Uranyl ion imprinted polymer and preparation method and application thereof

A technology of imprinting polymers and uranyl ions, which is applied in the preparation of organic compounds, carboxylate esters, chemical instruments and methods, etc. It can solve the problems of low adsorption capacity, low uranium recovery rate, and adsorption capacity uranium recovery rate, etc. problem, to achieve the effect of high adsorption capacity

Inactive Publication Date: 2013-06-26
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The optimal pH range of ion-imprinted polymers prepared by using piroxicam (Pir), succinic acid (SA), DCQ, HEMA and 4-VP as functional monomers is close to that of seawater, but their adsorption capacity is not high, And the recovery rate of uranium in seawater is low, and uranium cannot be extracted from seawater well (Metilda, P.; Gladis, J.M.; Venkateswaran, G.; Rao, T.P. Anal Chim Acta2007, 587, 263)
Therefore, the current ion imprinted polymers can adsorb a small amount of uranium from seawater, but in order to realize the industrial application of seawater uranium extraction, it is necessary to solve the problems of the adsorption capacity of ion imprinted polymers and the recovery rate of uranium in seawater, and find a suitable The functional monomer makes its optimum pH within the pH range of seawater to achieve the best adsorption effect

Method used

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  • Uranyl ion imprinted polymer and preparation method and application thereof
  • Uranyl ion imprinted polymer and preparation method and application thereof
  • Uranyl ion imprinted polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1, the synthesis of uranyl ion imprinted polymer

[0052] 1. Synthesis and characterization of methacrylic acid (1,3-diphenyl-1,3-dicarbonyl)-2-propyl ester functional monomer shown in formula I-1

[0053] (Formula I-1)

[0054] Dibenzoylmethane (4.48g, 20mmol) and N-bromosuccinimide (NBS, 3.56g, 20mmol) were stirred and reacted in 30mL of dichloromethane, and then recrystallized from petroleum ether to obtain bromodibenzoyl methane. Methacrylic acid and triethylamine were reacted in acetone for 3h (wherein the molar ratio of feeding was n(bromodibenzoylmethane):n(triethylamine):n(methacrylic acid)=1:1.2:1.2), The formed methacrylate reacts with bromodibenzoylmethane for esterification, and the crude product is purified by recrystallization of ether-petroleum ether (v / v=5:3) to obtain methacrylic acid (1,3-diphenyl - Pure product of 1,3-dicarbonyl)-2-propyl ester functional monomer. chemical reaction flow chart figure 1 shown.

[0055] The structure i...

Embodiment 2

[0063] Example 2, the uranyl ion-imprinted polymer UO prepared in Example 1 2 2+ - Adsorption properties of IIP

[0064] 1. Preparation of ammonium uranyl carbonate mother liquor

[0065] 100mL of 6mM ammonium carbonate solution was added dropwise to 100mL of 2mM uranyl nitrate solution while stirring, and the solution gradually turned yellow. After the dropwise addition, 44 mL of 0.1 M ammonium carbonate solution was added, and the stirring was continued to obtain the ammonium uranyl carbonate mother liquor. This mother liquor contains excessive ammonium carbonate, and its pH is 9; it is diluted with water, and its pH value remains basically unchanged. The concentration of uranium in the ammonium uranyl carbonate mother liquor was measured by ICP to be 200ppm.

[0066] 2. Adsorption properties of imprinted polymers

[0067] Uranyl ion imprinted polymer (UO 2 2+ -IIP) The main experimental process of uranium adsorption is as follows: Weigh 10 mg of uranyl ion-imprinted ...

Embodiment 3

[0117] Example 3. Synthesis and adsorption properties of uranyl ion-imprinted polymers

[0118] 1. Synthesis and characterization of (2,4-dicarbonyl)-3-pentyl ester functional monomer of methacrylic acid shown in formula I-2

[0119]

[0120] Acetylacetone (2.00g, 20mmol) reacted with N-bromosuccinimide (NBS, 3.56g, 20mmol) with stirring in 30mL of dichloromethane to synthesize 3-bromo-2,4-pentanedione. Esterification of methacrylic acid radicals formed with triethylamine and methacrylic acid for 3 hours with stirring at room temperature (wherein the molar ratio of feed is n(3-bromo-2,4-pentanedione):n(triethylamine):n (Methacrylic acid)=1:1.2:1.2), after the reaction is finished, the by-product triethylamine salt is removed by filtration, and the obtained crude product is separated and purified by column chromatography to obtain (2,4-dicarbonyl)-3-pentane ester monomer.

[0121] The structure is confirmed as follows:

[0122] The result of NMR analysis is: δ H (300MHZ,...

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Abstract

The invention discloses a uranyl ion imprinted polymer and a preparation method and application thereof. The uranyl ion imprinted polymer is prepared by the steps of with a uranyl ion as a template and beta-diketone modified with acryloyl group or methacryloyl as a functional monomer, carrying out polymerization reaction under the actions of an initiator and a cross-linking agent, and removing the template uranyl ion from the obtained polymer after the reaction is ended. The imprinted polymer can compete to absorb uranyl ions from uranyl ammonium carbonate containing a lot of free carbonates, is high in adsorption capacity, and is not interfered by metal ions such as Li<+>, Na<+>, K<+> and Rb<+>. Therefore, the imprinted polymer can be used for adsorbing and extracting uranium form sea water with complicated ingredients and low uranium concentration.

Description

technical field [0001] The invention relates to a uranyl ion imprinted polymer, a preparation method and application thereof. Background technique [0002] Uranium is currently the most important nuclear fuel in nuclear energy utilization, and its mining, extraction, and separation are of great significance to the further sustainable development of nuclear energy. The average concentration of uranium in seawater is 3.3μg / L, and there are about 1.386×10 14 tons of seawater, the uranium resources in seawater are more than 4 billion tons (uranium is expressed as UO 2 (CO 3 ) 3 4- form), which is more than 800 times the proven reserves on land. Efficient and cheap extraction of uranium from seawater is of great significance to the sustainable development of nuclear energy. The ion imprinted polymer (Ionic Imprinted Polymer, IIP) has two obvious characteristics for the enrichment and separation of metal ions: one is that the action site in IIP has a strong binding ability t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/11C07D333/22C08F220/30C08F220/28C08F220/38C08J9/26C08J9/28B01J20/26B01J20/30C02F1/28C22B7/00C22B60/02
CPCY02P10/20
Inventor 沈兴海张红娟陈庆德梁和乐
Owner PEKING UNIV
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