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Composite oxide sensitive material used for monitoring formaldehyde and ammonia simultaneously

A composite oxide and sensitive material technology, applied in the field of composite oxide sensitive materials, can solve problems such as insufficient stability and sensitivity, measurement interference, and impossibility of on-site implementation

Inactive Publication Date: 2014-08-06
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 they all need pre-enrichment and proper treatment to complete the determination through analytical instruments, which must be completed in the laboratory and cannot be realized on site
The on-site determination methods for formaldehyde and ammonia mainly include the detection tube colorimetric method, which has insufficient stability and sensitivity and can only be used as a semi-quantitative method
[0006] In 2008, the inventor published a paper entitled "Determination of Formaldehyde in Air by Catalytic Luminescence Method of Nanocomposite Oxide" published on "Acta Chemical Sinica" using nano-scale molybdenum-vanadium-titanium (atomic ratio: 2:3:5) composite oxide As a sensitive material, it can detect 0.07~34mg / m online 3 formaldehyde, the detection limit can reach 0.04mg / m 3 , but benzene, sulfur dioxide and acetone have some interference to the determination of formaldehyde; in 2011, the inventor published a paper entitled "A NovelAmmonia Sensor Utilizing Cataluminescence on Nano-TiW" on "Materials Science Forum" 3 Cr 2 o 14 "In the paper, nano-scale titanium-tungsten-chromium (atomic ratio 1:3:2) composite oxide is used as a sensitive material, which can detect 1-50 mg / m2 on-line. 3 Ammonia, the detection limit can reach 0.5mg / m 3 , but ethanol and acetone have some interference on the determination of ammonia, indicating that the selectivity of sensitive materials needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Co-dissolve lanthanum nitrate hexahydrate, titanium sulfate nonahydrate and tin chloride pentahydrate in isocitric acid aqueous solution with a mass fraction of 12%, add appropriate amount of concentrated nitric acid and chloroauric acid, stir and reflux in an oil bath at 108°C for 3 hours , remove the reflux tube, heat and volatilize at 110°C for 6 hours to obtain a viscous mixture, place the viscous material in a drying oven at 130°C for 5 hours, and use a box-type resistance furnace at a rate of no more than 3 per minute. Heat up to 300°C at a rate of 1°C, maintain this temperature and bake for 4 hours, cool and fully grind, then place it in a box-type resistance furnace again and raise the temperature to 300°C at a speed of no more than 5°C per minute, and maintain this temperature for 5 hours. Au atom-doped La 2 o 3 、TiO 2 and SnO 2 Composed of composite oxide powder materials.

[0013] Analysis: The powder material was tested with a transmission electron micro...

Embodiment 2

[0016] Co-dissolve lanthanum chloride heptahydrate, titanyl sulfate and stannous chloride dihydrate in isocitric acid aqueous solution with a mass fraction of 14%, add appropriate amount of concentrated nitric acid and chloroauric acid, stir and reflux in an oil bath at 105°C for 2 hours, remove the reflux tube, heat and volatilize at 115°C for 5 hours to obtain a viscous mixture, place the viscous in a drying oven at 120°C for 7 hours, and set the temperature in a box-type resistance furnace at a rate of no more than Heat up to 295°C at a speed of 3°C, maintain this temperature for 5 hours, cool and grind fully, then place it in a box-type resistance furnace again, heat up to 295°C at a speed of no more than 5°C per minute, and maintain this temperature for 5 hours. , naturally cooled to get Au atoms doped by La 2 o 3 、TiO 2 and SnO 2 Composed of composite oxide powder materials.

[0017] Analysis: The powder material was tested with a transmission electron microscope, th...

Embodiment 3

[0020] Co-dissolve lanthanum sulfate nonahydrate, titanium trichloride hexahydrate and stannous nitrate in isocitric acid aqueous solution with a mass fraction of 11%, add appropriate amount of concentrated nitric acid and chloroauric acid, stir and reflux in an oil bath at 107°C for 4 hours , remove the reflux tube, heat and volatilize at 120°C for 4 hours to obtain a viscous mixture, place the viscous material in a drying oven at 125°C for 6 hours, and heat it in a box-type resistance furnace at a rate of no more than 3 per minute. Heat up to 310°C at a rate of 1°C, maintain this temperature and bake for 3 hours, cool and fully grind, then place it in a box-type resistance furnace again and raise the temperature to 310°C at a speed of no more than 5°C per minute, maintain this temperature and bake for 5 hours, Au atom-doped La 2 o 3 、TiO 2 and SnO 2 Composed of composite oxide powder materials.

[0021]Analysis: The powder material was tested with a transmission electron...

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Abstract

The invention relates to a composite oxide sensitive material used for monitoring formaldehyde and ammonia simultaneously. The composite oxide sensitive material is Au atom-doped La2O3-TiO2-SnO2 composite oxide nano-powder material which comprises the following components in mass percent: 3-5 percent of Au, 19-30 percent of La2O3, 33-45 percent of TiO2 and 24-31 percent of SnO2. A preparation method comprises the following steps: dissolving lanthanum salt, titanium salt and tin salt in an isocitric acid water solution, adding concentrated nitric acid and chloroauric acid in a defined amount, and performing back flow, volatilization, drying, calcination, grinding and calcination again to obtain the Au atom-doped La2O3-TiO2-SnO2 composite oxide nano-powder material. A formaldehyde-ammonia cataluminescence sensor manufactured by adopting the composite oxide sensitive material provided by the invention has wider linearity range, favorable selectivity and higher sensitivity, and can be used for performing on-line simultaneous monitoring of formaldehyde and ammonia in the air without being influenced by other concomitant substances.

Description

technical field [0001] The present invention relates to a compound oxide sensitive material for simultaneous monitoring of formaldehyde and ammonia, especially La doped by Au atoms 2 o 3 、TiO 2 and SnO 2 The nanocomposite oxide sensitive material composed of the invention belongs to the field of sensing technology. Background technique [0002] Formaldehyde is a colorless and volatile chemical raw material, which is widely used in products such as compressed boards, coatings, paints, cosmetics and packaging materials as adhesive raw materials, disinfectants, preservatives and finishing agents. People have different reactions to various concentrations of formaldehyde in the air. When the concentration of formaldehyde in the air reaches 0.06-0.07mg / m 3 Children will have mild asthma when it reaches 0.1mg / m 3 There will be peculiar smell and discomfort when it reaches 0.5mg / m 3 Sometimes it can irritate the eyes and cause tears, reaching 0.6mg / m 3 Can cause throat discom...

Claims

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Application Information

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IPC IPC(8): G01N21/76C01F17/00C01G23/08C01G19/02B82Y30/00
Inventor 周考文肖宇赵明航
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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