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Preparation method and application of covalent organic framework nanowire material

A covalent organic framework, nanowire technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of the reduction of the effective collision rate of the adsorption material and the reduction of the extraction capacity, achieve excellent optical activity, and avoid the limitation of adsorption capacity , the effect of strong photoelectric performance

Active Publication Date: 2021-11-05
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aminoxime group modified on the adsorption material has strong uranium binding ability and certain specific recognition ability, and is considered to be the most promising physical adsorption material, however, extremely low concentrations of uranyl ions compete with other high concentrations The strong electrostatic interaction between active cations will lead to a sharp decline in the extraction capacity, and the final reported adsorption capacity can only reach 700mg g -1
In practical applications, a large number of associated ions not only compete with uranyl ions for adsorption sites, but also are difficult to effectively diffuse into the pores after entering the inner space of the adsorbent, which will lead to a sharp drop in the effective collision rate with the adsorbent.

Method used

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  • Preparation method and application of covalent organic framework nanowire material
  • Preparation method and application of covalent organic framework nanowire material
  • Preparation method and application of covalent organic framework nanowire material

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Experimental program
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Effect test

Embodiment 1

[0030] N 3 Preparation of -COF-Nws-1 covalent organic framework nanowire material

[0031] Inject 1,3,5-trialdehyde phenyltriazine (25mg, 0.065μmol) and 0.45mL dioxane, 0.45mL mesitylene, 0.1mL n-butanol and 0.1mL 6mol / L acetic acid solution into a 10mL pressure-resistant glass tube Obtain a suspension. Then hydrazine hydrate (5 μL, 50-60% solution) was added to the suspension, and then the pressure-resistant glass tube was sealed and heated at 120° C. for 72 hours. Take out the pressure-resistant glass tube, lower the temperature to room temperature, open the pressure-resistant glass tube, collect the precipitate formed, then filter and wash with anhydrous chloroform, anhydrous acetone and anhydrous tetrahydrofuran to obtain a powder sample, and put the powder sample at room temperature and Dry under vacuum to obtain light yellow powder covalent organic framework nanowire material N 3 -COF-Nws-1, its structural formula is as follows:

[0032]

[0033] N 3 -Test steps ...

Embodiment 2

[0039] N 3 Preparation of -COF-Nws-2 covalent organic framework nanowire material

[0040] Inject 1,3,5-trialdehyde phenyltriazine (25mg, 0.065μmol) and 0.4mL dioxane, 0.4mL mesitylene, 0.2mL n-butanol and 0.1mL 6mol / L acetic acid into a 10mL pressure-resistant glass tube The solution obtained a suspension. Then hydrazine hydrate (5 μL, 50-60% solution) was added to the suspension, and then the pressure-resistant glass tube was sealed and heated at 120° C. for 72 hours. Take out the pressure-resistant glass tube, lower the temperature to room temperature, open the pressure-resistant glass tube, collect the formed precipitate, filter it with anhydrous chloroform, anhydrous acetone and anhydrous tetrahydrofuran, and obtain a powder sample after washing. The powder sample was dried under vacuum at room temperature to obtain a light yellow powder covalent organic framework nanowire material N 3 -COF-Nws-2, its structural formula is as follows:

[0041]

[0042] N 3 -Test s...

Embodiment 3

[0044] N 3 - Preparation of COF-Nws-3 covalent organic framework nanowire material

[0045] Inject 1,3,5-trialdehyde phenyltriazine (25mg, 0.065μmol) and 0.3mL dioxane, 0.3mL mesitylene, 0.4mL n-butanol and 0.1mL 6mol / L acetic acid into a 10mL pressure-resistant glass tube The solution obtained a suspension. Then hydrazine hydrate (5 μL, 50-60% solution) was added to the suspension, and then the pressure-resistant glass tube was sealed and heated at 120° C. for 72 hours. Take out the pressure-resistant glass tube, lower the temperature to room temperature, open the pressure-resistant glass tube, collect the formed precipitate, then filter and wash with anhydrous chloroform, anhydrous acetone and anhydrous tetrahydrofuran to obtain a powder sample. The powder sample was dried under vacuum at room temperature to obtain a light yellow powder covalent organic framework nanowire material N 3 -COF-Nws-3, its structural formula is as follows:

[0046]

[0047] N 3 -Test steps...

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Abstract

The invention provides a preparation method and application of a covalent organic framework nanowire material, and relates to the field of functional materials. The preparation method provided by the invention comprises the following steps: reacting hydrazine hydrate with 1, 3, 5-trialdehyde phenyl triazine under the catalysis of a mixed organic solvent and acid to obtain the covalent organic framework nanowire material. The shape control of the nanowire is realized by adjusting the proportion of n-butyl alcohol in the organic solvent. And the morphology size of the nanowire is 50 to 260 nm. The covalent organic framework nanowire material prepared by the invention has high length-width ratio, larger specific surface area and good photoelectric property. The adsorption capacity of the prepared covalent organic framework nanowire material to uranium is up to 1000-1300 mg g<-1> under illumination and in a 10 ppm uranium ion solution. After 5-10 uranium adsorption-desorption cycle experiments, the uranium extraction capacity can reach 75-90% of the first total adsorption capacity.

Description

technical field [0001] The invention relates to the field of functionalized materials, in particular to a preparation method and application of a covalent organic framework nanowire material. Background technique [0002] In order to meet the ever-increasing energy demand, the exploitation of marine uranium resources with a total storage capacity of 4.5 billion tons (about a thousand times that of terrestrial uranium) has attracted widespread attention. Therefore, some materials and adsorption methods for adsorbing uranium have been reported in the current prior art. The aminoxime group modified on the adsorption material has strong uranium binding ability and certain specific recognition ability, and is considered to be the most promising physical adsorption material, however, extremely low concentrations of uranyl ions compete with other high concentrations The strong electrostatic interaction between active cations will lead to a sharp decline in the extraction capacity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30
CPCB01J20/226
Inventor 朱广山元野马旭娇
Owner NORTHEAST NORMAL UNIVERSITY
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