Covalent organic framework (COF) nanotube, and preparation method and application thereof

A technology of covalent organic frameworks and nanotubes, applied in the field of nanomaterials, can solve the problems of inability to obtain continuous and uniform COFs films, difficulty in polycrystalline powders, and insufficient stability of film formation, and achieve easy industrial scale-up production, good adsorption performance, Operational Security Effects

Active Publication Date: 2020-05-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the COFs materials synthesized by conventional methods in the laboratory are all polycrystalline powders, and it is impossible to obtain continuous and uniform COFs films. Because the polycrystalline powders of COFs materials are difficult to dissolve and disperse, COFs materials are synthesized by conventional methods such as suspension coating and solvent evaporation. Insufficient membrane stability 15

Method used

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  • Covalent organic framework (COF) nanotube, and preparation method and application thereof
  • Covalent organic framework (COF) nanotube, and preparation method and application thereof
  • Covalent organic framework (COF) nanotube, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Mix APTES-modified silica nanowires, trialdehyde phloroglucinol, glacial acetic acid, and dioxane at a ratio of 1:1:10:1000, and seal the tube at 130°C under an inert atmosphere 1 hour, and washed once each with tetrahydrofuran and dioxane. Then the material is dispersed in dioxane, trialdehyde group phloroglucinol modified silica nanowires and trialdehyde group phloroglucinol, 3,3'-dimethyl benzidine, glacial acetic acid, two Oxyhexane was mixed at a ratio of 1:1:1.5:5:1000, and the reaction was sealed under an inert atmosphere at 130°C for 72 hours, and washed once with acetone and methanol. The obtained COF tubes were dispersed in acetone, and a 0.001 g / mL solution was prepared, and a filter funnel with a sand core with a diameter of 0.5 cm was used for suction filtration to prepare a COF tube self-assembled membrane.

Embodiment 2

[0053] Example 2: Mix APTES-modified silica nanowires, trialdehyde phloroglucinol, glacial acetic acid, and dioxane at a ratio of 1:1:10:1000, and seal the tube at 130°C under an inert atmosphere 1 hour, and washed once each with tetrahydrofuran and dioxane. Then the material is dispersed in dioxane, trialdehyde group phloroglucinol modified silica nanowires and trialdehyde group phloroglucinol, 3,3'-dimethyl benzidine, glacial acetic acid, two Oxyhexane was mixed at a ratio of 1:1:1.5:5:1000, and the reaction was sealed under an inert atmosphere at 130°C for 72 hours, and washed once with acetone and methanol. After soaking in 5M HF for 5 min, the silica substrate was removed to form a hollow COF tube. The obtained COF tubes were dispersed in acetone, and a 0.001 g / mL solution was prepared, and the COF nanotube self-assembled membrane was prepared by suction filtration using a sand core suction filter funnel with a diameter of 0.5 cm.

Embodiment 3

[0054] Example 3: Mix APTES-modified silica nanowires, trimesaldehyde, glacial acetic acid, and dioxane at a ratio of 1:1:10:1000, and seal the tube at 130°C for 1 hour under an inert atmosphere. Wash once more with tetrahydrofuran and once with dioxane. Then the material is dispersed in dioxane, trimylene triglyceraldehyde modified silica nanowires and trimylene triglyceraldehyde, 3,3'-dimethylbenzidine, glacial acetic acid, dioxane with 1: Mix at a ratio of 1:1.5:5:1000, seal the tube at 130°C for 72 hours under an inert atmosphere, and wash once with acetone and methanol. After soaking in 5M HF for 5 minutes, the silica substrate can be removed to form a hollow COF tube. The obtained COF tubes were dispersed in acetone, and a 0.001 g / mL solution was prepared, and the COF nanotube self-assembled membrane was prepared by suction filtration using a sand core suction filter funnel with a diameter of 0.5 cm.

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Abstract

The invention belongs to the technical field of nanometer materials, and particularly relates to a COF nanotube, and a preparation method and application thereof. According to the method, silicon dioxide nanowires are used as a hard template, and the silicon dioxide nanowires can be deposited on the surfaces of stainless steel wires and other materials through soaking and extraction methods to form a silicon dioxide nanowire film; and with the dispersed silicon oxide nanowires or the film with the deposited silicon dioxide nanowires as a substrate, a layer of COF film grows in situ, and the silicon oxide nanowire template is etched to respectively obtain the dispersed COF nanotube and a stainless steel wire modified by a COF nanotube film. Due to rich micropores of the COF, the COF nanotube has a very high specific surface area, and a hollow pipeline structure provides a rapid substance transmission channel for molecules, so the COF nanotube is an ideal separation and enrichment material and can be used for effectively enriching trace organic pollutants in a solution. The stainless steel wire modified by the COF nanotube film can be used as a stainless steel wire solid-phase micro-extraction head and is used as a pretreatment material for quantitative enrichment and purification of harmful substances.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a covalent organic framework (COF) nanotube and its preparation method and application. Background technique [0002] Covalent organic frameworks (COFs) are organic porous materials connected by covalent bonds with a periodic network structure and a uniform pore structure. Synthesized by thermodynamically controlled reversible reactions, which can precisely control the structural properties of materials such as geometric structure, pore size, and stereo orientation 1 , COFs have diverse structures 2 , low density 3 , high specific surface area 4 and excellent thermal and chemical stability 5 and permanent porosity 6 , can adapt to various biochemical environments such as water or organic solvents. At present, COFs have attracted widespread attention due to their superior performance, and have been applied in separation 7 , enrichment 8 ,catalytic 9 , en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08J5/18C08G83/00B01J20/22B01J20/30C08L87/00
CPCC08J9/26C08J5/18C08G83/008B01J20/226B01J20/103B01J2220/4806B01J2220/4812C08J2387/00C08J2201/044
Inventor 王亚军周方舟方园园
Owner FUDAN UNIV
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