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Covalent organic framework material as well as preparation method and application thereof

A technology of covalent organic framework and connection method, applied in the field of air purification, can solve the problems of inability to remove ozone efficiently, poor crystallinity, etc., and achieve the effect of avoiding secondary pollution and high specific surface area

Pending Publication Date: 2020-06-30
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to use a class of covalent organic framework materials as ozone removal agents to solve the challenges of existing materials with poor crystallinity and inability to efficiently remove ozone

Method used

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  • Covalent organic framework material as well as preparation method and application thereof
  • Covalent organic framework material as well as preparation method and application thereof
  • Covalent organic framework material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Synthesis of Py-An-COF: the specific method is as follows:

[0047] Weigh 11.3mg of amino-containing monomer 1,3,6,8-tetrakis-(4-aminophenyl)pyrene, add it to a 5ml glass tube, and then weigh 9.36mg of aldehyde-containing monomer 9,10-Anthracene dialdehyde was also added to the glass tube. Add 0.5mL of mesitylene and 0.5mL of 1,4-dioxane solvent to it with a pipette gun, after ultrasonic vibration for 10 minutes, then add 0.1mL of 6M glacial acetic acid solution, continue ultrasonication for 10 minutes, and then After 3 times of using liquid nitrogen to evacuate and circulate, the air therein was pumped out and the tube was sealed. Then it was placed in an oven at 120°C for 7 days. After the reaction, the temperature was lowered, and then extracted with tetrahydrofuran for two days, and then dried in a vacuum oven to obtain the Py-An-COF material. The structure and powder diffraction of Py-An-COF as figure 1 , figure 2 shown.

Embodiment 2

[0049] The specific method for Py-An-COF to remove different concentrations of ozone is as follows:

[0050] Weigh 80 mg of the synthesized Py-An-COF and place it in a hollow glass tube with an inner diameter of 6-8 mm. image 3 In the shown device flow, in which KI solution is used to remove excess ozone, different concentrations of ozone are adjusted by controlling the ratio of mixed gas. Keep the ozone outlet flow rate at 500mL per minute, control the concentration of ozone by adjusting the flow valve, and the relative humidity of the gas is 40%. Turn on the switch of the ozone generator, and the tested ozone concentrations are 0.1ppm, 1ppm, 5ppm, and 1000ppm respectively. Use an ozone detector to test the residual ozone after COF treatment to calculate the ozone removal ability.

[0051]Perform a performance test on the process of Example 2 according to the above method, and the results are shown in Table 1 below:

[0052] Table 1. Test results for different concentrati...

Embodiment 3

[0056] Py-An-COF removes ozone at different humidity, the specific method is as follows:

[0057] Weigh 80 mg of Py-An-COF and put them into 5 hollow glass tubes with an inner diameter of 6-8 mm. Figure 4 In the setup shown, the relative humidity of the ozone stream is controlled by controlling the flow valve to adjust the rate of bubbling in the water bottle. The intake air of the ozone generator is dry air, and its water content is kept at 0. Wherein the concentration of ozone is maintained at a high concentration of 1000ppm. The ability of Py-An-COF to remove ozone was tested at relative humidity of 0, 15%, 30%, 60%, and 95%. Then test the powder diffraction pattern of Py-An-COF after the reaction, such as Figure 5 As shown, it is found that the diffraction peak disappears, indicating that the bond between ozone and imine is broken after the reaction, resulting in the decrease of the crystallinity of COF.

[0058] Perform a performance test on the process of Example 3...

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Abstract

The invention relates to preparation and application of a covalent organic framework material. The covalent organic framework material contains a repetitive structural unit with an imine bond, a carbon-carbon double bond or an enol structure, and has the characteristics of high specific surface area, ordered pore structure and the like. The covalent organic framework material can be used as an ozone remover to be filled in various air purification devices to remove ozone in air. According to the covalent organic framework material, the purpose of removing ozone is achieved by taking a precisely introduced repetitive structure unit as an ozone consumption site. The covalent organic framework material has the characteristics of high removal efficiency, obvious ozone removal phenomenon and the like, is not influenced by air humidity, and can effectively remove ozone in various humidity ranges.

Description

technical field [0001] The invention relates to the field of air purification, in particular to a class of covalent organic framework materials used as an ozone remover to efficiently remove ozone in the air. Background technique [0002] In the past two decades, with the rapid industrialization and urbanization of the world, the problem of air pollution has become more and more serious, especially the excessive ozone concentration has been recognized as a serious public health problem worldwide. According to the World Health Organization (WHO) index, the ozone concentration should not exceed 0.1mg / m within 8 hours 3 , long-term exposure to ozone has been associated with adverse effects of acute respiratory infection and cardiovascular disease in humans. However, at the end of spring, especially in summer, the concentration of ozone often exceeds the target at a very fast speed, which undoubtedly has a great impact on human health. In recent years, in confined spaces such ...

Claims

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Application Information

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IPC IPC(8): C08G83/00B01D53/66B01D53/81
CPCC08G83/008B01D53/66B01D53/81Y02A50/20
Inventor 张振杰闫东陈瑶张赛男
Owner NANKAI UNIV
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