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Nano-sensitive material for monitoring sulfur dioxide

A sensitive material, sulfur dioxide technology, applied in the field of sensing, can solve problems such as complicated operation and inability to realize on-site, and achieve good selectivity

Inactive Publication Date: 2011-09-07
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have relatively high sensitivity, but the operation is complicated and must be completed in the laboratory, which cannot be realized on site.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Co-dissolve chromium acetate and aluminum nitrate in an appropriate amount of deionized water, wherein the atomic ratio of Cr and Al is about 1:1, add citric acid under high-speed stirring, and adjust the pH value to 3.0 with concentrated ammonia water, and continue stirring After standing for 6 hours, the solution was evaporated at 78°C to obtain a gel, and the gel was dried by infrared for 1 hour. After being fully ground, the temperature was raised to 520°C at a rate of no more than 5°C per minute in a box-type resistance furnace. , keep this temperature for 2 hours to get Cr 2 o 3 and Al 2 o 3 Nano powder;

[0020] (2) Dissolve palladium chloride in 18% hydrochloric acid aqueous solution, and under constant stirring, add the above-mentioned nanopowder dispersed through ultrasonic wave, wherein the atomic ratio of Pd and Cr is about 1:100, continue to stir and add dropwise 35% hydrazine hydrate aqueous solution, mixed evenly, directly placed in a drying oven ...

Embodiment 2

[0024] (1) Co-dissolve chromium nitrate and aluminum sulfate in an appropriate amount of deionized water, wherein the atomic ratio of Cr and Al is about 1:1, add citric acid under high-speed stirring, and adjust the pH value to 3.5 with concentrated ammonia water, and continue stirring After standing for 5 hours, the solution was evaporated at 80°C to obtain a gel, and the gel was dried by infrared for 1.5 hours. After being fully ground, the temperature was raised to 550°C at a rate of no more than 5°C per minute in a box-type resistance furnace. , keep this temperature for 2.5 hours to get Cr 2 o 3 and Al 2 o 3 Nano powder;

[0025] (2) Dissolve palladium chloride in 18% hydrochloric acid aqueous solution, and under constant stirring, add the above-mentioned nanopowder dispersed through ultrasonic wave, wherein the atomic ratio of Pd and Cr is about 1:100, continue to stir and add dropwise 35% hydrazine hydrate aqueous solution, mixed evenly, directly placed in a drying ...

Embodiment 3

[0029] (1) Co-dissolve chromium chloride and aluminum acetate in an appropriate amount of deionized water, wherein the atomic ratio of Cr and Al is about 1:1, add citric acid under high-speed stirring, and adjust the pH value to 2.8 with concentrated ammonia water, continue Stir for 7 hours, let it stand for aging, rotate the solution at 85°C to obtain a gel, dry the gel by infrared for 2 hours, grind it thoroughly, and raise the temperature to 580°C at a speed of no more than 5°C per minute in a box-type resistance furnace ℃, keep this temperature for 2 hours, get Cr 2 o 3 and Al 2 o 3 Nano powder;

[0030] (2) Dissolve palladium chloride in 18% hydrochloric acid aqueous solution, and under constant stirring, add the above-mentioned nanopowder dispersed through ultrasonic wave, wherein the atomic ratio of Pd and Cr is about 1:100, continue to stir and add dropwise 35% hydrazine hydrate aqueous solution, mixed evenly, directly placed in a drying oven to dry, that is, Cr do...

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Abstract

The invention relates to a nano-sensitive material for monitoring sulfur dioxide, which is characterized in that chromatic salt and aluminum salt are used as initial materials, and Cr2O3 and Al2O3 nano-powders doped with Pd atoms are prepared after the processes of dissolving, aging, evaporating, drying, grinding, roasting, doping, baking and the like, wherein the content ranges of all the components are as follows: 1-2% of Pd, 40-45% of Cr2O3 and 53-59% of Al2O3, and the particle sizes of all the components are less than 30nm. A sulfur dioxide sensor prepared from the sensitive material disclosed by the invention has the advantages of wider linear range, better selectivity, higher sensitivity and long service life of over 150 h; and micro sulfur dioxide in air can be detected on line without the influence from coexist substances.

Description

technical field [0001] The invention relates to a sensitive material for monitoring sulfur dioxide in the air, especially Cr doped by Pd atoms 2 o 3 and Al 2 o 3 Sensitive material composed of nano powder. It belongs to the field of sensor technology. Background technique [0002] Sulfur dioxide is one of the main pollutants in the atmosphere and an important symbol to measure whether the atmosphere is polluted. Serious incidents of sulfur dioxide hazards have occurred in many cities in the world, causing many people to be poisoned or killed. Sulfur dioxide is acidic and can react with other substances in the air to produce tiny sulfite and sulfate particles. When these particles are inhaled, they accumulate in the lungs and are one of the leading causes of respiratory symptoms and disease. Frostbite may occur if mixed with water and then in contact with skin. In contact with eyes, it may cause redness and pain. [0003] After sulfur dioxide enters the respiratory t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 周考文谷春秀王宇
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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