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Carbon nitride quantum dot/tungsten trioxide composite photocatalytic material and preparation method thereof

A technology of composite photocatalysis and tungsten trioxide, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve complex preparation methods, easy aggregation of quantum dots, and problems that have not yet been solved. See the problems of tungsten trioxide composite photocatalytic materials, etc., to achieve the effect of expanding the photoresponse range, improving the separation efficiency, and reducing the probability of recombination

Inactive Publication Date: 2020-12-25
NANTONG VOCATIONAL COLLEGE
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Problems solved by technology

[0005] Chinese patent 201810037542.4 discloses a ZnS micro-composite material decorated with graphene carbonized nitrogen quantum dots and its preparation method and application. It belongs to the technical field of semiconductor composite materials and provides a solution to the problem that g-C3N4 quantum dots are easy to agglomerate and the preparation method is complicated. The problem
[0007] So far, there has been no report on the preparation of carbon nitride quantum dots / tungsten trioxide composite photocatalytic materials by modifying tungsten trioxide with carbon nitride quantum dots

Method used

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  • Carbon nitride quantum dot/tungsten trioxide composite photocatalytic material and preparation method thereof
  • Carbon nitride quantum dot/tungsten trioxide composite photocatalytic material and preparation method thereof
  • Carbon nitride quantum dot/tungsten trioxide composite photocatalytic material and preparation method thereof

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preparation example Construction

[0029] The invention provides a carbon nitride quantum dot / tungsten trioxide composite photocatalytic material and a preparation method thereof. The carbon nitride quantum dot / tungsten trioxide composite photocatalytic material is formed by loading carbon nitride quantum dots on the surface of tungsten trioxide The dense heterojunction structure, its preparation method comprises the following steps:

[0030] (1) Preparation of carbon nitride quantum dots: Weigh a certain molar ratio of sodium citrate and urea, dissolve in deionized water after grinding, ultrasonically disperse, transfer to a hydrothermal kettle for reaction, the reaction temperature is 160-200°C, and the reaction The time is 0.5-4h, then cooled and filtered through a 0.22μm microfiltration membrane, dialyzed for 12-48h, and freeze-dried to obtain carbon nitride quantum dots;

[0031] Wherein, the molar ratio of sodium citrate and urea is 2-8:1.

[0032] (2) Preparation of tungsten trioxide nanorods: Weigh a c...

Embodiment 1

[0040] Weigh 1.01g of sodium citrate and 0.81g of urea, grind for 30 minutes, dissolve in 60mL of deionized water, ultrasonically disperse, transfer to a hydrothermal kettle, react at 180°C for 2h, cool and filter through a 0.22μm microfiltration membrane, and dialyze for 24h , to obtain carbon nitride quantum dots after freeze-drying.

[0041] Weigh 3.5g of ammonium metatungstate, grind it and dissolve it in 50mL of deionized water. After ultrasonic dispersion, add a certain amount of acid to adjust the pH of the solution to 2. Transfer it to a hydrothermal kettle for 24 hours at 180°C. After cooling, wash with water and alcohol Wash each 3 times and dry at 60°C to obtain tungsten trioxide nanorods.

[0042] Weigh 0.05g of carbon nitride quantum dots into 100mL of deionized water, add 1g of tungsten trioxide nanorods, stir for 30min, ultrasonically disperse, place in a hydrothermal kettle for 2h at 120°C, cool, and freeze-dry the sample at 50°C After vacuum drying, the carbo...

Embodiment 2

[0045] Weigh 1.01g of sodium citrate and 0.81g of urea, grind for 30 minutes, dissolve in 60mL of deionized water, ultrasonically disperse, transfer to a hydrothermal kettle, react at 180°C for 2h, cool and filter through a 0.22μm microfiltration membrane, and dialyze for 24h , to obtain carbon nitride quantum dots after freeze-drying.

[0046] Weigh 3.5g of ammonium metatungstate, grind it and dissolve it in 50mL of deionized water. After ultrasonic dispersion, add a certain amount of acid to adjust the pH of the solution to 2. Transfer it to a hydrothermal kettle for 24 hours at 180°C. After cooling, wash with water and alcohol Wash each 3 times and dry at 60°C to obtain tungsten trioxide nanorods.

[0047] Weigh 0.05g of carbon nitride quantum dots into 100mL of deionized water, add 1g of tungsten trioxide nanorods, stir for 30min, ultrasonically disperse, place in a hydrothermal kettle for 2h at 120°C, cool, and freeze-dry the sample at 50°C After vacuum drying, the carbo...

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Abstract

According to the carbon nitride quantum dot / tungsten trioxide composite photocatalytic material and the preparation method thereof, carbon nitride quantum dots and tungsten trioxide are prepared through a hydrothermal method, then the carbon nitride quantum dots are deposited on the surface of tungsten trioxide through hydrothermal deposition, the preparation steps are simple, the cost is low, thecarbon nitride quantum dots and tungsten trioxide form a compact heterojunction structure, directional separation of a charge space is realized, the separation efficiency of tungsten trioxide photo-induced carriers is improved, the recombination probability of hole photo-induced electrons is reduced, meanwhile, the controllability of a tungsten trioxide photo-response interval can be realized, the photo-response interval of the photocatalytic material is expanded, and the photocatalytic activity of the photocatalyst is improved. The prepared photocatalyst has relatively high degradation activity on rhodamine B and methyl orange, and meanwhile, Cr (VI) can be efficiently reduced into Cr (III).

Description

technical field [0001] The invention belongs to the technical field of preparation methods of semiconductor photocatalytic materials, and in particular relates to a carbon nitride quantum dot / tungsten trioxide composite photocatalytic material and a preparation method thereof. Background technique [0002] Photocatalytic technology, as an emerging technology in chemical treatment methods, uses green and inexhaustible solar energy as the energy source for the reaction, does not require external energy, can effectively reduce energy consumption, save resources, and is Degradation of organic matter, photolysis of water to produce hydrogen, reduction of carbon dioxide, and organic reactions have been extensively studied, with broad application prospects and important research value. [0003] As an important transition metal semiconductor material, tungsten trioxide has excellent properties such as high sensitivity, good gas sensitivity and good thermal stability, and has a wide ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/22C02F101/38
CPCB01J27/24C02F1/30C02F2305/10C02F2101/38C02F2101/22C02F2101/40B01J35/39B01J27/20B01J23/30B01J37/009B01J37/033B01J37/343B01J37/0236B01J37/0036B01J37/0238B01J35/30B01J35/23B01J35/33
Inventor 周杰朱蓓蓓吴斌姜敏丁邦琴张海滨周道高建敏高子琪
Owner NANTONG VOCATIONAL COLLEGE
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