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Preparation and application of CNQDs (Carbon nitride quantum dots)-modified TiO2 photonic crystal catalyst

A quantum dot and carbon nitride technology, applied in physical/chemical process catalysts, air quality improvement, inorganic chemistry, etc., can solve the problems of inability to completely remove organic molecules, low utilization efficiency of sunlight, and low specific surface area of ​​materials , to achieve the effect of promoting photocatalytic performance, enhancing the ability of photocatalytic degradation of organic pollutants, and large specific surface area

Inactive Publication Date: 2019-03-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary TiO is currently widely studied 2 The utilization efficiency of the material to sunlight is not high and the specific surface area of ​​the material is low, making its catalytic activity low, and the complete removal of organic molecules cannot be achieved, which greatly limits its practical application.

Method used

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  • Preparation and application of CNQDs (Carbon nitride quantum dots)-modified TiO2 photonic crystal catalyst
  • Preparation and application of CNQDs (Carbon nitride quantum dots)-modified TiO2 photonic crystal catalyst
  • Preparation and application of CNQDs (Carbon nitride quantum dots)-modified TiO2 photonic crystal catalyst

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preparation example Construction

[0036] Preparation of polystyrene pellet template

[0037] Polystyrene pellets were prepared by emulsion polymerization. In a three-necked flask, sodium lauryl sulfate (0.45g), potassium persulfate (0.6g) were dissolved in a mixed solution of 132mL ethanol and 288mL water under a constant temperature of 25°C under magnetic stirring to form a colorless and transparent solution, N 2 Protect, heat the oil bath to 71°C, immediately add 36mL styrene with a syringe, cool to room temperature after refluxing for 19h, filter out large solidified substances with absorbent cotton, and obtain a milky white polystyrene emulsion. The emulsion was dried at 70° C. to obtain regularly arranged polystyrene sphere templates (with a particle size of 265 nm).

Embodiment

[0039] Carbon Nitride Quantum Dots Modified Inverse Opal TiO 2 Photocatalyst (TCN IO)

[0040] Preparation of CNQDs aqueous solution

[0041] Grind and mix 0.081g of sodium citrate and 0.101g of urea evenly and transfer them to the lining of a polytetrafluoroethylene reactor. Screw the stainless steel jacket tightly and seal it well, and keep it in an electric heating constant temperature blast drying oven at 180°C for 2h. After taking out the autoclave, let it cool naturally at room temperature, and ultrasonically wash the obtained brown solid three times with absolute ethanol, put it into a dialysis bag of MWCO3500 specification, and dialyze it in 20mL deionized water at room temperature for 24 hours to obtain light yellow carbon nitride quantum dots aqueous solution.

[0042] Add 1 mL of acetylacetone to 25 mL of ethanol and stir to dissolve, then add 5.6 mL of isopropyl titanate, stir for 2 minutes, then add 0.85 mL of concentrated hydrochloric acid and 4.6 mL of carbon...

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Abstract

The invention provides a preparation method for a CNQDs (Carbon nitride quantum dots)-doped TiO2 photonic crystal for photocatalytic degradation of VOCs (Volatile organic compounds) and dyes. According to the method, an anti-protein structure photocatalyst which is controllable in pore sizes and in ordered arrangement is formed by the methods of performing perfusion, hydrolysis and high-temperature calcining treatment after adding a solution of the CNQDs prepared by a dialysis method into a precursor solution by taking polystyrene spheres as a template and taking titanium isopropoxide as a titanium source precursor. On one hand, the structure makes the material have a large specific surface area, which is beneficial to the adsorption of the VOCs and dye molecules to the surfaces of the catalyst; on the other hand, the utilization rate of the material to sunlight is improved by the slow light effect and the multiple light scattering effects of an inverse opal structure; and the materialhas good photocatalytic degradation activity, stability and renewability, and provides a practical and feasible solution for indoor air pollution and water body organic pollution.

Description

technical field [0001] The invention relates to the fields of environmental science and engineering, nanometer materials and photocatalysis. Background technique [0002] It is reported that people spend 90% of their time indoors, so indoor air quality (IAQ) has a significant impact on human health. According to the Environmental Protection Agency (EPA), indoor air pollution is considered one of the top five environmental risks to public health. Flooring and adhesives for interior decoration are important sources of volatile organic compounds (VOCs). As people's requirements for a clean and safe indoor environment are getting higher and higher, many technologies for removing VOCs in indoor air have been developed, such as adsorption method, ozone method, non-thermal plasma method, etc. However, these treatment methods have disadvantages such as high cost and pollution transfer. Semiconductor photocatalytic oxidation technology has become an effective new method to solve t...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C01B3/04B01D53/86B01D53/44B01D53/72C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01D53/007B01D53/864B01D53/8668B01D53/8687C01B3/042C02F1/30B01J27/24C01B2203/1041C01B2203/0277C02F2101/34C02F2101/308C02F2101/38C02F2101/36C02F2305/10B01D2257/704B01D2257/708B01D2257/7027B01D2259/802B01J35/613B01J35/39B01J35/633Y02A50/20Y02E60/36
Inventor 刘勇弟雷菊英俞洁张金龙王灵芝张飞宇蒋杰伦孙鲁颖杨帆
Owner EAST CHINA UNIV OF SCI & TECH
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