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Method of synthesizing and preparing zeolitic imidazolate framework material ZIF-8 nanometer six-foot body by using seed growth

A technology of ZIF-8 and zeolite imidazolate, which is applied in the field of preparation of ZIF-8 nano-hexapods, can solve the problems of difficulty in controlling the nucleation and growth stages, and limit the control and innovation of ZIF-8 morphology, and achieve morphology Effects with precise control, multiple possibilities, and simple conditions

Active Publication Date: 2019-03-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods are one-step synthesis methods, which are difficult to control during the nucleation and growth stages, which limits the control and innovation of ZIF-8 morphology

Method used

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  • Method of synthesizing and preparing zeolitic imidazolate framework material ZIF-8 nanometer six-foot body by using seed growth
  • Method of synthesizing and preparing zeolitic imidazolate framework material ZIF-8 nanometer six-foot body by using seed growth

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Effect test

Embodiment 1

[0034] A method for using seed growth synthesis to prepare zeolite imidazolate framework material ZIF-8 nano hexapods, comprising steps as follows:

[0035] (1) 24 μmol of zinc nitrate, 1.32 mmol of 2-methylimidazole, 1.92 μmol of cetyltrimethylammonium bromide, and 3 mL of water were mixed and dissolved at room temperature, and the mixture was incubated at room temperature for 3 hours. The reaction solution was washed to obtain ZIF-8 cube seeds, and dispersed in 3 mL of water to obtain a seed dispersion.

[0036] (2) Mix and dissolve 48 μmol of zinc nitrate, 1.32 mmol of 2-methylimidazole, 1.44 μmol of cetyltrimethylammonium bromide, 200 μL of seed dispersion, and 3 mL of water at room temperature, and keep the mixture in After 3 hours at room temperature, the reaction solution was washed to obtain the ZIF-8 nano-hexapod product.

[0037] ZIF-8 nanometer hexapod product scanning electron microscope (SEM) figure that the present embodiment makes, as figure 1 , 2 shown. Dep...

Embodiment 2

[0039] A method for using seed growth synthesis to prepare zeolite imidazolate framework material ZIF-8 nano hexapods, comprising steps as follows:

[0040] (1) 24 μmol of zinc nitrate, 1.32 mmol of 2-methylimidazole, 1.92 μmol of cetyltrimethylammonium bromide, and 3 mL of water were mixed and dissolved at room temperature, and the mixture was incubated at room temperature for 3 hours. The reaction solution was washed to obtain ZIF-8 cube seeds, and dispersed in 3 mL of water to obtain a seed dispersion.

[0041] (2) Mix and dissolve 48 μmol of zinc acetate, 1.32 mmol of 2-methylimidazole, 1.44 μmol of cetyltrimethylammonium bromide, 200 μL of seed dispersion, and 3 mL of water at room temperature, and keep the mixture in After 3 hours at room temperature, the reaction solution was washed to obtain the ZIF-8 nano-hexapod product.

Embodiment 3

[0043] A method for using seed growth synthesis to prepare zeolite imidazolate framework material ZIF-8 nano hexapods, comprising steps as follows:

[0044] (1) 24 μmol of zinc nitrate, 1.32 mmol of 2-methylimidazole, 1.92 μmol of cetyltrimethylammonium bromide, and 3 mL of water were mixed and dissolved at room temperature, and the mixture was incubated at room temperature for 3 hours. The reaction solution was washed to obtain ZIF-8 cube seeds, and dispersed in 3 mL of water to obtain a seed dispersion.

[0045] (2) Mix and dissolve 48 μmol of zinc sulfate, 1.32 mmol of 2-methylimidazole, 1.44 μmol of cetyltrimethylammonium bromide, 200 μL of seed dispersion, and 3 mL of water at room temperature, and keep the mixture in After 3 hours at room temperature, the reaction solution was washed to obtain the ZIF-8 nano-hexapod product.

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Abstract

The invention relates to a method of synthesizing and preparing a zeolitic imidazolate framework material ZIF-8 nanometer six-foot body by using seed growth. The method comprises the following steps of (1) mixing and dissolving zinc salt, an imidazole ligand, a surfactant and water at room temperature, performing thermal insulation for 2-4 h at room temperature, performing washing to obtain ZIF-8cube seeds, and then dispersing the ZIF-8 cube seeds into water to obtain a seed dispersion liquid; and (2) stirring, mixing and dissolving the zinc salt, the imidazole ligand, the surfactant, the seed dispersion liquid and a solvent at room temperature, performing thermal insulation for 1-12 h at room temperature, and performing washing to obtain a ZIF-8 nanometer six-foot body product. Accordingto the method provided by the invention, the ZIF-8 nanometer six-foot body is prepared by using a seed growth method, the seeds which are synthesized in advance instead of a precursor are selected asa starting point of crystal growth. Compared with a one-step synthesis method, the method can avoid a complex and difficultly controlled initial nucleation step and accurately controls the growth stage from angles of thermodynamics and dynamics.

Description

Technical field: [0001] The invention relates to a method for preparing ZIF-8 nanometer hexapods, belonging to the technical field of crystal material synthesis. Background technique: [0002] Zeolitic imidazolate frameworks (ZIFs) are a class of metal-organic frameworks (MOFs) with a zeolite framework structure, in which the transition metals are mainly divalent Zn, Co, etc., and the organic ligands are imidazole or imidazole derivatives. Compared with traditional zeolites, transition metal ions replace Si elements and Al elements in traditional zeolites, and imidazolate replaces oxygen bridges in traditional zeolites, which is a zeolite-like structure material connected by nitrogen atoms on imidazole rings. . [0003] ZIF-8 is a kind of zeolite imidazolate framework material (ZIFs), which is composed of 2-methylimidazole and metal atom Zn as the most basic unit, in which each Zn atom is coordinated with four N atoms on the 2-methylimidazole ring bit, forming a ZnN with r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 侯士峰布吉东
Owner SHANDONG UNIV
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