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A method for rapid synthesis of mesoporous biporous zif-8 materials at room temperature

A technology of ZIF-8, medium and micro-holes, applied in chemical instruments and methods, alkali metal compounds, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of restricting the entry of macromolecules, interpenetration, and rapid collapse and other issues, to achieve the effect of mild conditions, energy saving and low price

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MOFs constructed with longer ligands tend to collapse rapidly after ligand removal, leading to interpenetration of multiple pores, which greatly reduces the pore size and thus limits the access of macromolecules.

Method used

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  • A method for rapid synthesis of mesoporous biporous zif-8 materials at room temperature
  • A method for rapid synthesis of mesoporous biporous zif-8 materials at room temperature
  • A method for rapid synthesis of mesoporous biporous zif-8 materials at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 0.285g of zinc oxide in 5mL of deionized water and stir for 20 minutes to obtain a zinc oxide solution; dissolve 1.097g of zinc acetate dihydrate in 5mL of deionized water and stir for 10 minutes to obtain a zinc acetate solution; Dimethylimidazole was dissolved in 5mL N,N-dimethylformamide, and stirred for 10 minutes to obtain 2-methylimidazole solution; the zinc oxide solution was mixed with zinc acetate solution, and stirred for 20 minutes to obtain a mixed solution of zinc oxide and zinc acetate ; Add 2-methylimidazole solution and 1.07g hexadecane bromide to the mixed solution of zinc oxide and zinc acetate, and stir for 20 minutes; Suction filter the resulting product, put it into a vacuum oven at 110°C and dry it for 10 hours, The obtained medium and micro biporous ZIF-8 material is marked as sample A.

Embodiment 2

[0036] Dissolve 0.296g of zinc oxide in 5mL of deionized water and stir for 30 minutes to obtain a zinc oxide solution; dissolve 1.097g of zinc acetate dihydrate in 5mL of deionized water and stir for 20 minutes to obtain a zinc acetate solution; Dissolve imidazole in 5mL N,N-dimethylformamide, stir for 20 minutes to obtain 2-methylimidazole solution; mix zinc oxide solution and zinc acetate solution, and stir for 30 minutes to obtain a mixed solution of zinc oxide and zinc acetate; Add 2-methylimidazole solution and 1.11 g of hexadecane bromide to the mixed solution of zinc oxide and zinc acetate, and stir for 30 minutes; filter the resulting product with suction, and dry it in a vacuum oven at 120°C for 12 hours to obtain A mesomicro biporous ZIF-8 material, marked as sample B.

[0037] The medium-micro-double-porous ZIF-8 material prepared in Example 1 was used as a representative for analysis. The analysis results of the medium-micro-double-porous ZIF-8 material prepared i...

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Abstract

The invention discloses a method for rapidly synthesizing a micro-mesoporous ZIF-8 material at normal temperature. By using the method, the synthesis time can be successfully shortened to 20min. The method comprises the following steps: firstly, dissolving zinc oxide into water; secondly, dissolving zinc acetate dehydrate into water; thirdly, dissolving 2-methylimidazole into N,N-dimethylformamide; fourthly, mixing a zinc oxide solution with a zinc acetate solution, and carrying out sufficient stirring; fifthly, adding a 2-methylimidazole solution and bromohexadecane into a mixed solution of zinc oxide and zinc acetate, and carrying out sufficient stirring; and sixthly, carrying out suction filtering on the obtained product, and drying the product to obtain a hierarchical porous ZIF-8 material. Due to the addition of zinc oxide and bromohexadecane serving as a templating agent, not only is the method simple and convenient to operate and mild in condition, but also the synthesis time isgreatly shortened. The product has an abundant porous structure, not only has high specific surface area, but also is stable in structure and has a relatively good application prospect on aspects ofmacromolecule adsorption and catalysis.

Description

technical field [0001] The invention belongs to the field of rapid preparation of multi-level porous metal-organic frameworks, and in particular relates to a method for rapidly synthesizing medium-micro-double-porous ZIF-8 materials at normal temperature. Background technique [0002] In the past two decades, metal-organic frameworks (MOFs), as emerging porous materials, have aroused great interest among researchers. [Zhou H C, Long J R, Yaghi O M. Introduction to metal–organic frameworks [J]. 2012.] The diversity, tunability and porosity of their structures make MOFs have great potential in multifunctional applications. [Liu J, Chen L, Cui H, et al.Applications of metal–organic frameworks inorganic supramolecular catalysis[J].Chemical Society Reviews,2014,43(16):6011-6061.] Among them, the pores of MOFs materials play a role vital role. Although some mesoporous MOFs have been reported[Li P Z, Wang X J, Tan S Y, et al. Clicked isoreticular metal–organic frameworks and thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01J31/16
CPCB01J20/226B01J20/28019B01J20/2808B01J20/28083B01J31/1691
Inventor 奚红霞段崇雄张航李非儿
Owner SOUTH CHINA UNIV OF TECH
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