Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials

A technology of composite photocatalysis and carbon quantum dots, applied in the field of photocatalysis, can solve the problems of high degradation rate and inability to degrade nitrogen oxides, etc., and achieve the effects of high degradation efficiency, cheap and easily available raw materials, and low synthesis cost.

Active Publication Date: 2016-05-25
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology

Patent CN103480353A uses vitamin C as a carbon source, water and ethanol as a mixed solvent, synthesizes carbon quantum dots by hydrothermal method, and mixes titanium dioxide powder with carbon quantum dot solution to obtain a composite photocatalyst. The degradation rate of the composite material to methylene blue is relatively low. High;

Method used

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  • Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials
  • Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials
  • Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials

Examples

Experimental program
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Effect test

Embodiment 1

[0028] a. Weigh 1.6g of ascorbic acid, add it to a mixed solution of 15mL ethylene glycol and 25mL deionized water, stir at room temperature for 30min, then react at 160°C for 70min to obtain an aqueous solution of carbon quantum dots;

[0029] b. Weigh 1.189g of Zn(NO 3 ) 2 ·6H2 O and 3.232g of Fe(NO 3 ) 3 9H 2 O, then add 20mL deionized water, stir until the solution is clear at room temperature;

[0030] c. adjust the pH value of the solution obtained in step b with a 2mol / L NaOH solution, so that the pH value reaches 13.0 to obtain a suspension;

[0031] d. Add 1 mL of the carbon quantum dot aqueous solution obtained in step a to the suspension obtained in the above step c;

[0032] e. After stirring evenly, let it stand for 1 day, then transfer it to a 100mL polytetrafluoroethylene liner, conduct a hydrothermal reaction at 100°C for 6 hours, wash it with deionized water and ethanol several times, and dry it at 70°C to obtain carbon quantum Dot / zinc ferrite composite...

Embodiment 2

[0034] a. Weigh 1.6g of ascorbic acid, add it to a mixed solution of 15mL ethylene glycol and 25mL deionized water, stir at room temperature for 30min, then react at 160°C for 70min to obtain an aqueous solution of carbon quantum dots;

[0035] b. Weigh 1.189g of Zn(NO 3 ) 2 ·6H 2 O and 3.232g of Fe(NO 3 ) 3 9H 2 O, then add 20mL deionized water, stir until the solution is clear at room temperature;

[0036] c. adjust the pH value of the solution obtained in step b with a 2mol / L NaOH solution, so that the pH value reaches 13.0 to obtain a suspension;

[0037] d. Add 3 mL of the carbon quantum dot aqueous solution obtained in step a to the suspension obtained in the above step c;

[0038] e. Stir for a period of time to mix evenly, then let it stand for 1 day, then transfer it to a 100mL polytetrafluoroethylene liner, conduct a hydrothermal reaction at 100°C for 6 hours, wash it with deionized water and ethanol for several times, and dry it at 70°C. A carbon quantum dot / ...

Embodiment 3

[0040] a. Weigh 1.6g of ascorbic acid, add it to a mixed solution of 15mL ethylene glycol and 25mL deionized water, stir at room temperature for 30min, then react at 160°C for 70min to obtain an aqueous solution of carbon quantum dots;

[0041] b. Weigh 1.189g of Zn(NO 3 ) 2 ·6H 2 O and 3.232g of Fe(NO 3 ) 3 9H 2 O, then add 20mL deionized water, stir until the solution is clear at room temperature;

[0042] c. adjust the pH value of the solution obtained in step b with a 2mol / L NaOH solution, so that the pH value reaches 13.0 to obtain a suspension;

[0043] d. Add 5 mL of step a obtained carbon quantum dot aqueous solution to the suspension obtained in the above step c;

[0044] e. Stir for a period of time to make the mixture even and let it stand for 1 day, then transfer it to a 100mL polytetrafluoroethylene liner, conduct a hydrothermal reaction at 100°C for 6 hours, wash it with deionized water and ethanol several times, and dry it at 70°C , to obtain carbon quant...

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Abstract

Provided is a preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials. Ascorbic acid is added into a mixed solution of ethylene glycol and deionized water and evenly stirred, reaction is performed for 1-5 h at the temperature of 100-200 DEG C, and a carbon quantum dot aqueous solution is obtained; zinc salt and Fe(NO3)3.9H2O are added into water, a pH value is adjusted to be 8-14 after dissolution, and suspension liquid is obtained; the carbon quantum dot aqueous solution is added into the suspension liquid, standing is performed after uniform stirring, hydrothermal reaction is performed for 4-10 h at the temperature of 80-180 DEG C, washing and drying are performed, and the carbon quantum dot/zinc ferrite composite photocatalytic materials are obtained. The raw materials are low in price, easy to obtain, the photocatalytic materials are low in synthesis cost, the method is easy to implement, and carbon quantum dot/zinc ferrite has higher degradation efficiency on NOx compared with pure zinc ferrite within the range of visible light.

Description

technical field [0001] The technical field of photocatalysis of the present invention particularly relates to a method for preparing a carbon quantum dot / zinc ferrite composite photocatalytic material. Background technique [0002] Nitrogen oxides (NO x ) as common air pollutants, including NO and NO 2 , is the greenhouse effect, acid rain, ozone hole, photochemical smog and PM 2.5 It is one of the main pollutants in the world, which is extremely harmful to the environment and will directly or indirectly cause harm to human health. At present, flue gas denitrification technology is mainly used in industry to achieve NO x emission standards. but NO x The concentration is relatively low in the air and cannot be effectively removed by traditional methods. The long-term accumulation of nitrogen oxides in the air will affect the air quality of human living environment, so it is urgent to effectively deal with this pollutant. The study found that the photocatalytic redox re...

Claims

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Application Information

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IPC IPC(8): B01J23/80B82Y30/00B01D53/86B01D53/56
CPCY02C20/10B01J23/80B01D53/8628B01D2258/06B01J35/0006B01J35/004B82Y30/00
Inventor 黄宇梁艳玲张朋曹军骥
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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