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Preparation of carbon quantum dot supported TiO2 nano-composite material, and application thereof in photocatalytic reduction of CO2

A technology of nanocomposite materials and carbon quantum dots, which is applied in the field of photocatalytic reduction of CO2, and can solve problems such as photocatalytic performance limitations

Inactive Publication Date: 2019-04-02
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiO 2 There is a corresponding disadvantage that it has a wider band gap (such as the anatase phase of TiO 2 , its forbidden band width is 3.2eV, and the forbidden band width of rutile phase is 3.0eV), and it can only absorb ultraviolet light with a wavelength less than 420nm. Various reasons lead to its photocatalytic performance is greatly limited

Method used

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  • Preparation of carbon quantum dot supported TiO2 nano-composite material, and application thereof in photocatalytic reduction of CO2
  • Preparation of carbon quantum dot supported TiO2 nano-composite material, and application thereof in photocatalytic reduction of CO2
  • Preparation of carbon quantum dot supported TiO2 nano-composite material, and application thereof in photocatalytic reduction of CO2

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Synthesis of CQDs: Take 2.5g of glucose and dissolve it in 10mL of deionized water with stirring, and heat the mixture in a microwave oven on high heat for 5min. After the reaction is completed, viscous orange-yellow CQDs are obtained, and 10mL of deionized water is added to it Diluted into CQDs solution.

[0035] (2) CQDs / TiO 2 Synthesis of nanocomposites: Take 5 mL of the CQDs solution synthesized above, add 50 mL of deionized water, and add 5 mL of tetrabutyl titanate, stir for 1 h, transfer to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene, and control the temperature It was reacted at 110°C for 24 hours; after the reaction, the mixture was cooled to room temperature, washed several times with deionized water, dried in an oven at 60°C for 12 hours, and the dried sample was ground to obtain CQDs / TiO 2 (5) Nanocomposite materials.

[0036] Photochemical performance test: CQDs / TiO 2 (5) CO for photocatalytic reduction 2 , the production r...

Embodiment 2

[0038] (1) Synthesis of CQDs: 2.5g of glucose was fully dissolved in 10mL of deionized water with stirring, and the mixture was heated in a microwave oven on high heat for 5min to obtain viscous orange-yellow CQDs; 10mL of deionized water was added to it to dilute into CQDs solution.

[0039] (2) CQDs / TiO 2 Synthesis of nanocomposites: Take 3mL of the above CQDs solution, add 50mL of deionized water, and add 5mL of tetrabutyl titanate, stir for 1h, transfer the mixture to a 100mL stainless steel autoclave lined with polytetrafluoroethylene, The reaction temperature was controlled at 110°C for 24 hours; after the reaction, the mixture was cooled to room temperature, washed several times with deionized water, dried in an oven at 60°C for 12 hours, and the dried sample was ground to obtain CQDs / TiO 2 (3) Nanocomposite materials.

[0040] Photochemical performance test: CQDs / TiO 2 (3) CO for photocatalytic reduction 2 , the production rate of CO was 5.2 μmol / g.

Embodiment 3

[0042] (1) Synthesis of CQDs: 2.5g of glucose was fully dissolved in 10mL of deionized water with stirring, and the mixture was heated in a microwave oven on high heat for 5min. After the reaction was completed, viscous orange-yellow CQDs were obtained, and 10mL of deionized water was added to it. Diluted into CQDs solution.

[0043] (2) CQDs / TiO 2 Synthesis of nanocomposites: Take 4 mL of the CQDs solution synthesized above, add 50 mL of deionized water, and add 5 mL of tetrabutyl titanate, stir for 1 h, transfer to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene, and control the temperature It was reacted at 110°C for 24 hours; after the reaction, the mixture was cooled to room temperature, washed several times with deionized water, dried in an oven at 60°C for 12 hours, and the dried sample was ground to obtain CQDs / TiO 2 (4) Nanocomposite materials.

[0044] Photochemical performance test: CQDs / TiO 2 CO for photocatalytic reduction 2 , the product...

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Abstract

The invention discloses a preparation method of a carbon quantum dot supported TiO2 nano-composite material (CQDs / TiO2). The method includes: dissolving glucose in deionized water and placing the solution in a microwave oven to heat the solution, on high fire, for 3-6 min; after the reaction is finished, adding deionized water to the mixture and uniformly stirring the mixture for dilution to obtain a carbon quantum dot solution; then adding deionized water and tetrabutyl titanate to the carbon quantum dot solution to perform hydrothermal reaction, after the reaction is finished, washing the product with deionized water, and drying the product to prepare the CQDs / TiO2 nano-composite material. In the method, CQDs are supported on the TiO2 through the hydrothermal reaction; by introducing theCQDs, absorption range on visible light of the TiO2 is enlarged. The product, when being used in photocatalytic reduction of CO2, is high in yield of CO, maximum yield reaching 43 [mu]mol / g*h.

Description

technical field [0001] The invention relates to a carbon quantum dot supported titanium dioxide nanocomposite material (CQDs / TiO 2 ) preparation method of nanocomposites, mainly for photocatalytic reduction of CO 2 in response. Background technique [0002] In recent years, with the rapid development of industry, the demand and consumption of energy have gradually increased, which eventually lead to energy shortage and many environmental problems. The burning of fossil fuels, along with the increase in the level of carbon dioxide in the atmosphere, further contributes to the greenhouse effect. However, how to solve this environmental problem faster and more efficiently has attracted the attention of many researchers. With the increasing maturity of semiconductor photocatalysis technology, the generation of favorable gases such as methane and carbon monoxide by photocatalytic reduction of carbon dioxide has attracted great interest, thereby realizing the utilization of sol...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J37/10C01B32/40
CPCC01B32/40B01J21/18B01J37/10B01J35/39
Inventor 佘厚德马晓玉周华王龙龙苏碧桃王其召王磊黄静伟
Owner NORTHWEST NORMAL UNIVERSITY
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