Adsorbent and preparation method and application thereof

An adsorbent and polymer technology, applied in the field of adsorbents and their preparation, can solve the problems of easy hydrolysis and radiolysis of diluents and phase modifiers, large column pressure, and large amount of organic reagents used, and achieve excellent selective adsorption. Ability, simple preparation process, good economic effect

Inactive Publication Date: 2019-01-22
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above solvent extraction process has high extraction capacity and strong selectivity for Cs(I), but it also has the following disadvantages: the extractant, diluent and phase modifier are easy to hydrolyze and radiolyze, resulting in a large amount of secondary waste liquid; multi-step extraction is required , washing and stripping, large-scale equipment; large amount of organic reagents used
However, the carrier SiO 2 -Calix aryl crown ether has limited loading capacity and low capacity to adsorb Cs(I); silicon-based supramolecular recognition materials have poor alkali resistance and radiation resistance; SiO 2 -P particle size is small (40-60μm), and the column pressure is relatively high when the high-level waste liquid flows through the chromatographic column

Method used

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  • Adsorbent and preparation method and application thereof
  • Adsorbent and preparation method and application thereof
  • Adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 5.0 g of MMCs to 4 mL of concentrated nitric acid, react at 120 °C for 4 h, cool to room temperature, wash until neutral, and dry at 80 °C for 4 h.

[0039] 0.212g m / p-formyl styrene, 0.0376g m / p-divinylbenzene, 0.675g sodium methyl benzoate, 0.426g dioctyl phthalate, 0.035g 1,1-dicyclohexyl Amine-1-carbonitrile and 0.035g of azobisisobutyronitrile were dissolved in a mixed solvent of 20ml of 1,2,3-trichloropropane and 20ml of m-xylene, and the mixed solution was transferred to a container equipped with 5.0g of the above pretreated In the rotary evaporator of good MMCs, the room temperature was rotated for 90 minutes, then the temperature was raised to 50 ° C, and the rotary evaporation was continued for 120 minutes, and then the 2 Under protection, the reaction was continued at 90°C for 24h; finally cooled to room temperature, washed with acetone and methanol, filtered with suction, and vacuum-dried at 50°C for 24h after repeated three times to obtain a carbon-poly...

Embodiment 2

[0042] The carbon-based-polymer composite matrix was prepared as described in Example 1. Weighed 2.0 g of MMCs-P-5 and added 80 mL of methanol, oscillated at a constant temperature for 60 min, filtered and dried for later use; 1.0 g of Calix[4]BisTBuC6 and 0.4 Dissolve g lauryl alcohol in 60mL dichloromethane and mix well; then add the above-mentioned activated MMCs-P-5, stir thoroughly at room temperature for 90min, then slowly evaporate the solvent in vacuum at 45°C until the carbon spheres reach a saturated surface-dry state; finally in Dry in vacuum at 55°C for 24h.

Embodiment 3

[0044] The carbon-based-polymer composite matrix was prepared as described in Example 1. Weighed 2.0g of MMCs-P-5 and added 80mL of methanol, oscillated at constant temperature for 60min, filtered and dried for later use; 1.0g of Calix[4]BisTBuC6 was dissolved in 60mL Dichloromethane, mix well; then add the above activated MMCs-P-5, stir thoroughly at room temperature for 90min, then slowly evaporate the solvent in vacuum at 45°C until the carbon spheres reach a saturated surface-dry state; finally vacuum dry at 55°C for 24h.

[0045] figure 1 It is the SEM figure of the carbon-based-polymer composite matrix and the carbon-based supramolecular adsorbent provided by the embodiments of the present invention; wherein (a) is MMCs-P-5, (b) is the section of MMCs-P-5, (c) For Calix[4]BisTBuC6 / MMCs-P, (d) for Calix[4]BisTBuC6 / MMCs-P section, through figure 1 It shows that the overall appearance of MMCs-P is a uniform and regular spherical shape, and there are many large pores in t...

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Abstract

The invention discloses an adsorbent and a preparation method and application thereof. The method comprises the step of loading calixcrown on a carbon base-polymer composite matrix, wherein the carbonbase-polymer composite matrix is formed by polymerizing polymers in a millimeter-level macroporous-mesoporous carbon sphere, and the mass of the carbon base-polymer composite matrix is 0.5-40 times that of the calixcrown. The adsorbent prepared by the method disclosed by the invention has strong selectively and high adsorption capacity to Cs(I) in simulated high-level liquid waste containing Na(I), K(I), Ru(I), Cs(I), Sr(II), Ba(II), La(III) and U(VI); and the adsorbent is simple in preparation technology, resistant to chemicals, heat and radiation, excellent in mechanical properties and easyin post-treatment.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel reprocessing, and relates to an adsorbent, a preparation method and application thereof. Background technique [0002] After the spent fuel elements are reprocessed to separate and recover the useful nuclides U, Pu and a part of Np, other fragmentation products enter the high level liquid waste (High Level Liquid Waste, HLLW), in which 137 The high heat generation of Cs is considered to be one of the factors affecting the safety of HLLW vitrified body; 135 The half-life of Cs is as long as 2×10 6 It is easy to migrate, and has great potential harm to the environment. If Cs is effectively separated before solidification, it can not only reduce the volume of the solidified body, shorten the cooling time and storage life, but also simplify the geological disposal process and save costs. [0003] At present, the liquid-liquid extraction technology based on calixarene is one of the feasible met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30G21F9/12
CPCB01J20/20B01J20/22G21F9/12
Inventor 张志宾刘云海董志敏戴荧曹小红柳玉辉王有群柳和生
Owner EAST CHINA UNIV OF TECH
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