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Modified metal organic framework nano-sheet and preparation method thereof

A metal-organic framework and organic framework technology, applied in the field of membrane separation, can solve the problems of macromolecular gas diffusion, gas separation selectivity decline, layer gap increase, etc., to achieve high gas separation performance, good universality, and repeatability. high effect

Inactive Publication Date: 2020-06-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Two-dimensional molecular sieve nanosheets have excellent skeleton flexibility, which leads to uneven spacing of slit channels between nanosheet layers, making macromolecular gases easy to diffuse in the interlayer slit channels
In addition, H 2 The temperature of the separation process is usually above 200°C, and almost all nanosheet membranes expand as the temperature rises, and the interlayer gap increases, which promotes more macromolecular gases to permeate the membrane, resulting in a sharp drop in gas separation selectivity

Method used

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  • Modified metal organic framework nano-sheet and preparation method thereof
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  • Modified metal organic framework nano-sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Zn 2 (bim) 4 Preparation of layered precursors

[0050] Dissolve 0.612 g of zinc chloride in 23 ml of N,N-dimethylformamide and stir for 20 minutes;

[0051] Dissolve 0.354 g of benzimidazole in a mixture of 23 ml of N,N-dimethylformamide and 0.22 g of diethylamine, and stir for 20 minutes;

[0052] Pour the latter solution into the former solution, stir for 5 minutes, Zn 2+ , The molar ratio of benzimidazole, diethylamine and N,N-dimethylformamide is 1.5:1:1:200;

[0053] The mixed solution was transferred to a reaction kettle, reacted at 130°C for 42 hours, centrifuged to obtain the reaction product, dispersed with methanol several times, centrifuged, and dried overnight at 60°C.

[0054] X-ray diffraction confirms that the product has a c-axis orientation stacked layered structure (see figure 1 ), and its (002) characteristic peak appears near 9°; scanning electron microscope pictures show that the particle size of the product is micron order, with obvious shar...

Embodiment 2

[0056] Zn 2 (Bim) 3 preparation of

[0057] Mix 3 grams of zinc nitrate hexahydrate and 0.6 grams of benzimidazole and add them to 90 milliliters of N,N-dimethylformamide, dissolve them evenly in a water bath with ultrasonic waves, transfer them to a reaction kettle, and react at 100 degrees Celsius for 72 hours. After repeated centrifugation and washing with methanol, the product was first dried at 60°C overnight, and then dried in a vacuum oven at 150°C for 24 hours.

[0058] X-ray diffraction showed that the product had a layered crystal structure (see image 3 ), the scanning electron microscope photo shows that the Zn 2 (bim) 3 The particles are diamond-like in shape, with obvious layered structure (see Figure 4 ).

Embodiment 3

[0060] Two-dimensional Zn 2 (bim) 4 Preparation of nanosheets

[0061] Take by weighing 0.025 gram of embodiment 1 gained Zn 2 (bim) 4 Add 10 milliliters of methanol to the powder before layering, dilute to 250 milliliters with methanol after grinding at 60 rpm for 1 hour, and ultrasonicate in a circulating water bath at 600 watts for 30 minutes to obtain Zn 2 (bim) 4 The nanosheet dispersion before layering was left to stand for a week to precipitate unexfoliated blocky large particles.

[0062] Atomic force microscope pictures show that the thickness of nanosheets is 1-4 nm, and it is 1-4 layers of nanosheets (see Figure 5 ).

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Abstract

The invention relates to a modified metal organic framework nano-sheet and a preparation method thereof, and belongs to the field of membrane separation. The preparation method disclosed by the invention comprises the following steps: mixing an organic matter for modifying a metal organic framework nano-sheet and a metal organic framework nano-sheet, wherein the organic matter is a long-chain alkane organic amine or imidazole compound, and the organic matter accounts for 0.002-50 wt% of the mixture of the organic matter and the metal organic framework nano-sheet; and reacting at a temperatureof room temperature to 100 DEG C to obtain the modified metal organic framework nano-sheet. The supported nano-sheet membrane prepared by the invention has high gas separation performance, high repeatability and good universality, and a modification strategy and a membrane preparation method can be applied to other two-dimensional nano-sheet materials.

Description

technical field [0001] The invention relates to a modified metal-organic framework nanosheet and a preparation method thereof, belonging to the field of membrane separation. Background technique [0002] Energy saving and emission reduction technology is one of the keys to achieve sustainable development and environmental friendliness. The separation process accounts for 40-60% of the total energy consumption of the process industry, so the energy saving and emission reduction of the separation process has become one of the key concerns of global scientific researchers. Membrane separation has significant advantages such as low energy consumption, high separation efficiency, easy operation, and low carbon emissions. It can be used in many fields such as gas separation, seawater desalination, water pollution control, and pharmaceuticals. The gas separation membrane market is currently dominated by polymer membranes, but their thermal stability and chemical stability are not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D71/06B01D67/00
CPCB01D53/228B01D67/0002B01D71/06
Inventor 杨维慎彭媛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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