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Carbon nitride quantum dot/titanium dioxide sol and preparation method thereof

A technology of titanium dioxide and quantum dots, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of high preparation cost, low quantum yield, poor dispersion, etc., and achieve high quantum yield , strong catalytic activity and easy separation

Inactive Publication Date: 2018-11-09
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, the titanium dioxide sol and carbon nitride composite system is easy to agglomerate and has poor dispersion during the preparation process
Fourth, the quantum yield of the prepared product is low, and the preparation cost is high. It seems that there is no mature report on the preparation method of the carbon nitride quantum dot / titanium dioxide composite material.

Method used

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  • Carbon nitride quantum dot/titanium dioxide sol and preparation method thereof
  • Carbon nitride quantum dot/titanium dioxide sol and preparation method thereof
  • Carbon nitride quantum dot/titanium dioxide sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A kind of preparation method of carbon nitride quantum dot / titanium dioxide

[0027] 1. Preparation of Carbon Nitride Quantum Dots (g-CNQDS)

[0028] 5g of melamine was used as a precursor, calcined to 600°C in a muffle furnace, kept for 3 hours, cooled naturally, taken out, and ground to obtain powdered g-C 3 N 4 . Powdered g-C 3 N 4 Mix evenly with the ammoniacal liquor that volume fraction is 26%, described g-C 3 N 4 The mass-volume ratio of the powder to ammonia water is 1:250, and then placed in a polytetrafluoroethylene reactor at 180°C for hydrothermal reaction for 11 hours. After taking it out, the ammonia water is evaporated by rotary evaporation, and the light white g-C3N4 quantum dot liquid is obtained by ultrasonication. The ultrasonic frequency is 25KHz, and the ultrasonic time is 2 hours.

[0029] 2. Preparation of carbon nitride quantum dots / titanium dioxide sol

[0030]At a low temperature of 0°C, add 1ml of titanium tetrachloride t...

Embodiment 2

[0038] Embodiment 2 A kind of preparation method of carbon nitride quantum dot / titanium dioxide

[0039] 1. Carbon nitride quantum dots (g-CNQD S ) preparation

[0040] 5g of melamine was used as a precursor, calcined to 500°C in a muffle furnace, kept for 1 hour, cooled naturally, taken out, and ground to obtain powdered g-C 3 N 4 . Powdered g-C 3 N 4 Mix evenly with ammonia water with a volume fraction of 25%, the g-C 3 N 4 The mass volume ratio of the powder to ammonia water is 1:200, and then placed in a polytetrafluoroethylene reactor at 170°C for hydrothermal reaction for 10 hours. After taking it out, the ammonia water is evaporated by rotary evaporation, and the light white g-C3N4 quantum dot liquid is obtained by ultrasonication. The ultrasonic frequency is 20KHz, and the ultrasonic time is 1 hour.

[0041] 2. Preparation of carbon nitride quantum dots / titanium dioxide sol

[0042] At a low temperature of 0°C, add 1ml of titanium tetrachloride to a mixed solv...

Embodiment 3

[0044] Embodiment 3: A kind of preparation method of carbon nitride quantum dot / titanium dioxide

[0045] 1. Carbon nitride quantum dots (g-CNQD S ) preparation

[0046] 5g of melamine was used as a precursor, calcined to 700°C in a muffle furnace, kept for 1 hour, cooled naturally, taken out, and ground to obtain powdered g-C 3 N 4 . Powdered g-C 3 N 4 Mix evenly with the ammoniacal liquor that volume fraction is 28%, described g-C 3 N 4 The mass-volume ratio of the powder to ammonia water is 1:300, and then placed in a polytetrafluoroethylene reactor at 190°C for hydrothermal reaction for 12 hours. After taking it out, the ammonia water is evaporated by rotary evaporation, and the light white g-C3N4 quantum dot liquid is obtained by ultrasonication. The ultrasonic frequency is 30KHz, and the ultrasonic time is 3 hours.

[0047] 2. Preparation of carbon nitride quantum dots / titanium dioxide sol

[0048] At a low temperature of 0°C, add 5ml of titanium tetrachloride t...

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Abstract

The invention relates to carbon nitride quantum dot / titanium dioxide sol. The titanium dioxide sol is prepared from titanium dioxide crystal grains, and a diffraction angle 2theta of the titanium dioxide sol has diffraction peaks at 8.78+ / -0.2 degrees, 26.66+ / -0.2 degrees, 38.8+ / -0.2 degrees, 46.75+ / -0.2 degrees, and 58.07+ / -0.2 degrees. A catalytic effect of a titanium dioxide composite materialprepared by the preparation method of the carbon nitride quantum dot / titanium dioxide sol is significantly improved, the degradation rate of 20mg commercial titanium dioxide P25 available in the market at present (brought from Degussa of German) for 100mL methyl orange (18mg / L) in 2 hours is 34.4 percent, and the degradation rate of the 20mg product provided by the invention under the same condition is 87.2 percent and is improved by 2.53 times; and the light current and impedance analysis test shows that the electron-hole is easy to separate, the quantum yield is high, no corrosive reagent isintroduced in the preparation process, the preparation method is environmentally friendly and free from secondary pollution, the product is good in stability and higher in catalytic effect when beingstored for 8 months at the room temperature, the preparation process is simple and feasible, and the industrialized production is easy to implement.

Description

technical field [0001] The invention relates to a carbon nitride / titanium dioxide composite material, in particular to a new carbon nitride quantum dot / titanium dioxide sol material and a preparation method thereof. Background technique [0002] With the continuous growth of population and the rapid development of economy and industry, various environmental problems are becoming more and more serious. Governance of environmental issues is urgent. In recent years, the study of environmental governance has been one of the hot topics in the scientific community. Among them, photocatalytic technology has been applied in many fields, such as environmental pollution control, medical and health, because of its ability to efficiently degrade pollutants, so it has attracted great attention. [0003] Among many photocatalysts, TiO 2 is the most promising photocatalyst. It has the characteristics of non-toxic, stable chemical properties, and no selectivity to the degradation of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2101/308C02F2101/30B01J35/39
Inventor 郭小峰王宏波王丽影李力周平向阳开程航
Owner CHONGQING JIAOTONG UNIVERSITY
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