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ZnO@ZIF-8 core-shell structure microsphere and preparation method thereof

A technology of ZIF-8 and core-shell structure, which is applied in the field of core-shell structure microspheres and its preparation, can solve the problems of easy agglomeration of rod-shaped products, lower specific surface area, long reaction time, etc., and achieve excellent photoelectric and piezoelectric properties, specific surface area Large, good dispersion effect

Inactive Publication Date: 2015-04-29
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the product and its preparation method have disadvantages. First, the rod-shaped product is easy to agglomerate, resulting in a decrease in effective specific surface area, which is not conducive to its practical application; secondly, the preparation method requires a very long reaction time. not conducive to actual production

Method used

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  • ZnO@ZIF-8 core-shell structure microsphere and preparation method thereof
  • ZnO@ZIF-8 core-shell structure microsphere and preparation method thereof
  • ZnO@ZIF-8 core-shell structure microsphere and preparation method thereof

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Embodiment 1

[0035] The concrete steps of preparation are:

[0036] Step 1: First, according to the weight ratio of 3.5:250, zinc acetate dihydrate was added to diethylene glycol, and refluxed at 140° C. for 2 hours to obtain a reaction solution. After the reaction solution is cooled to room temperature, it is sequentially subjected to solid-liquid separation, washing and drying; wherein, the solid-liquid separation process is centrifugation with a rotating speed of 2000r / min and a time of 6min, and the washing process is to use ethanol to The separated solid matter is cleaned once, and the separation of the solid matter during cleaning is centrifugation, and the drying process is to dry the cleaned solid matter at 60 ° C to obtain an approximate figure 1 Spherical ZnO shown.

[0037] Step 2, according to the weight ratio of 0.008:2.9, adding spherical ZnO into 3.16mol / L 2-methylimidazole ethanol solution, standing and aging for 8min, followed by solid-liquid separation, washing and dryin...

Embodiment 2

[0039] The concrete steps of preparation are:

[0040] Step 1: First, according to the weight ratio of 4.5:250, zinc acetate dihydrate was added to diethylene glycol, and refluxed at 150° C. for 1.8 hours to obtain a reaction solution. After the reaction solution is cooled to room temperature, it is sequentially subjected to solid-liquid separation, washing and drying; wherein, the solid-liquid separation process is centrifugation with a rotating speed of 3000r / min and a time of 5min, and the washing process is to use ethanol to The separated solids are cleaned twice, the separation of solids is centrifugation during cleaning, and the drying process is to dry the cleaned solids at 68 ° C to obtain a similar figure 1 Spherical ZnO shown.

[0041] Step 2, according to the weight ratio of 0.009:2.8, adding spherical ZnO into 3.41mol / L 2-methylimidazole ethanol solution, standing and aging for 21min, followed by solid-liquid separation, washing and drying Treatment; wherein, the...

Embodiment 3

[0043] The concrete steps of preparation are:

[0044] Step 1: First, according to the weight ratio of 5.5:250, zinc acetate dihydrate was added to diethylene glycol, and refluxed at 160° C. for 1.5 h to obtain a reaction solution. After the reaction solution is cooled to room temperature, it is sequentially subjected to solid-liquid separation, washing and drying; wherein, the solid-liquid separation process is centrifugation with a rotating speed of 4000r / min and a time of 4min, and the washing process is to use ethanol to The separated solid matter is washed three times, the separation of the solid matter during cleaning is centrifugation, and the drying process is to dry the cleaned solid matter at 75°C to obtain the following: figure 1 Spherical ZnO shown.

[0045] Step 2, according to the weight ratio of 0.01:2.7, adding spherical ZnO into 3.56mol / L 2-methylimidazole ethanol solution, standing and aging for 34min, followed by solid-liquid separation, washing and drying ...

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Abstract

The invention discloses a ZnO@ZIF-8 core-shell structure microsphere and a preparation method thereof. The core-shell structure microsphere is formed by ZnO and ZIF-8, wherein ZnO is adopted as a core, ZIF-8 is adopted as a shell, the diameter of the spherical ZnO core is 250 to 300 nm, the surface of the spherical ZnO core is a rough surface, the thickness of the ZIF-8 shell is 40 to 60 nm, the ZIF-8 shell is formed by a block-shaped polygonal body, and the specific surface area of each microsphere is more than or equal to 300m<2> / g. The preparation method comprises the following steps: adding dihydrate zinc acetate into diethylene glycol at a weight ratio of (3.5-7.5): 250 to obtain a mixture, refluxing the mixture for at least 1h under the temperature of 140 to 180 DEG C to obtain a reaction liquid, after the reaction liquid is cooled to the room temperature, sequentially carrying out solid-liquid separation, washing and drying treatment on the reaction liquid to obtain spherical ZnO, then adding the spherical ZnO into 3.16 to 4.16 mol / L of 2-methylimidazole solution at a weight ratio of (0.008-0.012): (2.5-2.9) to obtain a mixed solution, standing and aging the mixed solution for 8 to 60 minutes, sequentially carrying out solid-liquid separation, washing and drying treatment on the mixed solution to obtain a target product. The ZnO@ZIF-8 core-shell structure microsphere is good in dispersing property and relatively large in specific surface area and can be widely applied to the fields such as gas storage, separation and catalyzing.

Description

technical field [0001] The invention relates to a core-shell structure microsphere and a preparation method thereof, in particular to a ZnOZIF-8 core-shell structure microsphere and a preparation method thereof. Background technique [0002] ZIF-8 is a porous framework material formed by zinc ions and 2-methylimidazole through coordination bonds, and the pore diameters of its large and small pores are respectively and It has a wide range of applications in the fields of gas storage, separation and catalysis. [0003] As one of the semiconductor materials, zinc oxide has excellent photoelectric and piezoelectric properties. It can be used as a photocatalyst to degrade environmental organic pollutants through oxidation-reduction reactions, fix carbon dioxide during artificial photosynthesis, and so on. [0004] If zinc oxide and ZIF-8 are combined to obtain a composite material with ZnOZIF-8 structure, the excellent properties of zinc oxide and carbon materials can be int...

Claims

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Application Information

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IPC IPC(8): B01J13/02
CPCB01J13/02
Inventor 王献彪刘瑾占传亮丁琰
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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