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Reparation method of gradient porous metal organic framework ZIF (Zeolitic Imidazolate Framework)-8

A metal-organic framework, ZIF-8 technology, applied in the field of preparation of gradient porous metal-organic framework ZIF-8, can solve the problems of difficult ligand synthesis, interpenetration of material structure, unstable properties, etc., and achieves convenient industrial operation, Stable performance and stable properties

Active Publication Date: 2018-06-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of increasing the length of the ligand has disadvantages such as difficulty in ligand synthesis, low yield, material structure interpenetration, and unstable properties; the surfactant template method needs to remove the template later, which is cumbersome to operate and not easy to industrialize

Method used

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  • Reparation method of gradient porous metal organic framework ZIF (Zeolitic Imidazolate Framework)-8
  • Reparation method of gradient porous metal organic framework ZIF (Zeolitic Imidazolate Framework)-8
  • Reparation method of gradient porous metal organic framework ZIF (Zeolitic Imidazolate Framework)-8

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Experimental program
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Effect test

Embodiment 1

[0027] Weigh 4.10g of 2-methylimidazole into a 250mL beaker, then add 50mL of deionized water, dissolve thoroughly under magnetic stirring, and measure 0.5ml of polydiallyldimethylammonium chloride solution with a pipette (20wt.%) was added in the above-mentioned beaker, stirred and mixed evenly; Weighed 2.20g zinc acetate dihydrate and joined in the 100ml beaker, then added 30ml deionized water to dissolve the divalent zinc salt; Divalent zinc salt solution was mixed with 2-methylimidazole solution, and stirred and reacted for 1.0 h under normal temperature and pressure conditions to obtain a milky white suspension; the white solid product was obtained by filtration or centrifugation, and the product was washed in deionized water Multiple times to remove unreacted monomers or regulators, and the obtained product is dried in a vacuum oven to obtain a gradient porous metal-organic framework ZIF-8.

Embodiment 2

[0029] Weigh 4.10g of 2-methylimidazole into a 250mL beaker, then add 50mL of deionized water, dissolve thoroughly under magnetic stirring, and measure 1.5ml of polydiallyldimethylammonium chloride solution with a pipette (20wt.%) was added in the above-mentioned beaker, stirred and mixed evenly; Weighed 2.20g zinc acetate dihydrate and joined in the 100ml beaker, then added 30ml deionized water to dissolve the divalent zinc salt; Divalent zinc salt solution was mixed with 2-methylimidazole solution, and stirred and reacted at normal temperature and pressure for 1.5 hours to obtain a milky white suspension; the white solid product was obtained by filtration or centrifugation, and the product was washed in deionized water Multiple times to remove unreacted monomers or regulators, and the obtained product is dried in a vacuum oven to obtain a gradient porous metal-organic framework ZIF-8.

Embodiment 3

[0031] Weigh 6.15g of 2-methylimidazole into a 250mL beaker, then add 50mL of deionized water, dissolve thoroughly under magnetic stirring, and measure 0.5ml of polydiallyldimethylammonium chloride solution with a pipette (20wt.%) was added in the above-mentioned beaker, stirred and mixed evenly; Weighed 2.20g zinc acetate dihydrate and joined in the 100ml beaker, then added 30ml deionized water to dissolve the divalent zinc salt; Divalent zinc salt solution and 2-methylimidazole solution were mixed, and stirred and reacted at normal temperature and pressure for 2.0 hours to obtain a milky white suspension; the white solid product was obtained by filtration or centrifugation, and the product was washed in deionized water Multiple times to remove unreacted monomers or regulators, and the obtained product is dried in a vacuum oven to obtain a gradient porous metal-organic framework ZIF-8.

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Abstract

The invention relates to a preparation method of a gradient porous metal organic framework ZIF (Zeolitic Imidazolate Framework)-8. The preparation method comprises the following steps of dissolving anorganic ligand 2-methylimidazole in deionized water, after the 2-methylimidazole is thoroughly dissolved, adding a polydiallyl dimethyl ammonium chloride solution, and uniformly agitating; dissolvinga divalent zinc slat in deionized water, thoroughly dissolving, then mixing with an organic ligand solution, and carrying out an agitation reaction to obtain suspension liquid; filtering or centrifugally separating the suspension liquid to obtain a solid product, washing with deionized water, and then drying, so that a ZIF-8 series material is obtained. Due to the control, to deprotonation balance and the growth process of a crystal, of the positive ions of polydiallyl dimethyl quaternary ammonium, the prepared ZIF-8 series material has microporous and mesoporous structures at the same time,further, is adjustable in mesoporous volume and stable in performance, and is wide in application prospect, and the preparation method disclosed by the invention is simple, convenient, easy and feasible, is green and pollution-free and is convenient to industrially operate.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a preparation method of gradient porous metal organic framework ZIF-8. Background technique [0002] Metal-organic frameworks (MOFs) have the characteristics of high specific surface area, adjustable structure, and permanent pores, which show obvious advantages over traditional porous materials, and have been widely used in adsorption and separation, energy storage, catalysis, sensing, drug loading, etc. field. However, most MOFs materials including zeolitic imidazolate frameworks (ZIFs) only have microporous (<2nm) features, hindering the adsorption of adsorbates, reactants, precursors, or drug molecules with large volumes in the pores. Diffusion limits the extended application of such materials in corresponding fields. [0003] The most direct solution to the above problems is to prepare MOFs materials with mesoporous structure. At present, the methods for prep...

Claims

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Application Information

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IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 张秋禹陈欣张宝亮张和鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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