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Method for enhancing stability of metal organic framework material by ion liquid

A metal-organic framework and material stability technology, applied in the field of metal-organic framework materials and ionic liquids, can solve problems such as low success rate, complicated operation, and poor controllability, and achieve uniform properties, enhanced water stability, and reduced hydrolysis rate Effect

Inactive Publication Date: 2018-06-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a method for enhancing the stability of metal-organic framework materials by ionic liquids. By adding metal-organic framework materials to the precursor solution formed by ionic liquids, the ionic liquids enter Into the pores of metal organic framework materials, the ionic liquid in the pores covers the sites where the original metal organic framework materials are easy to react with water molecules, so that water molecules cannot directly contact with metal organic framework materials, reducing the hydrolysis of metal organic framework materials Speed, improve water stability, thereby solving the problems of complex operation, poor controllability, low success rate and difficulty in achieving the expected effect of the existing technology

Method used

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  • Method for enhancing stability of metal organic framework material by ion liquid
  • Method for enhancing stability of metal organic framework material by ion liquid
  • Method for enhancing stability of metal organic framework material by ion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Dissolve 0.125g of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate in 8.75g of acetone, and stir at a stirring speed of 750r / min for 20min at 25°C to dissolve evenly;

[0038] (2) Add 0.25g metal-organic framework material Cu-BTC to the solution obtained in step (1), and stir at a stirring speed of 750r / min for 20min at 25°C to make it evenly mixed;

[0039] (3) Stir the solution obtained in step (2) at a stirring speed of 750 r / min at 20°C for 6 hours until the acetone is completely volatilized;

[0040] (4) The product obtained in step (3) was first dried in an ordinary oven at 70°C for 10 hours, and then placed in a vacuum oven at 100°C and 0.1kPa for 18 hours to obtain material A;

[0041] (5) 0.2 g of material A obtained in step (4) was placed in 100 mL of deionized water at 25°C for 1 h, 3 h, 6 h, 12 h, and 24 h for water stability testing.

Embodiment 2

[0043] (1) Dissolve 0.125g of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid in 10g of acetone, and stir at a stirring speed of 750r / min for 15min at 25°C to dissolve evenly;

[0044] (2) Add 0.5 g metal-organic framework material Cu-BTC to the solution obtained in step (1), and stir at a stirring speed of 750 r / min for 20 min at 25° C. to make it evenly mixed;

[0045] (3) Stir the solution obtained in step (2) at a stirring speed of 750 r / min at 20°C for 6 hours until the acetone is completely volatilized;

[0046] (4) The product obtained in step (3) was first dried in an ordinary oven at 70°C for 10 hours, and then placed in a vacuum oven at 100°C and 0.5kPa for 18 hours to obtain material B;

[0047] (5) 0.2 g of material B obtained in step (4) was placed in 100 mL of deionized water at 25°C for 1 h, 3 h, 6 h, 12 h and 24 h for water stability testing.

Embodiment 3

[0049] (1) Dissolve 0.15g of 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid in 11g of acetone, and stir at a stirring speed of 1000r / min for 30min at 15°C to dissolve evenly;

[0050] (2) Add 0.35g metal-organic framework material Cu-BTC to the solution obtained in step (1), and stir at a stirring speed of 1000r / min for 30min at 15°C to make it evenly mixed;

[0051] (3) Stir the solution obtained in step (2) at a stirring speed of 1000 r / min at 15°C for 8 hours until the acetone is completely volatilized;

[0052] (4) The product obtained in step (3) was first dried in an ordinary oven at 60°C for 12 hours, and then placed in a vacuum oven at 80°C and 0.5kPa for 24 hours to obtain material C;

[0053] (5) 0.2 g of material C obtained in step (4) was placed in 100 mL of deionized water at 25° C. for 1 h, 3 h, 6 h, 12 h, and 24 h for water stability testing.

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Abstract

The invention belongs to the technical fileds of metal organic framework materials and ion liquid, and discloses a method for enhancing the stability of a metal organic framework material by ion liquid. The method comprises the following steps of (a) selecting ion liquid to be used as a modifying agent of the metal organic framework material to be treated; dissolving the ion liquid into an organicsolvent; performing primary stirring so that the materials are uniformly dissolved to form a precursor solution; (b) adding the metal organic framework material to be treated into the precursor solution; performing secondary stirring so that the precursor solution and the metal organic framework material to be treated realize the sufficient contact, so that the modified metal organic framework material is obtained; after drying, obtaining the required organic framework material. The method has the advantages that the operation is simple; the applicability is high; the method is applicable tothe combination of various metal organic framework materials and ion liquid; the water stability enhancing effect is obvious; an effective path is provided for the application of the metal organic framework material in a humid environment.

Description

technical field [0001] The invention belongs to the technical field of metal-organic framework materials and ionic liquids, and more specifically relates to a method for enhancing the stability of metal-organic framework materials by ionic liquids. Background technique [0002] Metal-organic framework materials are crystalline materials with an ordered structure formed by self-assembly of metal ions or metal clusters and organic ligands. Due to their high porosity and large specific surface area, metal-organic framework materials are widely used in energy and chemical industries. There are good applications. [0003] Ionic liquid is a new type of liquid material composed entirely of anions and cations at room temperature. It has shown great promise in solvent extraction, separation and purification of substances, fuel cells and solar cells, extraction of carbon dioxide from industrial waste gas, separation and treatment of nuclear fuel and nuclear waste, etc. Potential appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00
CPCC08G83/008Y02P20/54
Inventor 冯光夏潇潇李松陈明玉
Owner HUAZHONG UNIV OF SCI & TECH
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