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A hamburger-like CO prepared from zif-67 3 o 4 Methods and applications of gas-sensitive materials

A technology of ZIF-67 and gas-sensitive materials, applied in the direction of cobalt oxide/cobalt hydroxide, etc., to achieve the effect of mild reaction conditions

Inactive Publication Date: 2021-06-22
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers have successfully synthesized Co with different morphologies using ZIF-67 as a template. 3 o 4 , but based on ZIF-67 as a synthetic raw material, a hamburger-like Co 3 o 4 At present, there is no relevant research report on the method, and the synthesis method also has the advantages of mild reaction conditions, simplicity and convenience.

Method used

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  • A hamburger-like CO prepared from zif-67 <sub>3</sub> o <sub>4</sub> Methods and applications of gas-sensitive materials
  • A hamburger-like CO prepared from zif-67 <sub>3</sub> o <sub>4</sub> Methods and applications of gas-sensitive materials
  • A hamburger-like CO prepared from zif-67 <sub>3</sub> o <sub>4</sub> Methods and applications of gas-sensitive materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step S1: Weighing 5.8500 g of hexahydrate and 6.5400 g 2-methylimidazole in methanol, stirred at room temperature for 12min, then stationary overnight, after the reaction, washed with methanol, centrifuge, and finally put it 65 ° C oven Dry dry to get ZIF-67;

[0019] Step S2: Take the ZIF-67 obtained by the mass ratio of 8: 7 and the ion water dissolved in the ion water dissolved in the ion water dissolved in the ion water dissolved in the ion water, stirred at room temperature for 5 min and transferred to the hydrothermal reaction kettle in 120 The hydrothermal reaction of ° C was 1 h, and then cooled after the reaction was completed, washed, dried to give the product;

[0020] Step S3: Place the product obtained by step S2 in the tube furnace, temperature warming up to 300 ° C in the air atmosphere of 5 ° C / min, and finally obtained the hamburger CO 3 O 4 Gas sensitive material.

Embodiment 2

[0022] Step S1: Weighing 5.8500 g of hexahydrate and 6.5400 g 2-methylimidazole in methanol, stirred at room temperature for 12min, then stationary overnight, after the reaction, washed with methanol, centrifuge, and finally put it 65 ° C oven Dry dry to get ZIF-67;

[0023] Step S2: Take the ZiF-67 obtained by the mass ratio of 8: 8 and the cobalt-dissolved ion water dissolved in the ion water dissolved in the ion water dissolved in the ion water, stirred at room temperature for 5 min and transferred to the hydrothermal reaction kettle in 120 The water is 1.5 h at ° C, and then cooled after the reaction is completed, washed, dried to give the product;

[0024] Step S3: Place the product obtained in step S2 in the tube furnace, temperature temperature temperature above the temperature of 7 ° C / min in the air atmosphere to heat the temperature of 2.5 h, and finally the burger-shaped CO 3 O 4 Gas sensitive material.

Embodiment 3

[0026] Step S1: Weighing 5.8500 g of hexahydrate and 6.5400 g 2-methylimidazole in methanol, stirred at room temperature for 12min, then stationary overnight, after the reaction, washed with methanol, centrifuge, and finally put it 65 ° C oven Dry dry to get ZIF-67;

[0027] Step S2: Take the mass ratio of 8: 9, the ziF-67 and the hexahydrate cobalt-dissolved ion water dissolved in the ion water dissolved in the ion water, stirred at room temperature for 5 min and transferred to the hydrothermal reaction kettle in 140 The hydrothermal reaction of ° C is 2 h, and then cooled after the reaction is completed, washed, dried to give the product;

[0028] Step S3: The product obtained by step S2 is placed in a tube furnace, and the temperature is warmed to 400 ° C in the air atmosphere of 9 ° C / min for 2 h, and finally the burger CO is obtained. 3 O 4 Gas sensitive material.

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Abstract

The invention discloses a hamburger-like Co 3 o 4 The gas-sensitive material method is to dissolve cobalt nitrate hexahydrate and 2-methylimidazole in methanol, stir at room temperature, and then stand overnight. After the reaction is completed, wash with methanol, centrifuge, and finally dry in an oven at 65°C Obtain ZIF-67; the obtained ZIF-67 and cobalt nitrate hexahydrate are dissolved in deionized water in a mass ratio of 8:7 to 8:10 to form a uniform mixed solution, stirred at room temperature for 5min, and then transferred to a hydrothermal reaction kettle Hydrothermal reaction at 120~150℃ for 1~2.5h, after the reaction is completed, cool, wash, and dry to obtain the product; put the obtained product in a tube furnace, and heat up at 5~10℃ / min in the air atmosphere Raise the temperature to 300-450°C for 2-3 hours, and finally obtain a hamburger-like Co 3 o 4 gas sensitive material. The invention has the advantages of mild reaction conditions, simplicity and convenience.

Description

Technical field [0001] The present invention belongs to the inorganic functional material CO 3 O 4 In the field of synthesis, it is specifically related to the preparation of hamburi Co as raw materials as ZIF-67. 3 O 4 Method of gas sensitive material and its application. Background technique [0002] With the development of my country's economy, the industrial level is also gradually improved. It has brought a large amount of gas in the production and life to air. These gases not only pollute the environment, but also damage human health. In order to be able to detect people's lives and work in real time, the use of gas sensors is increasingly valued, and the preparation of gas sensitive materials in gas sensors is also very important, and there are many common gas sensitive materials, such as zinc oxide, dioxide. Tin, three iron oxide, etc. CO 3 O 4 It is a black or gray powder solid, since it has a high sensitivity and low price, it can be used as an excellent gas sensitive m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04
CPCC01G51/04
Inventor 娄向东潘楠楠崔佳宝陈俊霞李培培
Owner HENAN NORMAL UNIV