Composite ion exchanger, preparation method and applications thereof

A composite ion and exchanger technology, applied in the direction of ion exchange, cation exchange, cation exchange materials, etc., can solve the problems of separation difficulty, low reuse rate, difficult recovery, etc.

Inactive Publication Date: 2020-05-12
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size of this type of sulfide material is micron or several millimeters, and it is difficult to separate the material from the water body in the process of water pollution treatment, so there are difficulties in recycling and low reuse rate in practical applications. shortcoming
[0005] Therefore this application utilizes the polymer material and contains [Sn 3 S 7 ] n 2n- The sulfide material in the anion layer is compounded to solve the shortcomings of difficult recovery and low reuse rate when the sulfide material is used alone to remove radioactive ions in water. Especially in this application, the composite material is prepared into a spherical ion exchanger, which is beneficial to the actual Solid-liquid separation in the process of wastewater treatment, easy to operate, provides a high-efficiency removal of radioactive waste 137 Cs and / or 90 A Novel Composite Ion Exchanger of Sr

Method used

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  • Composite ion exchanger, preparation method and applications thereof
  • Composite ion exchanger, preparation method and applications thereof
  • Composite ion exchanger, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0099] The preparation of embodiment 1 composite ion exchanger, Cs + and Sr 2+ Ion removal rate test

[0100] Preparation of sample 1#;

[0101] Containing [Sn 3 S 7 ] n 2n- The selection of layered sulfides with anion framework [(CH 3 ) 2 NH 2 ] 4 / 3 [(CH 3 ) 3 NH] 2 / 3 sn 3 S 7 1.25H 2O, synthesized according to existing reports (CN104399538A, J. Mater. Chem. A, 2015, 3, 5665-5673).

[0102] In the examples, unless otherwise specified, containing [Sn 3 S 7 ] n 2n- The layered sulfide and layered sulfide of the anion skeleton both refer to [(CH 3 ) 2 NH 2 ] 4 / 3 [(CH 3 ) 3 NH] 2 / 3 sn 3 S 7 1.25H 2 O.

[0103] Take 1.0g particle size less than 100 mesh containing [Sn 3 S 7 ] n 2n- Dissolve the layered sulfide of the anionic skeleton in 6mL dimethyl sulfoxide, and stir for 30min at a speed of 400rpm; then add 0.4g polyacrylonitrile and continue heating to 40°C to make the solution viscous; These viscous liquids were added dropwise to a large amou...

Embodiment 2

[0115] The structural characterization of embodiment 2 sample

[0116] Containing [Sn 3 S 7 ] n 2n- The layered sulfides with anion framework, sample PAN and sample 1# were characterized by field emission scanning electron microscopy (FE-SEM) and X-ray powder diffraction phase analysis (XRD).

[0117] figure 2 (a) Field emission scanning electron microscope (FE-SEM) image of the sample layered sulfide; figure 2 (b) is the field emission scanning electron microscope (FE-SEM) image of sample 1#. Field emission scanning electron microscopy (FE-SEM) characterization results showed that sample 1# maintained the layered structure of sulfide, and the surface was evenly distributed with PAN particles, and these PAN particles were in a dispersed state without obvious aggregation. Therefore, it can be concluded that polyacrylonitrile and layered sulfide compound to form layered sulfide / PAN spherical composite ion exchanger does not change the phase structure of polyacrylonitrile...

Embodiment 3

[0119] Example 3 Sample 1# removes Cs + and / or Sr 2+ Ionic performance test

[0120] Take 18mL of a solution containing 3000ppm cesium chloride, then add 18mg of sample 1#, the mixture is stirred at room temperature for 10h, then the mixture is centrifuged to get the supernatant and the initial solution to determine its Cs by atomic absorption spectrometry or plasma emission spectrometry + Concentrations before and after exchange. The ion exchange product was filtered and washed thoroughly with distilled water, ethanol and acetone in sequence to obtain Cs + The product after ion exchange is denoted as sample 1#—Cs.

[0121] Take 18mL of a solution containing 1000ppm strontium chloride, then add 18mg of sample 1#, the mixture is stirred at room temperature for 10h, and then the mixture is centrifuged to take the supernatant and the initial solution to determine its Sr by atomic absorption spectrometry or plasma emission spectrometry. 2+ Concentrations before and after excha...

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Abstract

The invention discloses a composite ion exchanger, which comprises a layered sulfide material containing a [Sn3S7]n<2n-> anion skeleton and a polymer, and a preparation method thereof. The method comprises the following steps: mixing a sulfide material containing a [Sn3S7]n<2n-> anion layered skeleton and a polymer, and heating to obtain a mixed solution; and adding the mixed solution into water in a dropwise manner, condensing into balls, cleaning, and drying to obtain the composite ion exchanger. The preparation method has the advantages of simplicity, easiness in operation, cheap and easilyavailable raw materials, low cost, good adsorption effect and the like. The composite ion exchanger has the advantages of rapid kinetic response, high adsorption capacity, high selectivity, wide pH activity range and easiness in elution when adsorbing Cs<+> and/or Sr<2+> ions, and has important significance for recovering high-radioactivity elements in a water environment and treating radioactivepollution.

Description

technical field [0001] The invention belongs to the field of material preparation and radioactive waste liquid treatment, and relates to a cheap and easy-to-obtain composite ion exchanger and a method for efficiently removing and recovering radioactive cesium / strontium elements in water. Background technique [0002] Energy and the environment have always been the two major themes in the development of today's society. Fossil energy is non-renewable and causes a series of environmental problems in the process of utilization. With the depletion of global fossil energy, people are gradually focusing on nuclear energy and other efficient and clean new energy sources. However, nuclear power plants and other nuclear energy facilities will produce a large amount of radioactive waste liquid during operation (Environ. ), if not handled properly, it will bring serious radioactive pollution to the environment and pose a huge threat to human survival and development (Radiation Protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/16B01J39/18B01J39/20G21F9/12
CPCB01J39/16B01J39/18B01J39/20G21F9/12
Inventor 李继龙孙海燕冯美玲黄小荥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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