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Preparation method of heterocyclic covalent organic polymer and application of heterocyclic covalent organic polymer in uranyl ion adsorption

A covalent organic and uranyl ion technology, applied in ion exchange, selective adsorption, ion exchange regeneration, etc., has achieved good application prospects, simple preparation method, and stable structure

Active Publication Date: 2021-07-09
NANCHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the preparation of heterocyclic covalent organic polymers by Schiff base reaction and its application in the adsorption of uranyl ions

Method used

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  • Preparation method of heterocyclic covalent organic polymer and application of heterocyclic covalent organic polymer in uranyl ion adsorption
  • Preparation method of heterocyclic covalent organic polymer and application of heterocyclic covalent organic polymer in uranyl ion adsorption
  • Preparation method of heterocyclic covalent organic polymer and application of heterocyclic covalent organic polymer in uranyl ion adsorption

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Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Preparation method and property characterization of heterocyclic covalent organic polymer (BdDAB)

[0030]2,4,6-trialdehyde resorcinol (Bd, 0.048g, 0.25mmol), 3,3'-diaminodiphenylamine (DAB, 0.082g, 0.38mmol), 1,4-dioxane (4.0mL) and mesitylene (2.0mL) were put into a 20mL Pyrex glass tube, sonicated for 10 minutes, and then HAc solution (0.5mL, 6M) was added to obtain a reaction mixture solution; After the Pyrex glass tube of the solution was degassed through three freezing pump-thawing cycles, the Pyrex glass tube was flame-sealed and heated in an oven at 120°C for 3 days. After cooling, the brick-red product was separated by filtration and washed with After washing several times with anhydrous tetrahydrofuran (THF), N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), the solid was collected and dried under vacuum at 60°C for 8 hours to obtain imidazole 2,4,6-trialdehyde resorcinol-3,3'-diaminodianiline heterocyclic covalent organic polymer (BdDAB) w...

Embodiment 2

[0035] Embodiment 2: optimization of experimental conditions

[0036] The pH value has an effect on the basic form of uranium element and the extraction capacity of the adsorbent, so the effect of pH (1.0-4.5) on the performance of the adsorbent was studied. Use nitric acid or sodium hydroxide solution to adjust the pH value of the solution within the range of 1.0-4.5, add 4 mg of heterocyclic covalent organic polymer to 20 mL of aqueous solution with a concentration of uranyl ion of 75 mg / L, and use a constant temperature oscillator to shake for 12 After 1 hour, filter with a 0.22 μm microporous membrane, measure the remaining uranyl ion content in the filtrate by inductively coupled plasma mass spectrometry, and calculate the adsorption capacity of heterocyclic covalent organic polymers for uranyl ions. Figure 4 is the effect of pH on adsorption of UO by heterocyclic covalent organic polymer BdDAB 2 2+ Performance Impact Diagram. From Figure 4 It can be seen that the a...

Embodiment 3

[0037] Example 3: Heterocyclic Covalent Organic Polymer BddDAB to UO 2 2+ adsorption and removal

[0038] The effect of the initial concentration of uranium and the adsorption time on the adsorption of UO by the heterocyclic covalent organic polymer BdDAB was studied 2 2+ Impact. Use nitric acid or sodium hydroxide solution to adjust the pH of the solution to 4.5, add 4mg of heterocyclic covalent organic polymer BdDAB to 20mL containing different concentrations of UO 2 2+ (25-280mg / L) aqueous solution, use a constant temperature oscillator to shake for 12 hours, filter with a 0.22μm microporous membrane, and use inductively coupled plasma mass spectrometry to measure the remaining UO in the filtrate 2 2+ content, calculated for heterocyclic covalent organic polymers to UO 2 2+ The adsorption capacity of the heterocyclic covalent organic polymer BdDAB versus UO 2 2+ The adsorption isotherm. Figure 5 is the heterocyclic covalent organic polymer BdDAB on UO 2 2+ The...

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Abstract

The invention discloses a preparation method of a heterocyclic covalent organic polymer and application of the heterocyclic covalent organic polymer in uranyl ion adsorption, belonging to the technical field of environmental protection. The preparation method comprises the following step: subjecting 2,4,6-triformyl resorcinol and 3,3'-diaminodiphenylamine to a Schiff base reaction to prepare the 2,4,6-triformyl resorcinol-3,3'-diaminodiphenylamine heterocyclic covalent organic polymer. The heterocyclic covalent organic polymer takes an imidazole functional group as a connecting unit, and a large number of hydroxyl functional groups are arranged around the imidazole functional group, so the adsorption capacity of uranyl ions can be improved, and the heterocyclic covalent organic polymer has good selectivity on the adsorption of the uranyl ions. The method for preparing the heterocyclic covalent organic polymer is simple, and the heterocyclic covalent organic polymer is stable in structure, friendly to environment, high in adsorption efficiency on uranyl ions in water and good in selectivity and can be used as an efficient adsorbent for uranyl ions.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a heterocyclic covalent organic polymer and its application in uranyl ion adsorption. Background technique [0002] As the primary fuel for the nuclear industry, uranium plays a key role in sustainable energy supply and development. However, the unreasonable discharge of large-scale nuclear power wastewater, traditional land-based uranium mining, unpredictable nuclear accidents, and improper disposal of nuclear wastewater in the process of nuclear waste reprocessing will lead to the release of radioactive uranium into the environment, seriously threatening the ecological environment and human health. Therefore, safe and efficient uranium adsorbents are crucial to environmental protection and social development. However, due to relatively low adsorption capacity and poor selectivity, traditional adsorbent materials (such as ze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/08B01J20/26B01D15/08
CPCC08G12/08B01J20/262B01D15/08
Inventor 邱建丁晏润寒梁汝萍
Owner NANCHANG UNIV
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