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Meso-porous silica particle supported amidoxime polymer uranium-absorbing material and preparation method thereof

A technology of mesoporous silica gel and adsorption material, which is applied in the preparation of uranium compounds, uranium compounds, alkali metal compounds, etc. The effect of large-scale production and broad application prospects

Active Publication Date: 2019-07-02
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the post-grafting method is used for synthesis, the density of the organic groups on the graft is low and the distribution is uneven, which affects the performance of the material; although the co-condensation method can alleviate the problems of the post-grafting method to a certain extent, when grafting When the organic group content of the branch is too much, the structure of the material is easily destroyed, which is not conducive to its later use.
At the same time, the above methods all have defects such as difficulty in stably controlling the grafting rate, high cost, and difficulty in large-scale production.

Method used

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  • Meso-porous silica particle supported amidoxime polymer uranium-absorbing material and preparation method thereof
  • Meso-porous silica particle supported amidoxime polymer uranium-absorbing material and preparation method thereof
  • Meso-porous silica particle supported amidoxime polymer uranium-absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step 1: Weigh 100g of polyacrylonitrile powder and 26g of lithium chloride particles into a 1L beaker, then add 600mL of N,N-dimethylformamide into it and stir until completely dissolved. Take 52g of the above-mentioned polyacrylonitrile solution and add it into 30g of 50 mesh mesoporous silica gel particles, stir evenly, and degas under reduced pressure. The above defoamed mixture was poured into a three-necked flask equipped with a stirrer and 500 mL of water, and stirred at 3000 rpm for 2 h. Afterwards, the solid was filtered out and dried in an oven for 24 hours to obtain mesoporous silica particles coated with polyacrylonitrile.

[0030] Step 2: Add 500mL of methanol-water with a volume ratio of 1:1 to a 1L Erlenmeyer flask containing 10g of hydroxylamine hydrochloride and 8g of sodium carbonate, and stir at room temperature until completely dissolved. Put 50 g of the mesoporous silica gel particles coated with polyacrylonitrile prepared in the first step into the...

Embodiment 2

[0033] Step 1: Weigh 100g of polyacrylonitrile powder and 26g of polyvinylpyrrolidone into a 1L beaker, then add 600mL of dimethyl sulfoxide into it and stir until completely dissolved. Take 52g of the above-mentioned polyacrylonitrile solution and add it into 30g of 50 mesh mesoporous silica gel particles, stir evenly, and degas under reduced pressure. The above defoamed mixture was poured into a three-necked flask equipped with a stirrer and 500 mL of water, and stirred at 3000 rpm for 2 h. Afterwards, the solid was filtered out and dried in an oven for 24 hours to prepare mesoporous silica particles coated with polyacrylonitrile.

[0034] Step 2: Add 500mL of methanol-water with a volume ratio of 1:1 to a 1L Erlenmeyer flask containing 10g of hydroxylamine hydrochloride and 8g of sodium carbonate, and stir at room temperature until completely dissolved. 55 g of mesoporous silica gel particles coated with polyacrylonitrile prepared in the first step were put into the above-...

Embodiment 3

[0037] Step 1: Weigh 75g of polyacrylonitrile powder and 30g of ammonium chloride into a 1L beaker, then add 450mL of dimethyl sulfoxide into it and stir until completely dissolved. Take 40 g of the above polyacrylonitrile solution and add it into 30 g of 50 mesh mesoporous silica gel particles, stir evenly, and degas under reduced pressure. The above defoamed mixture was poured into a three-necked flask equipped with a stirrer and 500 mL of water, and stirred at 3000 rpm for 2 h. Afterwards, the solid was filtered out and dried in an oven for 24 hours to obtain mesoporous silica particles coated with polyacrylonitrile.

[0038] Step 2: Add 500mL of methanol-water with a volume ratio of 1:1 to a 1L Erlenmeyer flask containing 10g of hydroxylamine hydrochloride and 8g of sodium carbonate, and stir at room temperature until completely dissolved. Put 50 g of the mesoporous silica gel particles coated with polyacrylonitrile prepared in the first step into the above-mentioned Erle...

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Abstract

The invention provides a meso-porous silica particle supported amidoxime polymer uranium-absorbing material and a preparation method thereof. The method comprises the following steps: 1, dissolving polyacrylonitrile and a pore forming agent in a solvent to prepare a polyacrylonitrile solution, coating the surface of meso-porous silica gel particles with the polyacrylonitrile solution by a negativepressure osmosis process, and carrying out phase separation and drying to prepare meso-porous silica particles with polyacrylonitrile supported on the surface; and 2, placing and sealing the meso-porous silica particles prepared in step 1 in a hydroxylamine hydrochloride solution, carrying out an amidoximation reaction, and washing and drying the obtained reaction product after the reaction is completed in order to obtain the meso-porous silica particle supported amidoxime polymer uranium-absorbing material. The meso-porous silica particle supported amidoxime polymer uranium-absorbing material has the advantages of regular porous structure, large specific surface area and good structural stability, and can effectively adsorb uranyl ions in water. The preparation method of the material hasthe advantages of simplicity, low cost, realization of large-scale production, and broad application prospect.

Description

technical field [0001] The invention relates to a uranium adsorption material and a preparation method, in particular to a uranium adsorption material and a preparation method of an amidoxime polymer supported by mesoporous silica gel particles, and belongs to the fields of adsorption materials, water treatment and nuclear chemical industry. Background technique [0002] Uranium is an important nuclear fuel resource, and a large amount of uranium-containing wastewater will inevitably be generated during the entire nuclear fuel cycle and spent fuel reprocessing. If the large-scale uranium-containing nuclear waste liquid is not effectively treated, the radiation and chemical toxicity it brings will pose a huge potential threat to the earth's organisms and the human environment. Whether the uranium in the nuclear waste liquid can be efficiently removed is related to the sustainable development of nuclear energy. [0003] At present, the methods for treating uranium in solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C01G43/00G21F9/12
CPCB01J20/265B01J20/28054B01J20/28045C01G43/003G21F9/12B01J20/28083B01J20/103
Inventor 马福秋刘立佳周伟张春红董红星
Owner HARBIN ENG UNIV
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