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Highly selective sensitive material for trimethylamine and hydrogen sulfide

A sensitive material, hydrogen sulfide technology, applied in the field of sensing, can solve the problems of many interfering molecules, time-consuming, insufficient activity, etc.

Inactive Publication Date: 2019-07-23
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many detection methods for trimethylamine, the simpler ones include acid-base titration and Kjeldahl nitrogen distillation, but the analysis results of these two methods have large errors and are only used for preliminary determination; spectrophotometry, ion chromatography, and efficient Liquid chromatography, headspace gas chromatography, pre-column derivatization gas chromatography, direct injection gas chromatography, gas chromatography, etc. have high precision and accurate detection, but the disadvantage is that the analysis steps are complex, time-consuming and require expensive equipment
[0004] Invention patent ZL 201210170269.5 discloses a nano-sensitive material for trimethylamine, which also has a certain response signal to dimethylamine, triethylamine, sulfur dioxide and hydrogen sulfide; invention patent ZL 201210014216.4 discloses a nano Sensitive materials, this sensitive material also has response signals to sulfur dioxide, carbon monoxide and formaldehyde; it can be seen that their selectivity is still insufficient, and the trimethylamine sensor and hydrogen sulfide sensor made of public sensitive materials will have false alarms when used
Kaili Yu and others published a paper on Sensors and Actuators B: Chemical, using NiO as a sensitive material for hydrogen sulfide to carry out relevant research, but subsequent applications found that the selectivity is also very insufficient, with many interfering molecules and insufficient activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Dysprosium nitrate hexahydrate is dissolved in 5% acetic acid aqueous solution to form solution A, and zirconium oxychloride octahydrate and zirconium tetrachloride are dissolved in 15% isocitric acid aqueous solution to form solution B; Under stirring, slowly add solution A to solution B dropwise, continue to stir for 2 hours, add ammonium molybdate crystals directly to the mixed solution and stir until completely dissolved, then add carboxymethyl cellulose until a viscous gel is formed solution; age the colloidal solution for more than 10 hours, dry it in an oven at 90°C, then ash it in a crucible, transfer it to a box-type resistance furnace and raise the temperature to 220°C at a rate of no more than 2°C per minute, Keep this temperature for 3 hours, continue to heat up to 350°C at a rate of no more than 2°C per minute, keep this temperature for 6 hours, and naturally cool to room temperature to obtain the Dy 2 o 3 、MoO 3 and ZrO 2 Composed of composite powder ma...

Embodiment 2

[0015] Dysprosium sulfate octahydrate is dissolved in 6% acetic acid aqueous solution to form solution A, and zirconium acetate and zirconium oxynitrate are dissolved in 14% isocitric acid aqueous solution to form solution B; under continuous stirring, Solution A was slowly added dropwise to solution B, and after continuing to stir for 2 hours, ammonium molybdate crystals were directly added to the mixed solution and stirred until completely dissolved, then carboxymethyl cellulose was added to form a viscous colloidal solution; The colloidal solution is aged for more than 10 hours, dried in an oven at 90°C, then ashed in a crucible, transferred to a box-type resistance furnace, and heated to 225°C at a speed of no more than 2°C per minute, and kept at this temperature for 4 Hours, continue to heat up to 360°C at a rate of no more than 2°C per minute, keep this temperature for 5 hours, and naturally cool to room temperature to obtain the Dy 2 o 3 、MoO 3 and ZrO 2 Composed of...

Embodiment 3

[0019] Dysprosium chloride hexahydrate and dysprosium oxalate decahydrate are dissolved in 7% acetic acid aqueous solution to form solution A, and zirconium sulfate tetrahydrate is dissolved in 13% isocitric acid aqueous solution to form solution B; Under stirring, slowly add solution A to solution B dropwise, continue to stir for 2 hours, add ammonium molybdate crystals directly to the mixed solution and stir until completely dissolved, then add carboxymethyl cellulose until a viscous gel is formed solution; age the colloidal solution for more than 10 hours, dry it in an oven at 90°C, then ash it in a crucible, transfer it to a box-type resistance furnace and raise the temperature to 230°C at a speed of no more than 2°C per minute, Keep this temperature for 4 hours, continue to heat up to 370°C at a rate of no more than 2°C per minute, keep this temperature for 6 hours, and naturally cool to room temperature to obtain the Dy 2 o 3 、MoO 3 and ZrO 2 Composed of composite pow...

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PUM

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Abstract

The invention relates to a highly selective sensitive material for trimethylamine and hydrogen sulfide, which is characterized in that the material is the composite powder material composed of Dy2O3,MoO3 and ZrO2. The preparation method comprises the steps of uniformly mixing acetic acid aqueous solution of dysprosium salt and isocitric acid aqueous solution of zircon salt; directly adding ammonium molybdate crystals into the mixture; adding carboxymethylcellulose to form a thick colloidal solution; and aging, drying, calcinating at two stages and naturally cooling to acquire the composite powder material composed of Dy2O3, MoO3 and ZrO2. A gas sensor manufactured by using the sensitive material provided by the invention can measure the trace trimethylamine and hydrogen sulfide in the airwith high sensitivity on the scene without being interfered by other common coexisting molecules.

Description

technical field [0001] The present invention relates to a kind of highly selective sensitive material of trimethylamine and hydrogen sulfide, especially by Dy 2 o 3 、MoO 3 and ZrO 2 A composite powder material composed of the invention belongs to the field of sensing technology. Background technique [0002] Trimethylamine is a gaseous pollutant, a colorless gas with fish oil odor at room temperature, and is the main source of fishy smell. Trimethylamine has a strong stimulating effect on human eyes, nose, throat and respiratory tract, and long-term exposure is more harmful. The presence and concentration of trimethylamine is an important indicator for evaluating the quality of meat and fish food, an odor indicator that characterizes certain metabolic defect diseases, the main object of environmental odor pollution control, and the key to the quality control of certain industrial and agricultural production parameter. Hydrogen sulfide is a flammable, colorless gas with...

Claims

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Application Information

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IPC IPC(8): G01N31/10G01N21/76
CPCG01N21/766G01N31/10
Inventor 周考文杨馥秀谷春秀王欣竹
Owner BEIJING UNION UNIVERSITY
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