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-C3N

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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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[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 preparation method of the dense heterojunction structure includes the following steps:

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

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

[0032](2) Preparation of tungsten trioxide nanorods: Weigh a certain amount of ammonium...

Example Embodiment

[0039]Example 1

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

[0041]Weigh 3.5g of ammonium metatungstate and dissolve it in 50mL of deionized water after grinding. After ultrasonic dispersion, add a certain amount of acid to adjust the pH of the solution to 2, then transfer it to a hydrothermal kettle to react at 180°C for 24h. 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 carbon nitride quantum dots into 100mL deionized water, add 1g tungsten trioxide nanorods, stir for 30min, ultrasonically disperse, put in a hydrothermal kettle for reaction at 120℃ for 2h, cool, and freeze-dry the sample at 50℃ After vacuum dryin...

Example Embodiment

[0044]Example 2

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

[0046]Weigh 3.5g of ammonium metatungstate and dissolve it in 50mL of deionized water after grinding. After ultrasonic dispersion, add a certain amount of acid to adjust the pH of the solution to 2, then transfer it to a hydrothermal kettle to react at 180°C for 24h. 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 carbon nitride quantum dots into 100mL deionized water, add 1g tungsten trioxide nanorods, stir for 30min, ultrasonically disperse, put in a hydrothermal kettle for reaction at 120℃ for 2h, cool, and freeze-dry the sample at 50℃ After vacuum dryin...

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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 ...

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/22C02F101/38
CPCB01J27/24B01J35/004C02F1/30C02F2305/10C02F2101/38C02F2101/22C02F2101/40B01J27/20B01J23/30B01J37/009B01J35/0033B01J37/033B01J35/0013B01J37/343B01J37/0236B01J37/0036B01J37/0238B01J35/002
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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