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Graphene-TiO2 composite photocatalyst, preparation method thereof, air purification coating and display device

An air purification and graphene technology, applied in the field of air purification, can solve the problems of high photogenerated electron-hole recombination efficiency, reduced specific surface area of ​​nanoparticles, insufficient visible light absorption ability, etc., to improve photocatalytic efficiency, avoid cross-infection, The effect that favors the electron transfer effect

Pending Publication Date: 2021-11-26
NEWLINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 As a kind of nanomaterial, it is easy to agglomerate during the preparation process, and the size of the formed particles is large, thereby reducing the specific surface area of ​​the nanoparticles, which is not conducive to the later application; in addition, it also has high recombination efficiency of photogenerated electron-hole pairs, Shortcomings such as insufficient visible light absorption capacity affect its air purification effect

Method used

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  • Graphene-TiO2 composite photocatalyst, preparation method thereof, air purification coating and display device
  • Graphene-TiO2 composite photocatalyst, preparation method thereof, air purification coating and display device

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preparation example Construction

[0040] Such as figure 1 As shown, the graphene-TiO provided by this application 2 The preparation method of composite photocatalyst comprises the following steps:

[0041] S01: oxidizing and hydroxylating graphene to obtain product A.

[0042] This step can include:

[0043] In a strongly acidic environment, graphene is oxidized with an oxidizing agent to obtain graphene oxide;

[0044] The graphene oxide is hydroxylated with hydrogen peroxide, and the obtained first precipitate is washed and dried to obtain a product A.

[0045] Of course, other raw materials can also be used to oxidize and hydroxylate graphene. Optionally, in the present application, the oxidizing agent may be potassium permanganate, potassium dichromate or potassium persulfate.

[0046] Specifically, this step can be:

[0047] At room temperature, add graphene powder into concentrated sulfuric acid, stir well, add sodium nitrate and potassium permanganate, dilute with deionized water, then add hydroge...

Embodiment 1

[0116] In this embodiment, a display with air purification effect is prepared, and the specific steps are as follows:

[0117] S1. Preparation of graphene-TiO 2 composite photocatalyst

[0118] S11. At room temperature, add 3.0g of graphene powder into 100mL of concentrated sulfuric acid, stir well, add 2.0g of sodium nitrate and stir for 40min, then add 10g of potassium permanganate and continue stirring at 30°C for 1.5h, then cool in an ice bath , then dilute with 600ml deionized water and add a certain amount of H 2 o 2 , until the gas evolution is completely stopped adding H 2 o 2 , and finally, the resulting suspension was filtered, washed with water, and dried at 60° C. for 24 h to obtain product A.

[0119] S12. Add 0.3g of product A and 0.6ml triethanolamine to 150mL N,N-dimethylacetamide, mix well and slowly drop into 60mL N,N-dimethylacetamide (containing 1wt% methyl acryloyl chloride), and stirred at room temperature for 16 hours until the precipitation was co...

Embodiment 2

[0127] In this embodiment, a display with air purification effect is prepared, and the specific steps are as follows:

[0128] S1. Preparation of graphene-TiO 2 composite photocatalyst

[0129] S11. Same as embodiment 1.

[0130] S12. Add 0.2g of product A and 0.6ml triethanolamine to 150mL N,N-dimethylacetamide, mix well and slowly drop into 60mL N,N-dimethylacetamide (containing 1wt% methyl acryloyl chloride), and stirred at room temperature for 16 hours until the precipitation was complete, then dispersed the obtained precipitate in 60mL of N,N-dimethylformamide, and then added 0.25ml of methacrylic acid, 0.5ml of formaldehyde butyl acrylate and 7 mg of azobisisobutyronitrile, and stirred at 65°C for 10 h under the protection of an inert gas. After the reaction was completed and cooled to room temperature, a certain amount of ether was added to precipitate a precipitate. Dry in a vacuum oven at 60°C to obtain the target product B.

[0131] S2 and S3 are the same as embo...

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Abstract

The invention provides a graphene-TiO2 composite photocatalyst, a preparation method thereof, an air purification coating and a display device. The method comprises the following steps: oxidizing and hydroxylating graphene to obtain a product A; carrying out amino modification and vinyl modification on the product A to obtain a product B; and compounding the product B with nitrogen-doped titanium dioxide to obtain the nitrogen-doped titanium dioxide composite material. The graphene-TiO2 composite photocatalyst prepared by the invention can well integrate the advantages of the two materials, so that separation of electron-hole pairs is facilitated, the electron transfer effect is also facilitated, and the photocatalytic efficiency is further improved. Graphene is subjected to oxidation, hydroxylation, amino modification and vinyl modification, and titanium dioxide is subjected to nitrogen doping. The modified graphene can effectively capture harmful substances in air, so that the photocatalytic reaction speed is increased, and the air purification effect is improved. The nitrogen-doped modified titanium dioxide has a large specific surface area, so that the collision probability of the photocatalyst and air is greatly increased, and the purification effect is very good.

Description

technical field [0001] The application belongs to the field of air purification, in particular, relates to a graphene-TiO 2 Composite photocatalyst and its preparation method, air purification coating, and display device. Background technique [0002] Touch screen, also known as "touch screen" or "touch panel", is an inductive glass liquid crystal display device that can receive input signals such as contacts. It is currently the simplest, most convenient and natural way of human-computer interaction. , are widely used in various industries and fields. The use of touch all-in-one machines in indoor public places can be seen everywhere, such as classrooms, conference rooms, stations, banks, hospitals, and functional departments for guidance. These places are all public places with a large flow of people and poor air. In addition, due to interior decoration, the use of high-end furniture is widely popularized, and various building materials, wood-based panels, wall wallpape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C09D7/62C09D5/14G09F9/00
CPCB01J27/24C09D7/62C09D5/14G09F9/00C08K9/02C08K9/04C08K3/042C08K2003/2241B01J35/39
Inventor 彭春燕任娜娜
Owner NEWLINE CO LTD
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