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A kind of preparation method of carbon quantum dot/zinc oxide visible light catalyst

A technology of carbon quantum dots and zinc oxide, applied in the field of visible light catalytic material preparation and application, can solve the problems of low solar energy utilization efficiency, poor visible light catalytic performance, etc., and achieve the effect of improving visible light catalytic performance, improving visible light catalytic performance, and high efficiency

Active Publication Date: 2022-04-29
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The traditional photocatalytic material ZnO is cheap and easy to obtain, and has strong oxidation ability. However, as a wide bandgap semiconductor (~3.2eV), it can only absorb ultraviolet light with a wavelength less than 387nm, and has low solar energy utilization efficiency and poor visible light catalytic performance.

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  • A kind of preparation method of carbon quantum dot/zinc oxide visible light catalyst
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  • A kind of preparation method of carbon quantum dot/zinc oxide visible light catalyst

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preparation example Construction

[0023] The preparation method of a kind of carbon quantum dot / zinc oxide visible light catalyst of the present invention comprises the following steps:

[0024] (1) Preparation of carbon quantum dots:

[0025] Dissolve citric acid and urea in deionized water, stir evenly, and then transfer it to the reaction tube. Under the action of 500-750W, microwave hydrothermal reaction at 100-160°C for 2-30min, and naturally cool to room temperature to obtain carbon Quantum dot solution. Wherein, the concentrations of citric acid and urea in the deionized water are 0.1-5 mol / L and 1-10 mol / L respectively.

[0026] (2) Preparation of carbon quantum dots / zinc oxide:

[0027] Dissolve zinc salt and urea in deionized water, mix well to obtain a mixed aqueous solution, then add carbon quantum dot solution to the mixed aqueous solution, stir at room temperature for 10-90 minutes, transfer it to the reaction tube, and turn it into a reaction tube at a power of 500-850W Under the action of mi...

Embodiment 1

[0030] Transfer the aqueous solution of 0.1mol / L citric acid and 2mol / L urea into the reaction tube, under the action of 500W power, microwave hydrothermal reaction at 120°C for 15min, and naturally cool to room temperature to obtain the carbon quantum dot solution;

[0031] Add 1mL carbon quantum dot solution to 10mL aqueous solution of 2mol / L zinc nitrate and 0.1mol / L urea, stir at room temperature for 60min, then transfer to reaction tube, under the action of 500W power, microwave hydrothermal reaction at 100℃ for 60min, Naturally cooled to room temperature, washed with deionized water and ethanol respectively, and dried at 60°C to obtain carbon quantum dots / zinc oxide (CQDs / ZnO-1).

Embodiment 2

[0033] Transfer the aqueous solution of 5 mol / L citric acid and 6 mol / L urea into the reaction tube, under the power of 600W, conduct microwave hydrothermal reaction at 100°C for 30 minutes, and naturally cool to room temperature to obtain the carbon quantum dot solution;

[0034] Add 0.2mL carbon quantum dot solution to 50mL aqueous solution of 0.05mol / L zinc acetate and 5mol / L urea, stir at room temperature for 30min, transfer to the reaction tube, under the action of 750W power, microwave hydrothermal reaction at 140℃ for 30min , cooled naturally to room temperature, washed with deionized water and ethanol respectively, and dried at 80°C to obtain carbon quantum dots / zinc oxide (CQDs / ZnO-2).

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Abstract

A method for preparing a carbon quantum dot / zinc oxide visible light catalyst. The aqueous solution of citric acid and urea is transferred into a reaction tube, under the action of a power of 500-750W, microwave hydrothermal reaction at 100-160°C for 2-30min, and naturally cooled to At room temperature, get the carbon quantum dot solution; add the carbon quantum dot solution to the aqueous solution of zinc salt and urea, stir evenly, then transfer to the reaction tube, under the action of power 500-850W, microwave hydrothermal reaction at 100-200℃ for 5-60min , naturally cooled to room temperature, washed and dried to obtain carbon quantum dots / zinc oxide (CQDs / ZnO) visible light catalyst. The carbon quantum dot / zinc oxide prepared by the invention can effectively remove NO pollutants under the irradiation of visible light, and the synthesis method is simple, fast and low in cost, which is beneficial to scale-up production and has good application prospects.

Description

technical field [0001] The invention belongs to the field of preparation and application of visible light catalytic materials, and relates to a preparation method of a carbon quantum dot / zinc oxide visible light catalyst. Background technique [0002] In recent years, haze pollution has become a major atmospheric environmental problem in my country. NO x As one of the important precursors of secondary organic aerosol (SOA) in heavy haze pollution, its typical characteristics are low concentration (ppb level) and difficult removal. Therefore, green and efficient air purification technology is very important. Compared with traditional removal methods such as physical adsorption and biological filtration, semiconductor photocatalysis technology has the advantages of low energy consumption, low cost and high efficiency, and is widely used in the field of air pollution control. [0003] The traditional photocatalytic material ZnO is cheap and easy to obtain, and has strong oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01D53/86B01D53/56
CPCB01J23/06B01D53/8628B01J35/39
Inventor 黄宇刘燕王震宇曹军骥
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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