Use g-c for detecting vocs 3 no 4 Synthesis method of modified porous zinc oxide nanosheet composite gas-sensing material

A technology of porous zinc oxide and gas-sensing materials, which is applied in the field of synthesis of porous zinc oxide nanosheet composite gas-sensing materials, can solve the problems of sample pretreatment and detection procedure complexity, unfavorable analysis and detection on-line detection, and affecting the gas-sensing effect, etc. To achieve the effect of good permeability, good gas sensitivity response and sensitivity, stable and high sensitive response

Active Publication Date: 2021-03-12
SHANDONG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many methods for detecting VOCs, such as gas chromatography, infrared method, SPR photodiode detection method, gravimetric chemical sensor method, catalytic combustion sensor method, photoionization detector method, etc. However, these methods have some shortcomings: analysis and detection The hysteresis is not conducive to online detection; the sample pretreatment and detection procedures are more complicated
will g-C 3 N 4 Materials and tin oxide materials (or rod-shaped zinc oxide materials) are mixed by physical methods such as ultrasonic or grinding to prepare composite materials for gas-sensing detection of VOCs, which have been reported in the literature, but physical methods can easily lead to insufficient recombination between the two materials. Affect the gas sensitivity effect

Method used

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  • Use g-c for detecting vocs <sub>3</sub> no <sub>4</sub> Synthesis method of modified porous zinc oxide nanosheet composite gas-sensing material
  • Use g-c for detecting vocs <sub>3</sub> no <sub>4</sub> Synthesis method of modified porous zinc oxide nanosheet composite gas-sensing material
  • Use g-c for detecting vocs <sub>3</sub> no <sub>4</sub> Synthesis method of modified porous zinc oxide nanosheet composite gas-sensing material

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Effect test

Embodiment 1

[0037] A method using g-C 3 N 4 The synthetic method of the modified porous zinc oxide nanosheet composite gas-sensitive material comprises the following steps:

[0038] (1) Add 15mL 0.2mol / L zinc acetate aqueous solution to 15mL 0.4mol / L urea aqueous solution, ultrasonically disperse for 10min, and then transfer the mixed solution to a 50mL stainless steel autoclave lined with polytetrafluoroethylene , and make it react in an oven at 120°C for 8h. Naturally cool to room temperature, centrifuge and wash with deionized water for 3 times, put in an oven and dry at 60°C for 12 hours to obtain basic zinc carbonate;

[0039] (2) Add commercial melamine reagent powder into 50mL 80°C hot water, stir and dissolve while adding slowly, stop adding according to the solubility until it cannot be completely dissolved, stir and boil, then naturally cool to room temperature, filter and put the obtained solid in Dry in an oven at 60°C for 12 hours to obtain recrystallized melamine;

[0040]...

Embodiment 2

[0044] A method using g-C 3 N 4 The synthetic method of the modified porous zinc oxide nanosheet composite gas-sensitive material comprises the following steps:

[0045] (1) Add 15mL 0.2mol / L zinc acetate aqueous solution to 15mL 0.5mol / L urea aqueous solution, ultrasonically disperse for 10min, and then transfer the mixed solution to a 50mL stainless steel autoclave lined with polytetrafluoroethylene , and make it react in an oven at 120°C for 8h. Naturally cool to room temperature, centrifuge and wash with deionized water for 3 times, put in an oven and dry at 60°C for 12 hours to obtain basic zinc carbonate;

[0046] (2) Add commercial melamine reagent powder into 50mL 80°C hot water, stir and dissolve while adding slowly, stop adding according to the solubility until it cannot be completely dissolved, stir and boil, then naturally cool to room temperature, filter and put the obtained solid in Dry in an oven at 60°C for 12 hours to obtain recrystallized melamine;

[004...

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Abstract

The present invention relates to the use of g-C for detecting VOCs 3 N 4 A method for synthesizing a modified porous zinc oxide nanosheet composite gas-sensing material, comprising the following steps: (1) preparing basic zinc carbonate and recrystallized commercialized melamine respectively, and grinding and mixing the two evenly according to a certain mass ratio; (2) The mixture obtained in step (1) is calcined under the protection of nitrogen to obtain a composite gas-sensitive material. In this method, the chemical synthesis method of precursors is used to synthesize g-C, which has a special interaction with gas molecules containing benzene rings. 3 N 4 Composite on porous zinc oxide nanosheets, with the help of the synergistic effect between the two porous two-dimensional semiconductor materials, the gas-sensing performance of zinc oxide is effectively improved. The material can be used for the gas-sensing detection of benzene-containing volatile organic pollutants and chlorobenzene-like gases. The gas-sensing response is good, the material synthesis method is green and simple, and the repeatability is good. It is easy to realize large-scale production and gas sensing detection applications. .

Description

technical field [0001] The invention relates to a method for detecting VOCs utilizing g-C 3 N 4 The invention discloses a method for synthesizing a modified porous zinc oxide nanosheet composite gas-sensing material, belonging to the field of preparation of inorganic nanometer materials. Background technique [0002] Indoor air quality researchers claim that all the volatile organic compounds they sampled and analyzed indoors are VOCs, and volatile organic compounds (VOCs) are the most serious of the three types of indoor air pollutants. As people spend more time indoors, the relationship between the indoor environment and people becomes closer and more important. There are many methods for detecting VOCs, such as gas chromatography, infrared method, SPR photodiode detection method, gravimetric chemical sensor method, catalytic combustion sensor method, photoionization detector method, etc. However, these methods have some shortcomings: analysis and detection The hysteres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 封振宇占金华
Owner SHANDONG UNIV
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