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Lanthanum-ferrite-doping formaldehyde gas sensitive material and preparation method thereof

A technology of lanthanum ferrite and formaldehyde gas, applied in the fields of material resistance, chemical instruments and methods, iron compounds, etc., can solve the problems of high test conditions, complicated operation, long measurement time, etc., and achieve fast response-recovery time, High sensitivity and selectivity, small resistance change effect

Inactive Publication Date: 2013-06-19
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned various technologies and instruments for detecting formaldehyde gas have deficiencies in varying degrees during use: or they need to sample the site first, and then use special instruments for analysis, the operation is complicated, and the measurement time is long; or they cannot be quantitatively detected. , it is difficult to meet the needs of on-site real-time and convenient detection
[0010] To sum up, at present, conventional quantitative detection methods for formaldehyde at home and abroad (spectroscopy, chromatography, electrochemical methods, etc.) generally have the disadvantages of high test conditions, difficult control, expensive instruments, and large volume. , The research of convenient and practical formaldehyde gas sensor has just started, and the formaldehyde gas sensitive material and corresponding sensor prepared in the existing literature report are all unsatisfactory to formaldehyde sensitivity, selectivity and stability

Method used

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  • Lanthanum-ferrite-doping formaldehyde gas sensitive material and preparation method thereof
  • Lanthanum-ferrite-doping formaldehyde gas sensitive material and preparation method thereof
  • Lanthanum-ferrite-doping formaldehyde gas sensitive material and preparation method thereof

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Effect test

Embodiment 1

[0039] The raw material components are lanthanum nitrate, ferric nitrate, citric acid, polyacrylamide, and magnesium ions. The molar ratio corresponding to the raw material components is 1:1:0.05:0.005:0.2. The raw material of magnesium ions is magnesium sulfate, and the raw materials are analytical pure.

[0040] Weigh lanthanum nitrate and ferric nitrate, dissolve them in distilled water, add citric acid and polyacrylamide, and make a mixed solution. Heat and stir the solution at 40°C, add magnesium ions, mix and stir evenly, react in a microwave reaction device for 1 hour, take it out, put the solution in a water bath at 50°C and stir to make a sol, and continue to stir until the sol turns into a gel state , put the gel in an oven to dry at 50°C, grind the obtained xerogel, place it in a furnace and sinter at 550°C for 3 hours to obtain lanthanum ferrite powder doped with magnesium ions.

Embodiment 2

[0042] The raw material components are lanthanum nitrate, ferric nitrate, citric acid, polyethylene glycol, and cerium ions, and the molar ratio corresponding to the raw material components is 1:1:1.0:0.001:0.4, and the cerium ion raw material is cerium nitrate, and the raw materials are Analytical pure.

[0043] Weigh lanthanum nitrate and ferric nitrate, dissolve them in distilled water, add citric acid and polyethylene glycol, and make a mixed solution. The solution was heated and stirred at 70° C., added with cerium ions, mixed and stirred evenly, aged for 24 hours, and microwaved in a microwave reaction device for 3 hours. Then take it out, put the solution in a water bath at 80°C, stir to make a sol, continue to stir until the sol turns into a gel state, and put the gel in a drying oven at 120°C to dry. The obtained xerogel was ground, placed in a furnace and sintered at 650° C. for 2 hours to obtain lanthanum ferrite powder doped with cerium ions.

Embodiment 3

[0045] The raw material components are lanthanum nitrate, ferric nitrate, citric acid, triethylhexyl phosphoric acid, zirconium and strontium ions, and the molar ratio corresponding to the raw material components is 1:1:1.5:0.001:0.5, wherein the molar ratio of zirconium and strontium ions The ratio is 0.2:0.3, the zirconium ion raw material is zirconium nitrate, the strontium ion raw material is strontium nitrate, and the raw materials are analytically pure.

[0046] Weigh lanthanum nitrate and ferric nitrate, dissolve them in distilled water, add citric acid and triethylhexyl phosphoric acid to form a mixed solution. Put the solution on a magnetic stirrer and heat and stir at 90°C, add zirconium and strontium ions, mix and stir evenly, age for 36 hours, react in a microwave reaction device for 5 hours, take it out, put the solution in a 70°C water bath, Stir to make a sol, continue to stir until the sol turns into a gel state, and place the gel in a drying oven at 200°C to d...

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Abstract

The invention relates to a lanthanum-ferrite-doping formaldehyde gas sensitive material and a preparation method thereof, which belong to the formaldehyde gas sensitive material and the preparation method. The material of the invention comprises raw materials such as lanthanum nitrate, ferric nitrate, citric acid, dispersing agents, metal ions with the similar electronegativity and the ion diameter to iron ions or metal ions with the similar electronegativity and ion diameter to lanthanum ions and the like according to the mol ratio of 1 / 1 / (0.05 to 1.5) / (0.001 to 0.1) / (0.1 to 0.5). The preparation method comprises the steps of solution mixing, microwave reaction, gel drying, grinding and the like. Thereby, the formaldehyde gas sensitive material with the advantages of high sensitivity, good selectivity and high response-recovery time is obtained.

Description

technical field [0001] The invention belongs to a formaldehyde gas-sensing material and a method for preparing the material, in particular to a method for preparing a formaldehyde gas-sensing material in which lanthanum ferrite is doped and modified. Background technique [0002] Formaldehyde (HCHO) is a colorless gas with a special pungent smell at room temperature. It is widely used in synthetic resins, surfactants, rubber, leather, plastics, papermaking, dyes, adhesives, coatings, building materials, Production of industrial products such as disinfection. A large number of materials used in interior decoration, such as building materials, furniture, and various adhesives, will release formaldehyde gas, and the release period of formaldehyde is as long as 3 to 15 years, resulting in a serious excess of formaldehyde concentration in the indoor air, which is harmful to human physical and mental health. Therefore, it is particularly important to detect harmful gases such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04C01G49/00
Inventor 柳清菊张瑾朱忠其刘强
Owner YUNNAN UNIV
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