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Method for preparing functional porous hydrogel based on liquid-gas-liquid drop reactor

A porous hydrogel, functional technology, used in chemical instruments and methods, other chemical processes, alkali metal compounds, etc. Use of active agent, high adsorption capacity, effect of enhancing adsorption capacity

Active Publication Date: 2022-06-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to overcome the problems that the porous structure and mechanical properties cannot be balanced, and the structure is not easy to controllable adjustment when the existing porous hydrogel is prepared, and to provide a liquid-gas-droplet reaction based on the gas-in-water type. Method for preparing amidoxime-based porous hydrogel

Method used

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  • Method for preparing functional porous hydrogel based on liquid-gas-liquid drop reactor
  • Method for preparing functional porous hydrogel based on liquid-gas-liquid drop reactor
  • Method for preparing functional porous hydrogel based on liquid-gas-liquid drop reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) the preparation of polypropylene amidoxime;

[0035] In a flask, put 60 mmol of NH 2 OH·HCl was added to 45 mL of N,N-methyleneformamide at 45°C, heated in a water bath for 30 min, and then 27 mmol Na was added under vigorous stirring. 2 CO 3 and 18mmol NaOH, and then the resulting mixed solution was reacted under mechanical stirring at 1000rpm for 3.0h; then 60mmol of PAN was added, and after complete dissolution, the temperature was raised to 65°C and the reaction was continued for 24h; 13.5mmol of Na was added again 2 CO 3 and 9.0 mmol of NaOH, after continuing to react for 24 hours, the supernatant was collected by centrifugation at 13,000 rpm until no precipitation occurred, the supernatant was dropped into pure water to collect the flocs produced, and freeze-dried to obtain polypropylene Amidoxime products (PAO);

[0036] (2) preparation of methacryloyl gelatin;

[0037] Add 5.0g of Gelatin to 50mL, 2.0M, pH 7.4 phosphate buffer solution, heat up to 50°C ...

Embodiment 2

[0046] (1) the preparation of polypropylene amidoxime;

[0047] In a flask, put 50 mmol of NH 2 OH·HCl was added to 35 mL of N,N-methyleneformamide at 30°C, heated in a water bath for 20 min, and then 20 mmol Na was added under vigorous stirring. 2 CO 3 and 10 mmol NaOH, and then the resulting mixed solution was reacted under mechanical stirring at 800 rpm for 2.0 h; then 50 mmol of PAN was added, and after complete dissolution, the temperature was increased to 60 °C and the reaction was continued for 12 h; 15 mmol of Na was added again. 2 CO 3 and 10mmol of NaOH, after continuing to react for 12h, the supernatant was collected by centrifugation at 10,000rpm until no precipitation was produced, the supernatant was dropped into pure water to collect the flocs produced, and freeze-dried to obtain the polypropylene amine Oxime products (PAO);

[0048] (2) preparation of methacryloyl gelatin;

[0049] Add 4.0 g of Gelatin to 40 mL, 1.0 M, pH 7.0 phosphoric acid buffer solutio...

Embodiment 3

[0054] (1) the preparation of polypropylene amidoxime;

[0055] In a flask, put 70 mmol of NH 2 OH·HCl was added to 55 mL of N,N-methyleneformamide at 55°C, heated in a water bath for 40 min, and then 30 mmol Na was added under vigorous stirring. 2 CO 3 and 25mmol NaOH, and then the resulting mixed solution was reacted under mechanical stirring at 1200rpm for 4.0h; then 70mmol of PAN was added, and after complete dissolution, the temperature was raised to 85°C and the reaction was continued for 36h; 15mmol of Na was added again 2 CO 3 and 15mmol of NaOH, after continuing to react for 36h, the supernatant was collected by centrifugation at 15000rpm until no precipitation was produced, the supernatant was dropped into pure water to collect the flocs produced, and freeze-dried to obtain the polypropylene amine. Oxime products (PAO);

[0056] (2) preparation of methacryloyl gelatin;

[0057] Add 6.0g of Gelatin to 60mL, 3.0M, pH 8.0 phosphate buffer solution, heat up to 60°C ...

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Abstract

The invention belongs to the technical field of adsorption separation functional materials, and discloses a method for preparing functional porous hydrogel based on a liquid-gas-liquid drop reactor. The preparation method comprises the following steps: firstly, preparing functional units of polyamidoxime and methacryloyl gelatin, then adding the polyamidoxime and methacryloyl gelatin into a NaOH solution, adding a photoinitiator 2-hydroxy-2-methyl propiophenone after the polyamidoxime and methacryloyl gelatin are completely dissolved, carrying out uniform vortex dispersion, then carrying out high-speed stirring to prepare a gas-in-water type liquid-gas-liquid drop reactor, and carrying out high-speed stirring to obtain the polyamidoxime / methacryloyl gelatin composite photoinitiator. Carrying out polymerization initiated by ultraviolet light to prepare an amidoxime functional porous hydrogel-based adsorbent GMPAO; the preparation process of the adsorbent is simplified through direct use of the polyamidoxime functional unit, and a large number of binding sites are provided for selective extraction of hexavalent uranium in an aqueous solution; the use of the liquid-gas-liquid drop reactor provides an effective method for the controllable preparation of the porous structure, and the mass transfer kinetics of the adsorbent is accelerated by combining the water absorption of the hydrogel with the porous structure.

Description

technical field [0001] The invention belongs to the technical field of adsorption and separation functional material preparation, in particular to a method for preparing an amidoxime functional porous hydrogel adsorbent in a gas-in-water liquid-gas droplet reactor. Background technique [0002] Nuclear energy is a well-known solution to global energy problems, providing high energy density with low greenhouse gas emissions. Uranium is a key element of nuclear fuel, so uranium mining and recovery is critical to the use of nuclear energy. At present, the proven uranium reserves on land are about 7.6 million tons, and the uranium content in seawater is hundreds of times that, about 4.5 billion tons, which can be used to supply nuclear energy for thousands of years. In addition, the uneven distribution of uranium resources on land makes it difficult to develop. Therefore, developing a technology to extract uranium from seawater will effectively alleviate the problem of energy s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C22B60/02
CPCB01J20/264B01J20/28047C22B60/0265
Inventor 白雪潘建明李浩
Owner JIANGSU UNIV
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