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Method for preparing biligand film by utilizing in-situ electric field and biligand film prepared by method

A dual-ligand, electric field technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced separation capacity, reduced separation performance, uneven dispersion, etc., to improve production efficiency and reduce costs. The effect of investing and simplifying the operation steps

Inactive Publication Date: 2019-06-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymeric membranes currently dominate the market due to their low cost and ease of preparation, but the membranes tend to plasticize under high feedstream pressures, thereby reducing their separation performance
Ceramic membranes are not easily plasticized, but are brittle and complicated to prepare
Mixed matrix membranes combine the advantages of polymer membranes and ceramic membranes, but the inorganic particle fillers are prone to agglomeration and uneven dispersion in the polymer matrix
Since the inorganic particles are not very compatible with the organic polymer matrix, it is easy to cause voids, thereby reducing its separation ability

Method used

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  • Method for preparing biligand film by utilizing in-situ electric field and biligand film prepared by method
  • Method for preparing biligand film by utilizing in-situ electric field and biligand film prepared by method
  • Method for preparing biligand film by utilizing in-situ electric field and biligand film prepared by method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, ZIF-7 was prepared in one step using the in-situ electric field method 12 -8 membrane, including the following steps:

[0034] (1) Solution A: Mix metallic zinc acetate dihydrate (0.21951g) and dimethylimidazole (0.1642g) and then ultrasonicate for 60s to dissolve it in 20 mL of methanol to obtain solution A.

[0035] (2) Solution B: Dissolve benzimidazole (11.814 mg) in 10 mL of dimethylformamide ultrasonically to obtain solution B. Add solution A to solution B, mix and stand for 2h to obtain a mixed solution and use it as ZIF-7 12 -8 film precursor.

[0036] (3) In-situ electric field next step synthesis ZIF-7 12 -8 Membrane: Immerse the porous anodic aluminum oxide (AAO) substrate into synthetic ZIF-7 12 -8 film precursor liquid, plus 0.7mA·cm -2 When reacting for 20 minutes at room temperature, ZIF-7 will be formed on the surface of AAO 12 -8 film.

[0037] Know ZIF-7 through RASPA 2.0 simulation calculation 12 -8 membrane pore size is

[0038] The resultin...

Embodiment 2

[0043] In this example, ZIF-7 was prepared in one step using the in-situ electric field method 22 -8 membrane, including the following steps:

[0044] (1) Solution A: Mix metallic zinc acetate dihydrate (0.21951g) and dimethylimidazole (0.1642g) and then ultrasonicate for 60s to dissolve it in 20 mL of methanol to obtain solution A.

[0045] (2) Solution B: Dissolve benzimidazole (29.535 mg) in 10 mL of dimethylformamide ultrasonically to obtain solution B. Add solution A to solution B, mix and stand for 3 hours to obtain a mixed solution and use it as ZIF-7 12 -8 film precursor.

[0046] (3) In-situ electric field next step synthesis ZIF-7 22 -8 Membrane: Immerse the porous anodic aluminum oxide (AAO) substrate into synthetic ZIF-7 22 -8 film precursor solution, plus 0.6mA·cm -2 When reacting for 15 minutes at room temperature, ZIF-7 will be formed on the surface of AAO 22 -8 film.

[0047] Know ZIF-7 through RASPA 2.0 simulation calculation 22 -8 membrane pore size is

[0048] The r...

Embodiment 3

[0053] In this example, ZIF-7 was prepared in one step using the in-situ electric field method 50 -8 membrane, including the following steps:

[0054] (1) Solution A: Mix metallic zinc acetate dihydrate (0.21951g) and dimethylimidazole (0.1642g) and then ultrasonicate for 60s to dissolve it in 20 mL of methanol to obtain solution A.

[0055] (2) Solution B: Dissolve benzimidazole (59.07 mg) in 10 mL of dimethylformamide ultrasonically to obtain solution B. Add solution A to solution B, mix and stand for 4 hours to obtain a mixed solution and use it as ZIF-7 12 -8 film precursor.

[0056] (3) In-situ electric field next step synthesis ZIF-7 50 -8 Membrane: Immerse the porous anodic aluminum oxide (AAO) substrate into synthetic ZIF-7 50 -8 film precursor solution, plus 0.5mA·cm -2 When reacting for 25min at room temperature, ZIF-7 will be formed on the surface of AAO 50 -8 film.

[0057] Know ZIF-7 through RASPA 2.0 simulation calculation 12 -8 membrane pore size is

[0058] The resulti...

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Abstract

The invention discloses a method for preparing a biligand film by utilizing an in-situ electric field and the biligand film prepared by the method. The method comprises the following steps: (1) mixingzinc acetate dihydrate and dimethylimidazole, dissolving the mixed material into a solvent to obtain a solution A, and dissolving benzimidazole into a solvent to obtain a solution B; (2) adding the solution A obtained in the step (1) into the solution B, performing mixing, and allowing the mixed material to stand, wherein an appropriate amount of mixed solution is used as a precursor liquid; and(3) immersing a substrate into the precursor liquid obtained in the step (2), applying an electric current for a reaction to obtain the biligand film. The method provided by the invention prepares thebiligand film by the in-situ electric field method, the method is simple and rapid, greatly improves the production efficiency, and has good universality; the biligand film prepared by the in-situ electric field method has no obvious defects on the surface, and has good contact with the substrate without obvious cracks; and the simple high-efficiency in-situ electric field method used in the invention can be completed at normal temperature and pressure, and has no special requirements on the substrate, thereby providing a possibility for mass production.

Description

Technical field [0001] The invention belongs to the technical field of gas separation, and specifically relates to a method for preparing a dual-ligand membrane by using an in-situ electric field and the prepared dual-ligand membrane. Background technique [0002] In modern chemical industrial production, environmental sustainability and economic efficiency are important reference indicators. For some clean energy gases and important chemical raw materials, due to the similarity of physical properties (such as molecular size, boiling point, etc.) and chemical properties (acidity, alkalinity, and instability, etc.), the separation difficulty is greatly increased. On the one hand, for clean energy gas, such as methane, people want to obtain high-purity methane, and they need to invest a certain cost for separation. The traditional separation method-solution absorption method has many disadvantages. Taking the ammonia solution absorption method as an example, its operation is too ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12C08G83/00
Inventor 王海辉侯倩倩周胜魏嫣莹
Owner SOUTH CHINA UNIV OF TECH
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