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A kind of preparation method for mof crystal transformation

A technology of crystal transformation and ionic liquid, which is used in the production of bulk chemicals to achieve the effect of accelerating crystallization

Active Publication Date: 2021-11-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, there is no information about the conversion of 2D ZIF-L (metal centered Co) to 3D ZIF-8

Method used

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  • A kind of preparation method for mof crystal transformation
  • A kind of preparation method for mof crystal transformation
  • A kind of preparation method for mof crystal transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition of solution B was changed, and 1.30 g of HIm was dissolved in a mixed solvent composed of 39.75 g of water and 0.25 g of ionic liquid 1-hexyl-3-methylimidazolium chloride to form solution B, and the rest were the same as in comparative example 1. Its XRD such as figure 1 As shown, the obtained ZIF-L / ZIF-8 mixed crystal form. Scanning electron microscopy shows irregular leaf morphology, such as figure 2 (b) shown.

Embodiment 2

[0029] The composition of solution B was changed, and 1.30 g of HIm was dissolved in a mixed solvent composed of 37.5 g of water and 2.5 g of ionic liquid 1-hexyl-3-methylimidazolium chloride to form solution B, and the rest were the same as in comparative example 1. Its XRD such as figure 1 As shown, the obtained ZIF-L / ZIF-8 mixed crystal form. Immediately after the solution AB was mixed, a large number of precipitates were produced, and the crystallization speed was obviously accelerated. Scanning electron microscopy reveals irregular particles such as figure 2 (c) shown.

Embodiment 3

[0031] The composition of solution B was changed, and 1.30 g of HIm was dissolved in a mixed solvent composed of 35 g of water and 5 g of ionic liquid 1-hexyl-3-methylimidazolium chloride to form solution B, and the rest were the same as in Comparative Example 1. Immediately after the solution AB was mixed, a large amount of precipitates were produced, and its XRD was as follows: figure 1 As shown, a single crystal form of ZIF-8 was obtained. Scanning electron microscopy shows regular-sized particles, about 400nm, such as figure 2 (d) shown.

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Abstract

The invention discloses a preparation method for MOF crystal transformation. The organic ligand 2-methylimidazole (HIm) is dissolved in a mixed solvent of ionic liquid and water, and mixed with Zn inorganic salt solution to realize the structural transformation of 2D MOF to 3D MOF; the ionic liquid is a kind of imidazolium cation The hydrophilic functional solvent formed; the 2D MOF is a two-dimensional zeolite imidazolate (ZIF-L), and the 3D MOF transformed into is a three-dimensional zeolite imidazolate (ZIF-8). The preparation method of the present invention can not only realize the transformation of the MOF skeleton structure, but also accelerate the nucleation and crystallization of the MOF, and regulate the morphology of the product, and is an environmentally friendly method for preparing zeolite imidazolate MOFs with different structures and shapes.

Description

technical field [0001] The invention belongs to the technical field of coordination chemistry and crystal chemistry, and specifically relates to a method for preparing a metal organic framework, in particular to a method for preparing MOF crystal transformation. Background technique [0002] ZIFs is a kind of porous material similar to zeolite framework, which is linked by imidazole derivatives as ligands, and belongs to N-heterocyclic MOFs. Generally, it is composed of imidazole organic ligands and transition metal ions Zn 2+ A polymer formed by linking nitrogen atoms. Because of their large specific surface area and good stability, ZIFs show broad application potential in catalysis, adsorption and separation, etc. Regulating the crystal size, morphology, and crystal structure of ZIFs plays an important role in changing their properties and functions. [0003] The preparation of ZIFs is often carried out by solution synthesis, and its morphology can be regulated by chang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00
CPCC08G83/008Y02P20/54
Inventor 桑欣欣倪才华石刚王大伟夏晓峰
Owner JIANGNAN UNIV
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