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A kind of preparation method of zif-67 nano flower

A technology of ZIF-67 and nanoflowers, which is applied in the field of preparation of ZIF-67 nanoflowers, which achieves the effects of low equipment requirements, simple operation and convenient large-scale production

Active Publication Date: 2022-02-01
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no ZIF-67 nanoflower and its preparation method and related reports have been seen yet.

Method used

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  • A kind of preparation method of zif-67 nano flower
  • A kind of preparation method of zif-67 nano flower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] With methanol as solvent, prepare 0.75 mol L -1 Cobalt nitrate solution and 1.5 mol L -1 2-Methylimidazole solution, 5 mL each of the above solutions was mixed, ultrasonically treated, and then left to stand for 24 h, and the resulting precipitate was washed, filtered and dried to obtain the product. The product was characterized by scanning electron microscope and transmission electron microscope, and the results are as follows: figure 1 with figure 2 As shown, the resulting product is a nanoflower morphology with a sheet structure, that is, a ZIF-67 nanoflower. The size of the obtained ZIF-67 nanoflowers is 2-5 μm, the thickness of the sheet structure in the obtained ZIF-67 nanoflowers is 0.3-0.7 um, and the BET specific surface area of ​​the obtained ZIF-67 nanoflowers is 801 m 2 g -1 .

Embodiment 2

[0023] With methanol as solvent, prepare 0.0625 mol L -1 Cobalt acetate solution and 0.5 mol L -1 2-Methylimidazole solution, 10 mL each of the above solutions was mixed, ultrasonically treated, and then left to stand for 12 h, and the resulting precipitate was washed, filtered and dried to obtain the product. The product was characterized by scanning electron microscopy and transmission electron microscopy, and the results showed that the obtained product was a nanoflower with a sheet structure, namely ZIF-67 nanoflower. The size of the obtained ZIF-67 nanoflowers is 2-5 μm, the thickness of the sheet structure in the obtained ZIF-67 nanoflowers is 0.3-0.7 um, and the BET specific surface area of ​​the obtained ZIF-67 nanoflowers is 500 m 2 g -1 .

Embodiment 3

[0025] With ethanol as solvent, prepare 0.1 mol L -1 Cobalt nitrate solution and 0.6 mol L -1 2-Methylimidazole solution, 10 mL each of the above solutions was mixed, ultrasonically treated, and then left to stand for 0.5 h, and the resulting precipitate was washed, filtered and dried to obtain the product. The product was characterized by scanning electron microscopy and transmission electron microscopy, and the results showed that the obtained product was a nanoflower with a sheet structure, namely ZIF-67 nanoflower. The size of the obtained ZIF-67 nanoflowers is 2-5 μm, the thickness of the sheet structure in the obtained ZIF-67 nanoflowers is 0.3-0.7 um, and the BET specific surface area of ​​the obtained ZIF-67 nanoflowers is 612 m 2 g -1 .

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Abstract

The invention discloses a preparation method of ZIF‑67 nanoflowers, which comprises the following steps: (1) respectively dissolving cobalt salt and 2‑methylimidazole in the same solvent to form a clarification of cobalt salt and 2‑methylimidazole solution; (2) mix the two solutions prepared in (1) at a volume ratio of 1:0.8-1.2, and after ultrasonic treatment, let the above mixture stand for 0.5-24 h; (3) mix the mixture obtained in (2) After washing and filtering, ZIF‑67 nanoflowers can be prepared. The preparation method of the invention can be prepared statically at normal temperature, has simple operation, low requirements on equipment, and is convenient for large-scale production. The morphology of the ZIF-67 obtained in the present invention is a nanoflower structure, the size of the ZIF-67 nanoflower is 2-5 μm, the thickness of the sheet structure in the ZIF-67 nanoflower is 0.3-0.7 um, and the BET ratio of the ZIF-67 nanoflower is Surface area 500‑1000 m 2 g ‑1 .

Description

technical field [0001] This patent relates to the technical field of nanomaterials, in particular to a method for preparing ZIF-67 nanoflowers. Background technique [0002] ZIF-67 is a cobalt-based zeolite imidazolate framework material, which is formed by self-assembly of divalent cobalt ions and 2-methylimidazole. It has a porous structure similar to molecular sieves and a large specific surface area, and these characteristics can be applied to high-efficiency catalysis and separation processes. ZIF-67 combines the advantages of high stability in inorganic zeolites with high porosity and organic functions of MOFs, controllable size, uniform pore rules, post-modification, excellent thermal and chemical stability, etc. more and more attention. [0003] At present, the reported morphology of ZIF-67 is mostly nano-dodecahedron and two-dimensional nanosheets. For example, the document Nat. Mater. (2007) doi:10.1038 / nmat1927 first reported ZIF-67 whose morphology is nano-dod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00B82Y40/00
CPCC08G83/008B82Y40/00
Inventor 肖业鹏纪红兵任清刚胡玮杰陶磊明程辉成郭鹏虎陈亚举
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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