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Preparation method of two-dimensional laminar covalent organic framework membrane

A covalent organic framework and two-dimensional layered technology, which is applied in the field of membrane science, can solve the problems of poor repeatability and low coverage of the film layer, and achieve the effects of improving the quality of film formation, simplifying the film making process, and good application prospects

Active Publication Date: 2017-03-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problems of low film coverage and poor repeatability in methods such as in-situ growth

Method used

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  • Preparation method of two-dimensional laminar covalent organic framework membrane
  • Preparation method of two-dimensional laminar covalent organic framework membrane
  • Preparation method of two-dimensional laminar covalent organic framework membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix 40 mg COF-1 powder at room temperature (according to literature Côté et al., Science , 2005, 310, prepared by the synthetic method in 1166-1170) was dispersed in 40 g of dichloromethane, nitrogen gas was introduced to remove the air in the container, and the above-mentioned substances were mixed uniformly by magnetic stirring after sealing. The above COF-1 dispersion was transferred to an ultrasonic water bath, and the exfoliated COF-1 flakes (such as figure 1 shown). The thickness of the COF-1 flakes is less than 1 nm, indicating that the layered structure of the COF-1 powder has been successfully exfoliated layer by layer. The above solution was deposited on flat glass at room temperature by the drop coating method, and then dried at room temperature for 30 min under a nitrogen atmosphere. After repeating the above process three times, a COF-1 film supported by a glass sheet was obtained (such as figure 2 shown). The surface of COF-1 film is continuous and co...

Embodiment 2

[0033] Mix 2 mg COF-1 powder at room temperature (according to literature Côté et al., Science , 2005, 310, prepared by the synthetic method in 1166-1170) was dispersed in 40 g of dichloromethane, nitrogen gas was introduced to remove the air in the container, and the above-mentioned substances were mixed uniformly by magnetic stirring after sealing. The above COF-1 dispersion was transferred to an ultrasonic water bath, and treated at room temperature for 80 min under the condition of ultrasonic frequency and power of 40 kHz and 40 W, respectively, to obtain exfoliated COF-1 flakes. The above solution was deposited on flat titanium dioxide at room temperature by dipping and pulling method, and then dried at room temperature under nitrogen atmosphere for 30 min. After repeating the above process 6 times, a COF-1 film supported by flat titanium dioxide (such as image 3 shown). COF-1 film has better continuity.

Embodiment 3

[0035] 21 mg ACOF-1 powder (according to literature Li et al. , Chem. Commun. , 2014, 50, prepared by the synthetic method in 13825-13828) was dispersed in 40 g of toluene solvent, nitrogen gas was introduced to remove the air in the container, and the above-mentioned substances were mixed uniformly by magnetic stirring after sealing. The above dispersion of ACOF-1 was transferred to an ultrasonic water bath, treated at room temperature for 30 min under the conditions of ultrasonic frequency and power of 40 kHz and 120 W, respectively, and then peeled off to obtain ACOF-1 flakes (such as Figure 4 shown). The thickness of the ACOF-1 flakes is less than 1 nm, indicating that the ACOF-1 with a layered structure has been successfully exfoliated layer by layer. Finally, the above solution was deposited on the SiO 2 -ZrO 2 Modified porous alumina carrier tube, and then dried at room temperature under nitrogen atmosphere for 100 min, repeating the above process 4 times to obta...

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Abstract

The invention discloses a preparation method of a two-dimensional laminar covalent organic framework membrane. The method comprises the specific steps: (1) mixing a two-dimensional laminar covalent organic framework powder material with an organic solvent, uniformly mixing the mixture after discharging air in a bottle with nitrogen and sealing the bottle, then putting the bottle in an ultrasonic water bath for treatment, and peeling off the covalent organic framework material layer by layer to obtain a dispersion liquid of single atom layer sheets; and (2) depositing the dispersion liquid of the peeled covalent organic framework sheets to the surface of a vector, and after a solvent is fully evaporated, repeating the depositing process many times to obtain a continuous covalent organic framework membrane layer. Compared with an existing membrane forming technology of the covalent organic framework material, the preparation method is simple in process and easy to control, continuous to form membrane and relatively good in repeatability.

Description

technical field [0001] The invention belongs to the field of membrane science and technology, and specifically relates to a preparation method of a two-dimensional layered covalent organic framework membrane. Background technique [0002] Covalent organic framework materials are a kind of porous materials obtained by combining small organic molecules as basic building blocks through covalent bonds. Because this type of material has a regular pore structure similar to inorganic zeolite molecular sieves, excellent thermal stability and chemical stability, it is often called "organic zeolite molecular sieve". Compared with inorganic zeolite molecular sieves, covalent organic framework materials are composed entirely of light elements and thus have lower mass densities. On the other hand, due to the variety and structure of small organic molecule building blocks for the synthesis of covalent organic frameworks, covalent organic framework materials show a very rich diversity of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00
Inventor 李刚武书彬张凯杨赫
Owner SOUTH CHINA UNIV OF TECH
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