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Preparation method of porous covalent organic framework and application of porous covalent organic framework in uranyl ion capture

A technology of covalent organic framework and uranyl ion, which is applied to the preparation of porous covalent organic framework and the application field of capturing uranyl ions, can solve the problems of poor hydrophilicity, no application yet, poor visible light absorption ability, etc. To achieve the effect of increasing adsorption capacity, promoting adequate exposure, and improving electron transfer and mass transfer efficiency

Active Publication Date: 2021-06-29
NANCHANG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their application in the combination of chemical reduction and photocatalytic reduction mechanisms has not been reported
More importantly, the research of olefin-bonded COFs for photocatalytic reduction of U(VI) is still in its infancy, and most COFs are often hindered by poor hydrophilicity and poor visible light absorption.

Method used

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  • Preparation method of porous covalent organic framework and application of porous covalent organic framework in uranyl ion capture
  • Preparation method of porous covalent organic framework and application of porous covalent organic framework in uranyl ion capture
  • Preparation method of porous covalent organic framework and application of porous covalent organic framework in uranyl ion capture

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Embodiment 1

[0030] Example 1: A preparation method of a porous covalent organic framework

[0031] 12.5mg 2,5-dihydroxy-1,4-benzenedicarbaldehyde (DHBD), 6.2mg 2,4,6-trimethyl-1,3,5-triazine (TMT), 0.45mL mesitylene , 0.45mL 1,4-dioxane, 0.20mL trifluoroacetic acid and 0.025mL acetonitrile were added to a 10mL quartz tube, the quartz tube was quickly frozen in a liquid nitrogen bath, degassed and flame-sealed through three freeze-thaw cycles, The reaction mixture was ultrasonically treated to obtain a homogeneous solution; then, the reaction mixture was placed in an oven at 150°C, and stood for 3 days. After cooling to room temperature, the solid product was collected, washed three times with acetone and methanol, and washed with 0.1 mol / L N 4 Aqueous methanol solution of OH (50wt%) was neutralized to pH 7.0 to remove residual trifluoroacetic acid in the reaction, and then vacuum-dried at 90° C. for 12 hours to obtain olefin-bonded DHBD-TMT in the form of black powder. figure 1 It is a...

Embodiment 2

[0035] The photoelectric properties of DHBD-TMT were studied by UV-Vis absorption spectroscopy and Mott-Schottky spectroscopy. Figure 5 is the UV-Vis absorption spectrum and Mott-Schottky diagram of DHBD-TMT. Depend on Figure 5 a It can be seen that DHBD-TMT can effectively absorb light in the ultraviolet and visible light regions, and DHBD-TMT has a broad light absorption band, which provides the possibility for photocatalytic U(VI) under visible light irradiation. Depend on Figure 5 b It can be seen that the curve in the Mott-Schottky spectrum has a positive slope, indicating that DHBD-TMT is a typical n-type semiconductor, in which photogenerated electrons are the main carriers, and the height of the plane with unsubstituted vinylidene bonds π-conjugated skeletons. According to the x-intercept of the Mott-Schottky spectrum, the DHBD-TMT flat band potential (E fb ) is fitted to be -1.29V vs. NHE (standard hydrogen electrode), which is much more negative than the reduc...

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Abstract

The invention discloses a preparation method of a porous covalent organic framework and application of the porous covalent organic framework in uranyl ion capture, belonging to the technical field of adsorption materials. The preparation method comprises the following step: carrying out an aldol condensation reaction on 2,5-dihydroxy-1,4-phthalaldehyde (DHBD) and 2,4,6-trimethyl-1,3,5-triazine (TMT) to prepare an olefinic bond porous covalent organic framework (DHBD-TMT). The DHBD-TMT prepared by the method disclosed by the invention has a large number of hydroxyl functional groups and a highly planar pi-conjugated structure, and can simultaneously realize multiple functions of selective adsorption, chemical reduction, photocatalytic reduction of uranium and the like, so the adsorption capacity of uranium is remarkably improved. Inductively coupled plasma mass spectrometry results show that DHBD-TMT has excellent adsorption performance on uranyl ions, and has the advantages of high adsorption capacity, good selectivity, excellent optical activity, high stability, good hydrophilicity and the like. Besides, the DHBD-TMT can reduce soluble uranium (VI) into insoluble uranium (IV) through chemical reduction and photocatalytic reduction under visible light irradiation, so uranium fixation is realized; and the DHBD-TMT is an efficient adsorbent for extracting uranyl ions.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to a preparation method of a porous covalent organic framework and its application in capturing uranyl ions. Background technique [0002] Nuclear energy is considered an efficient, clean energy source that provides 13% of the world's electricity. Since uranium is the main source of nuclear fuel for the production of nuclear energy, the mining and recycling of uranium is critical to the development of nuclear energy. There are more than 4.5 billion tons of uranium in seawater, almost 1,000 times that of terrestrial ore, and a potential resource for providing the world with a sustainable supply of nuclear energy. In order to meet the ever-increasing energy demand and the sustainable development of the nuclear industry, efficient extraction of uranium from seawater is an urgent problem to be solved. The reported porous adsorbents for uranium capture mainly i...

Claims

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Application Information

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IPC IPC(8): C08G12/30B01J20/22B01D15/08
CPCC08G12/30B01J20/226B01D15/08
Inventor 邱建丁崔伟荣梁汝萍
Owner NANCHANG UNIV
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