Preparation method of metal organic skeleton compound and oxidized graphene composite microspheres having uniform appearance

A metal-organic framework and graphene composite technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems of uneven product morphology, difficult industrialization, and difficult to control, and achieve improved conductivity, uniform size, high The effect of nitrogen content

Inactive Publication Date: 2017-12-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems existing in the preparation process of the composite material of ZIF-8 and GO at present, the technical problem to be solved in the present invention is: adding GO in the process of synthesizing ZIF-8 at present, the appearance of the product obtained is not uniform, it is difficult to control, and the yield Low, limited to laboratory level, difficult to industrialize

Method used

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  • Preparation method of metal organic skeleton compound and oxidized graphene composite microspheres having uniform appearance
  • Preparation method of metal organic skeleton compound and oxidized graphene composite microspheres having uniform appearance

Examples

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Effect test

Embodiment 1

[0033] A method for preparing metal-organic framework compound / graphene oxide composite microspheres with uniform appearance, the steps are as follows:

[0034] Disperse ZIF-8 and graphene oxide in deionized water respectively to prepare a ZIF-8 dispersion with a concentration of 2 mg / mL and a graphene oxide dispersion with a concentration of 2 mg / mL, and slowly add ZIF-8 to the graphene oxide In the dispersion, stir while adding, the mixing ratio is 1:1, and then spray-dry the obtained mixed solution. The spray-drying conditions are: the inlet air temperature is 150°C, the feeding speed is adjusted by a peristaltic pump, and the feeding speed is 10mL / min, the compressed air flow rate is 600L / h, the compressed air pressure is 5-8bar, and the airflow velocity is 35m 3 / h, and the outlet air temperature was 80°C to prepare ZIF-8 / GO composite microspheres.

[0035] X-ray diffraction patterns of ZIF-8 and the prepared ZIF-8 / GO composite microspheres are as follows: figure 1 As s...

Embodiment 2

[0039] A method for preparing metal-organic framework compound / graphene oxide composite microspheres with uniform appearance, the steps are as follows:

[0040] Disperse ZIF-8 and graphene oxide in deionized water respectively to prepare a ZIF-8 dispersion with a concentration of 2 mg / mL and a graphene oxide dispersion with a concentration of 2 mg / mL, and slowly add ZIF-8 to the graphene oxide In the dispersion liquid, stir while adding it, the mixing ratio is 2:1, and then spray dry the obtained mixed liquid. The spray drying conditions are: the inlet air temperature is 150°C, the feeding speed is adjusted by a peristaltic pump, and the feeding speed is 10mL / min, the compressed air flow rate is 600L / h, the compressed air pressure is 5-8bar, and the airflow velocity is 35m 3 / h, and the outlet air temperature was 80°C to prepare ZIF-8 / GO composite microspheres.

Embodiment 3

[0042] A method for preparing metal-organic framework compound / graphene oxide composite microspheres with uniform appearance, as shown in Example 1, the difference is:

[0043] The spray drying conditions are: the inlet air temperature is 160°C, the feed rate is adjusted by a peristaltic pump, the feed rate is 12mL / min, the compressed air flow rate is 1000L / h, the compressed air pressure is 5-8bar, and the outlet air velocity is 35m 3 / h, the outlet air temperature is 85°C.

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Abstract

The invention relates to a preparation method of metal organic skeleton compound and oxidized graphene composite microspheres having uniform appearance. The method comprises mixing a metal organic skeleton compound dispersion liquid with an oxidized graphene dispersion liquid, and performing spray drying to prepare composite microspheres. According to the spray drying method, the obtained microspheres are uniform in size and high in yield, and have the yield in a range of 70-85% and the average size at about 1.5 mum. To avoid agglomeration of oxidized graphene at a high temperature, ZIF-8 can be converted to nanometer porous carbon at a high temperature, and N-doped nanometer porous carbon and graphene composite microspheres having high specific surface area and nitrogen content. Through high-temperature carbonization treatment, the composite microspheres are improved in conductivity, and can be applied to aspects of CO2 adsorption, super capacitors, batteries, catalysis and separation.

Description

technical field [0001] The invention relates to a preparation method of a metal-organic framework compound / graphene oxide composite microsphere with uniform appearance, which belongs to the technical field of new material preparation. 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 wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/04
CPCB01J13/043
Inventor 侯士峰姚晨雪郑逸群刘靓蕾王华张军峰
Owner SHANDONG UNIV
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