Preparation method for MOF crystal form transformation

A technology of crystal transformation and ionic liquid, which is applied in the preparation of MOF crystal transformation and metal organic framework preparation, to achieve the effect of accelerating crystallization

Active Publication Date: 2020-07-24
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method for MOF crystal form transformation
  • Preparation method for MOF crystal form transformation
  • Preparation method for MOF crystal form transformation

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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 form transformation. The preparation method comprises the following steps: dissolving organic ligand 2-methylimidazole (HIm) by adopting amixed solvent of ionic liquid and water, and mixing with a Zn inorganic salt aqueous solution to realize structural transformation from 2D MOF to 3D MOF, wherein the ionic liquid is a hydrophilic functional solvent composed of imidazole cations, the 2D MOF is two-dimensional zeolite imidazole ester (ZIF-L), and the converted 3D MOF is three-dimensional zeolite imidazole ester (ZIF-8). The preparation method disclosed by the invention not only can realize conversion of an MOF skeleton structure, but also can accelerate nucleation and crystallization of MOF and regulate and control product morphology, and is an environment-friendly method for preparing zeolite imidazolate MOFs with different structures and morphologies.

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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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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