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Method for synthesizing micro/nano zeolitic imidazolate frameworks (ZIFs)

A technology for zeolite imidazolate and framework structure, which is applied in the field of synthesizing zeolite imidazolate micro-nano framework structure materials, can solve problems such as unfavorable large-scale preparation, waste of organic ligands, time-consuming and energy consumption, etc., and achieves high yield and energy saving , the effect of good appearance

Inactive Publication Date: 2012-02-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] So far, the synthesis of ZIFs generally adopts the traditional solvothermal method, which is not only time-consuming and energy-consuming, but also the size of the obtained particles is mostly in the micron range.
Although some existing methods can synthesize nano / micro-scale ZIFs, such as direct mixing, mechanical method, microwave method, etc., these methods exist for a long time and need to use organic solvents such as methanol, N,N-dimethylformamide, etc. Or the time is short and the use of water as a solvent but a large waste of organic ligands and other shortcomings are not conducive to large-scale preparation
A fast, simple and efficient method for synthesizing nano / micro-sized ZIFs at room temperature has not been reported yet

Method used

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  • Method for synthesizing micro/nano zeolitic imidazolate frameworks (ZIFs)
  • Method for synthesizing micro/nano zeolitic imidazolate frameworks (ZIFs)
  • Method for synthesizing micro/nano zeolitic imidazolate frameworks (ZIFs)

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Embodiment 1

[0024] Example 1, rapid preparation of ZIF-8 at room temperature

[0025] Zn(OAc) 2 2H 2 O (zinc acetate dihydrate) was dissolved in 2 mL of water to make its concentration 0.3M. Dissolve mIm (2-methylimidazole) in 2 mL of water to a concentration of 0.6M. At room temperature, 2 mL of zinc acetate (0.3 M) aqueous solution was added to the above mIm aqueous solution, and stirred for 5 minutes. The resulting precipitate was washed with ethanol and centrifuged, and the supernatant was discarded. Repeat the above operation at least three times, and finally disperse with ethanol. First, it was characterized by SEM (see figure 1 ), it can be seen that the obtained ZIF-8 material is a dodecahedron with a particle size of about 100 nm.

[0026] Gained ZIF-8 nanomaterials were characterized by XRD, such as figure 2 shown. As can be seen, the obtained ZIF-8 nanometer material and standard XRD spectrogram (K.Park, Z.Ni, A. , J.Choi, R.Huang, F.Uribe-Romo, H.Chae, M.O'Keeffe, O...

Embodiment 2

[0027] Example 2, rapid preparation of ZIF-61 at room temperature

[0028] Zn(OAc) 2 2H 2 O (zinc acetate dihydrate) was dissolved in 2 mL of water to make its concentration 0.3 M; Im (imidazole, 1.8 M) and mIm (2-methylimidazole, 0.6 M) were mixed and dissolved in 2 mL of water. At room temperature, 2 mL of zinc acetate (0.3 M) aqueous solution was added to the above mixed aqueous solution of Im and mIm, and stirred for 5 minutes. The resulting precipitate was washed with ethanol and centrifuged, and the supernatant was discarded. Repeat the above operation at least three times, and finally disperse with ethanol. Then it was characterized by SEM (see image 3 ), it can be seen that the obtained material is ZIF-61 with a particle size of about 1 μm.

[0029] The obtained ZIF-61 micron material is characterized by powder XRD, as Figure 4 shown. As can be seen, the obtained ZIF-61 micron material and standard XRD spectrum (R.Banerjee, A.Phan, B.Wang, C.Knobler, H.Furukaw...

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Abstract

The invention discloses a method for quickly and efficiently synthesizing nano / micro zeolitic imidazolate frameworks (ZIFs) based on 2-methylimidazole, benzimidazole and derivatives thereof at room temperature. The method comprises the following steps: mixing metal acetate solution with water or organic solution of single imidazole ligand or two-imidazole mixture ligand to carry out reaction at room temperature, thereby obtaining the nano / micron ZIFs. Conventional reactants can be utilized to prepare the nano / micro ZIFs with uniform granules; and thus, the synthesis method is quick and convenient, has the advantages of energy conservation, high yield and cheap and accessible raw materials and solvents, does not have the problem in safety in common nitrates, is beneficial to industrial production, and has wide application prospects in the fields of catalysis, adsorption, pharmaceutical carriers, nano device construction and the like.

Description

technical field [0001] The invention relates to a method for synthesizing zeolite imidazolate micro-nano framework materials (ZIFs). Background technique [0002] Zeolitic imidazolate frameworks (ZIFs) are a new class of metal-organic frameworks (MOFs) with a zeolite topology. It is a tetrahedral framework formed by divalent metal cations (Zn or Co) bridged by imidazolate. Compared with other MOFs materials, ZIFs not only have large specific surface area and porous characteristics, but also have excellent thermal and chemical stability. Moreover, ZIFs can capture carbon dioxide greenhouse gas with high selectivity, which makes ZIFs have broad application prospects in the fields of carbon dioxide capture and storage, gas separation and sensing, and heterogeneous catalysis. [0003] So far, the synthesis of ZIFs generally adopts the traditional solvothermal method, which is not only time-consuming and energy-consuming, but also the size of the obtained particles is mostly in...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J20/22B01J20/28B01J20/30A61K47/24
Inventor 毛兰群王翔杨丽芬
Owner INST OF CHEM CHINESE ACAD OF SCI
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