High-performance adsorption film based on ZIFs material

A high-performance, thin-film technology, applied in the fields of adsorption water/sewage treatment, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of poor operability and processability, poor dispersion of hydrophobic ZIFs powder, poor adsorption performance, etc. Achieve high removal rate, improve adsorption and separation efficiency, and simple membrane production process

Inactive Publication Date: 2020-01-14
BEIJING FORESTRY UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0003] However, the poor dispersibility of hydrophobic ZIFs powder in aqueous solution is not conducive to fully exerting its adsorption performance. Its crystalline properties and powdery form result in poor operability and processability of ZIFs materials. For example, it is difficult to quickly and simply recover ZIFs powder after adsorption.

Method used

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  • High-performance adsorption film based on ZIFs material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0013] Add an appropriate amount of cobalt acetate to 15ml of ethanol, mix and heat in a water bath at 60°C for 30 minutes, then add ethanolamine solution at a ratio of cobalt acetate to ethanolamine molar volume ratio of 1.8mol / L, and then continue heating the reaction system in a water bath at 60°C for 0.5h to obtain a cobalt-based sol ; use a smooth glass rod to coat a certain thickness of cobalt-based sol on the surface of the polyvinylidene fluoride (PVDF) film, and heat-treat the PVDF film with the sol coating at 150 ° C for 30 min to evaporate the solvent and obtain a continuous cobalt-based gel. Adhesive layer; at 150°C, place the PVDF film with cobalt-based sol layer in sufficient 2-methylimidazole gas phase monomer to grow ZIF-67 material by vapor phase growth method; after natural cooling, the ZIF-67 film is obtained, and the The film was washed with methanol several times and dried at room temperature to obtain ZIF-67 adsorption film.

[0014] ZIF-67 adsorption fil...

Embodiment 2

[0018] Add an appropriate amount of zinc acetate to 15ml of ethanol, mix and heat in a water bath at 60°C for 30 minutes, then add ethanolamine solution at a ratio of 2.0mol / L by molar volume ratio of zinc acetate to ethanolamine, and then continue heating the reaction system in a water bath at 60°C for 0.5h to obtain a zinc-based sol ; Use a smooth glass rod to coat a certain thickness of zinc-based sol on the surface of polyvinylidene fluoride (PVDF) film, and heat-treat the PVDF film with sol coating at 150 ° C for 30 min to evaporate the solvent and obtain a continuous zinc-based gel. Adhesive layer; at 150°C, place the PVDF film with zinc-based sol layer in sufficient 2-methylimidazole gas phase monomer to grow ZIF-8 material by vapor phase growth method; after natural cooling, ZIF-8 film is obtained, and the The film was washed with methanol several times and dried at room temperature to obtain ZIF-8 adsorption film. The adsorption test of the ZIF-8 adsorption film is th...

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Abstract

The invention discloses a specific method for rapidly preparing a ZIFs adsorption film by using a vapor phase growth method. The preparation method comprises: coating the surface of a base film with acobalt/zinc-based sol, putting the base film into a drying oven, heating and aging to obtain a cobalt/zinc-based gel coating film, and carrying out a reaction on the cobalt/zinc-based gel coating film and a 2-methylimidazole gas-phase ligand through a gas-phase growth method to prepare the ultrathin ZIFs adsorption film. According to the invention, the preparation method is simple in process, hascontrollability, and is expected to be further applied to preparation of other types of metal organic framework material adsorption films.

Description

technical field [0001] The invention relates to the preparation of an ultra-thin ZIFs adsorption film by using a gel vapor deposition method to realize the separation performance of fast and efficient adsorption. The ZIFs adsorption membrane prepared by the invention utilizes the pore structure of the base membrane to load the ZIFs nanoparticles, which improves the powder form of the ZIFs particles, effectively increases the contact between the ZIFs particles and pollutants in water, and improves the adsorption and separation performance. Background technique [0002] Metal-organic framework materials are porous materials composed of multidentate organic ligands containing oxygen or nitrogen (mostly aromatic polyacids and polybases) and transition metal ions; because of their high porosity and large specific surface area , low density, good chemical stability, controllable pore structure and other characteristics, once discovered, they have attracted great attention from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28
CPCB01J20/226B01J20/28033C02F1/285
Inventor 王璐莹代娟雷建都
Owner BEIJING FORESTRY UNIVERSITY
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