A kind of carbon quantum dot/titanium dioxide composite photocatalytic material and its preparation method and application

A composite photocatalysis and titanium dioxide technology, applied in the field of environmental photocatalysis, can solve problems such as difficult and uniform loading, and achieve the effects of increasing contact probability, improving efficiency, and improving adsorption

Active Publication Date: 2020-06-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In view of the above problems, the object of the present invention is to provide a carbon quantum dot / titanium dioxide composite photocatalytic material and its preparation method and application, to solve the problem of difficult uniform loading of carbon quantum dots on titanium dioxide, simplify the preparation process, prepare uniform loading, and firmly bond , carbon quantum dots / titanium dioxide photocatalytic composite material with more stable physical and chemical properties

Method used

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  • A kind of carbon quantum dot/titanium dioxide composite photocatalytic material and its preparation method and application
  • A kind of carbon quantum dot/titanium dioxide composite photocatalytic material and its preparation method and application
  • A kind of carbon quantum dot/titanium dioxide composite photocatalytic material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Weigh 0.005g of urea and 0.005g of citric acid and dissolve them in 30ml of deionized water, stir for 10min, then weigh 1g of commercial titanium dioxide P25 and add it to the mixture of urea and citric acid, ultrasonically disperse for 40min to obtain a uniformly mixed dispersion. Then the dispersion was transferred to a 50mL polytetrafluoroethylene hydrothermal kettle, and the hydrothermal reaction was carried out at 180°C for 6h. After the hydrothermal kettle was naturally cooled to room temperature, the product was washed three times with ionized water and three times with absolute ethanol in a centrifugal washing manner. The centrifugation speed was 7000rpm, and the centrifugation time was 10min each time. The above product was put into a vacuum oven at 80° C. for 12 hours in vacuum, and the solid was ground to obtain a carbon quantum dot / titanium dioxide composite photocatalytic material (referred to as CQDs / P25, wt.%=0.5%).

[0073] Take 0.12g of the above-mentio...

Embodiment 2

[0075] Weigh 0.01g of urea and 0.01g of citric acid and dissolve them in 30ml of deionized water, stir for 10min, then weigh 1g of commercial titanium dioxide P25 and add it to the mixture of urea and citric acid, and ultrasonically disperse for 40min to obtain a uniformly mixed dispersion. Then the dispersion was transferred to a 50mL polytetrafluoroethylene hydrothermal kettle, and the hydrothermal reaction was carried out at 180°C for 6h. After the hydrothermal kettle was naturally cooled to room temperature, the product was washed three times with centrifugal washing mode ion water and three times with absolute ethanol, the centrifugal speed was 7000rpm, and the centrifugal time was 10min each time. The above product was put into a vacuum oven at 80°C for 12 hours, and the solid was ground to obtain a carbon quantum dot / titanium dioxide composite photocatalytic material (referred to as CQDs / P25, wt.%=1%). figure 2The TEM figure of the carbon quantum dots / titanium dioxide ...

Embodiment 3

[0078] Weigh 0.05g of urea and 0.05g of citric acid and dissolve in 30ml of deionized water, stir for 10min, then weigh 1g of commercial titanium dioxide P25 and add it to the mixture of urea and citric acid, ultrasonically disperse for 40min to obtain a uniformly mixed dispersion. Then the dispersion was transferred to a 50mL polytetrafluoroethylene hydrothermal kettle, and the hydrothermal reaction was carried out at 180°C for 6h. After the hydrothermal kettle was naturally cooled to room temperature, the product was washed three times with centrifugal washing mode ion water and three times with absolute ethanol, the centrifugal speed was 7000rpm, and the centrifugal time was 10min each time. The above product was put into a vacuum oven at 80°C for 12 hours, and the solid was ground to obtain a carbon quantum dot / titanium dioxide composite photocatalytic material (referred to as CQDs / P25, wt.%=5%).

[0079] Take 0.12g of the above-mentioned carbon quantum dot / titanium dioxid...

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Abstract

The invention relates to a carbon quantum dot / titanium dioxide composite photocatalytic material and a preparation method and application thereof. The carbon quantum dot / titanium dioxide composite photocatalytic material includes titanium dioxide and carbon quantum dots growing in situ on the surface of the titanium dioxide. The mass ratio of the carbon quantum dots to the titanium dioxide is (0.005-0.5):1 or preferably (0.005-0.2):1. Compared with existing carbon quantum dot / titanium dioxide composite photocatalytic materials, the carbon quantum dots and the titanium dioxide in the carbon quantum dot / titanium dioxide composite photocatalytic material with the carbon quantum dots growing in situ are bonded by Ti-O-C bonds, the carbon quantum dots are not easily detached from the surface ofthe titanium dioxide, and a carbon quantum dot / titanium dioxide two-phase heterogeneous structure with more stable structural and chemical properties is formed.

Description

technical field [0001] The invention relates to a carbon quantum dot / titanium dioxide composite photocatalytic material, a preparation method thereof and an application in degrading indoor gas phase pollutants, belonging to the technical field of environmental photocatalysis. Background technique [0002] According to investigations and studies, most people in modern society spend more than 80% of their time indoors in a day, including factories, offices, and living rooms. Therefore, the air quality of indoor environments is closely related to human health. However, a large number of landscaping, decoration materials, and the use of electrical equipment indoors have caused a large amount of chemical substances (mainly volatile organic compounds such as formaldehyde and benzene series) to be produced indoors. Some toxic and harmful chemical substances have direct or potential effects on the human body. hazards. Affected by indoor air pollution, the incidence of some respirat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J20/20B01J20/30B01D53/86B01D53/72
CPCB01D53/8668B01D2258/06B01J20/20B01J21/063B01J35/004Y02A50/20
Inventor 孙静胡译丹谢晓峰王焱王晓陆冠宏林文娇曾庆龙
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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