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Preparation method of ZIF-21 crystal

A ZIF-21, crystal technology, applied in the field of nanomaterial preparation, can solve the problems of uneven particle size, high heating temperature, long reaction time, etc., and achieve the effect of uniform particle size, low reaction temperature and short time.

Inactive Publication Date: 2020-05-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing methods such as solvothermal method and stirring method have problems such as long reaction time, high heating temperature, uneven particle size and low crystallinity, so it is of great significance to find an efficient and controllable synthetic method

Method used

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  • Preparation method of ZIF-21 crystal
  • Preparation method of ZIF-21 crystal
  • Preparation method of ZIF-21 crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Example: at room temperature, measure 0.5 mL of DMF and place it in a vial, weigh Co(NO 3 ) 2 ∙6H 2 O 13 mg, poured into a vial filled with 0.5 mL of DMF, and placed on a magnetic stirrer, started stirring, and set aside. Measure 0.5 mL of DMF into another vial, weigh 30 mg of purine, and pour it into it. After the solution is clarified, use a 1 mL syringe to draw the DMF solution of purine, and gradually drop it in at a rate of 3-4 drops / s Cobalt nitrate solution in DMF. Then use another syringe to draw 0.2 mL of dimethylamine in methanol solution and inject it into the above solution. After continuing to stir for 30 min, put it into an ultrasonic cleaner, set the temperature to 45 °C, and continue ultrasonication for 6 h. After the end, add an appropriate amount of absolute ethanol-water (volume ratio 1:1) to disperse, and centrifuge, and repeat several times of centrifugation and washing.

[0023] Scanning electron microscopy (SEM) was carried out on the above p...

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Abstract

The invention discloses a preparation method of a ZIF-21 crystal. The preparation method comprises the following steps: adding an N,N-dimethylformamide solution of purine into an N,N-dimethylformamidesolution of Co(NO3)2.6H2O; adding a dimethylamine solution a mixed solution obtained in the previous step, and carrying out magnetic stirring; and then performing ultrasonic treatment and centrifugalwashing to obtain the ZIF-21 crystal which is high in crystallinity, uniform in size and of a dodecahedral structure. Due to the adoption of an ultrasonic synthesis method, crystallinity is high, anda particle size is uniform; and the method is simple in process, low in reaction temperature, short in time and suitable for batch production.

Description

technical field [0001] The invention relates to a method for preparing micro-nano materials, in particular to a method for preparing ZIF-21 crystals, and belongs to the field of nano-material preparation. Background technique [0002] Metal Organic Framework (MOF) is a three-dimensional porous structure, generally using metal ions as connection points, and organic ligands to support the coordination polymer that forms a 3D extension of space. Another important class of new porous materials has wide applications in catalysis, energy storage and separation. MOF materials have many unique advantages, such as MOF and its derived nanostructures provide controllable porosity and huge surface area, which facilitates electrolyte access to electrodes and ensures a large electrolyte / electrode contact area; electron and ion diffusion lengths can be significantly shortened, which is beneficial to improve the rate performance of MOF-derived nanostructured electrodes. In addition, MOFs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00
CPCC08G83/008
Inventor 朱荣妹段慧宇庞欢
Owner YANGZHOU UNIV
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