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Ordered large-mesoporous copper gallate gas-sensitive material with high specific surface area and preparation method of ordered large-mesoporous copper gallate gas-sensitive material

A high specific surface area, gas-sensing material technology, applied in the field of high specific surface area ordered large mesoporous copper gallate gas-sensing materials and its preparation, can solve the problems of high cost and large volume, and achieve high sensitivity, low detection limit, The effect of increasing the sensitivity

Pending Publication Date: 2022-06-14
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, mass spectrometers and gas chromatographs are mainly used for the detection of acetone gas, but these detection devices have defects such as high cost and large volume.

Method used

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  • Ordered large-mesoporous copper gallate gas-sensitive material with high specific surface area and preparation method of ordered large-mesoporous copper gallate gas-sensitive material
  • Ordered large-mesoporous copper gallate gas-sensitive material with high specific surface area and preparation method of ordered large-mesoporous copper gallate gas-sensitive material
  • Ordered large-mesoporous copper gallate gas-sensitive material with high specific surface area and preparation method of ordered large-mesoporous copper gallate gas-sensitive material

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preparation example Construction

[0028] The invention relates to an ordered and large mesoporous copper gallate acetone gas-sensing material with high specific surface area and a preparation method thereof. The preparation process is as follows: firstly, mesoporous silica is prepared by soft template method at 35°C or 40°C; then copper nitrate and gallium nitrate precursors are melted at a certain temperature and fully oscillated with mesoporous silica to grind uniformly; Then it is calcined in an air atmosphere; the silica template is removed with a certain concentration of sodium hydroxide solution to obtain the required high specific surface area ordered large mesoporous copper gallate material, which is characterized in that the material is made of copper gallate spiral The nanowires are periodically arranged in cubic form. The diameter of the nanowires is about 5nm. 2 / g. The invention has the following effects: the high specific surface area ordered large mesoporous copper gallate gas sensing material ...

Embodiment 1

[0040] Mix 72g of surfactant P123, 2.6L of deionized water and 120ml of hydrochloric acid with a concentration of 37wt%, and stir for 12h at a constant temperature of 35°C in a water bath until the surfactant is completely dissolved and dispersed evenly, then add 72g of n-butanol and stir for 2 Hours later, 154.8 g of tetraethyl orthosilicate (TEOS) was added, and after stirring at a constant temperature of 35 °C in a water bath for 24 hours, it was transferred to a polytetrafluoroethylene bottle, and then hydrothermally reacted in a 40 °C blast drying oven for 24 hours. After natural cooling, it was filtered by suction, washed with deionized water until neutral, and transferred to a blast drying oven at 70°C for drying for 12 hours to obtain mesoporous silica containing surfactant; then the obtained mesoporous silica (sample) was The surfactant P123 was calcined in air at 550°C for 6 hours, and after removing P123, a white powder was obtained, which was mesoporous silica witho...

Embodiment 2

[0045] Mix 72g of surfactant P123, 2.6L of deionized water and 120ml of hydrochloric acid with a concentration of 37wt%, and stir for 12h at a constant temperature of 35°C in a water bath until the surfactant is completely dissolved and dispersed evenly, then add 72g of n-butanol and stir for 2 After 1 hour, 154.8 g of tetraethyl orthosilicate (TEOS) was added, and after stirring at a constant temperature of 35 °C in a water bath for 24 hours, it was transferred to a polytetrafluoroethylene bottle, and then hydrothermally reacted in a blast drying oven at 80 °C for 24 hours. After natural cooling, it was filtered by suction, washed with deionized water until neutral, and transferred to a blast drying oven at 70°C for drying for 12 hours to obtain mesoporous silica containing surfactant; After calcining at 550℃ for 6h to remove P123, white powder was obtained, that is, mesoporous silica without surfactant;

[0046] Mix and disperse 0.2424g copper nitrate and 0.8424g gallium nit...

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Abstract

The invention relates to an ordered large-mesopore copper gallate gas-sensitive material with a high specific surface area and a preparation method of the ordered large-mesopore copper gallate gas-sensitive material. The material is characterized in that the material is formed by periodically arranging copper gallate spiral nanowires in a cubic mode, the diameter of the nanowires is 3-5 nm, the formed mesoporous structure is large mesopores of 10-12 nm, and the specific surface area is 110-150 m < 2 > / g. The spinel type (AB2O4) semiconductor material copper gallate has an ordered structure with a high specific surface area, and also has the characteristics of high response speed, short recovery time, low working temperature, excellent gas-sensitive performance and the like for trace acetone gas detection.

Description

technical field [0001] The invention relates to a high specific surface area ordered large mesoporous copper gallate gas sensing material and a preparation method thereof. Background technique [0002] As we all know, acetone is an important organic solvent and is widely used in medicine, plastics, pesticides and coatings and other industries. Acetone is a slightly toxic gas with a low boiling point and is highly volatile at room temperature, which easily stimulates the respiratory tract of the human body, causing discomfort to the human body, and adverse symptoms such as headache, nausea and vomiting. In addition, in the field of biomedicine, acetone is also an important biomarker to characterize diabetes. The concentration of acetone gas in the exhaled gas of healthy people is usually 0.3-0.8ppm, while the concentration of acetone gas in the exhaled gas of diabetic patients is higher than 1.8ppm. Therefore, it is necessary to develop an acetone sensor with high sensitivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00G01N27/12
CPCC01G15/00G01N27/127C01P2004/50C01P2004/16C01P2004/64C01P2006/12C01P2006/17C01P2006/14C01P2006/16C01P2004/04
Inventor 赖小勇邵晨杨晓梅王晓中郭茹马金苗
Owner NINGXIA UNIVERSITY
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