of Co(NO 3 ) 2 .6H 2 O, 2.5 mmol of CH 4 N 2 O and 1 mmol of NH 4 F was dissolved in 50mL of ethanol, stirred at room temperature for 30min, stirred evenly and fully mixed, then transferred to a 100mL tetrafluoroethylene-lined stainless steel autoclave, placed in a vacuum drying oven, the drying temperature was 180°C, and the drying time was 16h;

[0048] (A2) After washing the product obtained in step (A1) alternately with distilled water and ethanol several times, place it in an oven and dry it at a temperature of 100° C. for 10 hours;

[0049] (A3) Calcining the product obtained in step (A2), the calcination temperature is 450°C, the calcination time is 3h, the heating rate of the calcination is 4°C / min, after cooling to room temperature, grind it in a mortar, and the grinding time is 60min , and then add 10mL of n-hexane for ultrasonic...

Embodiment 3

[0058] Nano CuCo 2 o 4 The preparation method comprises the following steps:

[0059] (A1) 0.2mmol of Cu(NO 3 ) 2 .6H 2 O, 0.4mmol of Co(NO 3 ) 2 .6H 2 O, 1 mmol of CH 4 N 2 O and 0.4 mmol of NH 4 F was dissolved in 40mL of ethanol, stirred at room temperature for 20min, stirred evenly and fully mixed, then transferred to a 100mL tetrafluoroethylene-lined stainless steel autoclave, placed in a vacuum drying oven, the drying temperature was 160°C, and the drying time was 10h;

[0060] (A2) After washing the product obtained in step (A1) alternately with distilled water and ethanol several times, place it in an oven for drying at a drying temperature of 80° C. for 12 hours;

[0061] (A3) Calcining the product obtained in step (A2), the calcination temperature is 300°C, the calcination time is 4h, the heating rate of calcination is 3°C / min, and after cooling to room temperature, grind it in a mortar, and the grinding time is 20min , and then add 5mL n-hexane for ultras...

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Abstract

The invention relates to a CsPbBr3 quantum dot / nano CuCo2O4 composite photocatalyst for CO2 reduction, the CsPbBr3 quantum dot / nano CuCo2O4 composite photocatalyst comprises CsPbBr3 quantum dots and nano CuCo2O4, and the ratio of the CsPbBr3 quantum dots to the nano CuCo2O4 is (0.2-2) mmol: (4-40) mg; and the invention further relates to a preparation method of the CsPbBr3 quantum dot / nano CuCo2O4 composite photocatalyst for CO2 reduction. The CsPbBr3 quantum dot / nano CuCo2O4 composite photocatalyst has the advantages of being high in visible light utilization rate and excellent in photocatalytic performance, CsPbBr3 quantum dots and nano CuCo2O4 are compounded through continuous ultrasonic treatment, sound waves of high-frequency vibration are transmitted to the surfaces of the CsPbBr3 quantum dots and the surfaces of the nano CuCo2O4, atoms on the surface layers of the CsPbBr3 quantum dots and the surfaces of the nano CuCo2O4 rub against one another, the key point of the method lies in the combination of atomic layers on the surfaces of the two materials, so that the CsPbBr3 quantum dots embedded into the CuCo2O4 nanosheets are not easy to fall off; the method does not involve chemical reaction, so that other impurities are not introduced; and the method is simple in process, good in reproducibility and low in cost, and meets environmental requirements.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and preparation methods thereof, in particular to a 2 Reduced-CsPbBr 3 Quantum dots / nano CuCo 2 o 4 Composite photocatalyst and preparation method thereof. Background technique [0002] With the gradual increase in energy demand in modern society, fossil energy is slowly being exhausted at an increasing rate year by year. At the same time, the combustion of fossil energy is accompanied by a large amount of CO 2 The release of carbon dioxide has brought serious greenhouse effect to the world. Although the current industrial carbon dioxide recovery and separation technology is relatively mature, compared with the huge annual emission of carbon dioxide, the proportion of industrial recovery of carbon dioxide is relatively small. In addition, industrial carbon dioxide recovery and separation technology is generally only suitable for large-scale waste gas recovery and treatment with high ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J23/75B01J37/34C01G21/00C01B32/40
CPCB01J27/135B01J23/75B01J23/002B01J35/004B01J35/0013B01J37/343C01G21/00C01B32/40C01P2002/72C01P2004/64C01P2004/04C01P2006/60
Inventor 刘曰利缪国斌陈文张玉瑶
Owner WUHAN UNIV OF TECH
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