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Bis-imidazole polyionic liquid and metal organic framework composite material as well as preparation method and application thereof

A metal-organic framework, polyionic liquid technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve problems such as ionic liquid mobility hindering application, achieve fast adsorption speed, increase specific surface area, and highly efficient sequential effect

Pending Publication Date: 2021-06-04
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, imidazole-based ionic liquids are considered to capture TcO due to their rich nitrogen elements. 4 - (ReO 4 - ), but the fluidity of ionic liquids hinders its application

Method used

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  • Bis-imidazole polyionic liquid and metal organic framework composite material as well as preparation method and application thereof
  • Bis-imidazole polyionic liquid and metal organic framework composite material as well as preparation method and application thereof
  • Bis-imidazole polyionic liquid and metal organic framework composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Bis-imidazole polyionic liquid and metal-organic framework composite material (1) 0.7g-P[C 4 (VIM) 2 ]Cl 2 @MIL-101

[0040] The preparation method is as follows:

[0041] (1) bisethyleneimidazole polyionic liquid ([C 4 (VIM) 2 ]Cl 2 )Synthesis

[0042] Mix 10.35g (0.11mol) of 1-vinylimidazole and 6.35g (0.05mol) of 1,4-dichlorobutane in 40mL of anhydrous methanol, heat to 353K under nitrogen atmosphere, stir at reflux for 48h, and cool to room temperature. The product was precipitated with a large amount of ethyl acetate and dried overnight at 323K under vacuum to obtain [C 4 (VIM) 2 ]Cl 2 .

[0043] (2) Synthesis of MIL-101

[0044] Mix 1.32g of terephthalic acid, 3.2g of chromium nitrate nonahydrate and 2.2mL of glacial acetic acid in 40mL of deionized water, stir at room temperature for 30min, place the resulting suspension in a Teflon-lined autoclave, and heat up to 473K to react for 9h . The product was repeatedly washed with a large amount ...

Embodiment 2

[0081] Example 2 y-P[C 4 (VIM) 2 ]Cl 2 @MIL-101 composite material as adsorbent for TcO 4 - (ReO 4 - ) removal

[0082] ReO 4 - is a kind with TcO 4 - A structurally similar non-radioactive analog, in the laboratory, ReO 4 - Often used to assess TcO 4 - removal effect.

[0083] (1) Effect of input ratio of DVB to ionic liquid on adsorption performance of adsorbent

[0084] Method: Take 0.16g of MIL-101 after high temperature activation, 0.6g[C 4 (VIM) 2 ]Cl 2 , press DVB and [C 4 (VIM) 2 ]Cl 2 The molar ratios of the molar feeds were 0.5:1, 1:1, 2:1, 3:1. Add DVB and 0.029g AIBN, mix them in a mortar, then add 15mL of absolute ethanol, grind gently until the surface is dry to ensure well mixed. Then, the obtained mixture was transferred to a sealed three-necked flask, and heated to 353K for 24 h under the protection of nitrogen. The resulting product was washed with ethanol and methanol several times to remove unreacted monomers, and dried overnight at 3...

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Abstract

The invention relates to a bis-imidazole polyionic liquid and metal organic framework composite material as well as a preparation method and application thereof. The bis-imidazole polyionic liquid and metal organic framework composite material is P[C4 (VIM)2]Cl2@MIL-101, and is synthesized by taking bis-vinyl imidazole ionic liquid [C4(VIM)2]Cl2 as an adsorption functional group, divinyl benzene DVB as a cross-linking agent, 2, 2-azobisisobutyronitrile AIBN as an initiator and MIL-101 as a base material through a physical grinding heterogeneous method. The preparation method provided by the invention is simple, green and environment-friendly, saves energy consumption, has good adsorption performance on radioactive metal technetium and scattered metal rhenium, and has practical applicability.

Description

technical field [0001] The invention belongs to the technical field of adsorption material synthesis, and in particular relates to a composite material of bis-imidazole polyionic liquid and metal-organic framework, a preparation method thereof and an application in absorbing radioactive metal technetium. Background technique [0002] Technetium ( 99 Tc) is one of the most dangerous radioactive isotopes in nuclear waste, with a long half-life (t 1 / 2 =2.13×10 5 yrs), high nuclear fission yield, strong environmental fluidity, and strong volatility of waste liquid vitrification process. 99 Tc is mainly in the stable oxidation state (TcO 4 - ) in the form of nuclear fuel wastewater. TCO 4 - High solubility (11.3mol L -1 , 20°C), it is very easy to spread on the surface of the earth's crust, and poses a huge threat to the water environment. However, due to the interference of strong radiation field, high pH and a large number of coexisting ions in the system, it can be se...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30B01J20/34G21F9/12
CPCB01J20/226B01J20/267B01J20/3475G21F9/12
Inventor 娄振宁黄孟楠赵雯艳卢安平郝晓迈熊英单炜军
Owner LIAONING UNIVERSITY
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