Cataluminescence sensitive material for formaldehyde, benzene and ammonia in air

A technology of sensitive materials and formaldehyde, applied in the field of sensing, can solve the problems of measurement interference of benzene series, measurement interference, and the selectivity of sensitive materials needs to be improved.

Inactive Publication Date: 2015-01-21
BEIJING UNION UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods require pre-enrichment and proper treatment to complete the determination through analytical instruments, so it takes a long time and is not easy to implement on site
[0007] In 2008, the inventor used nano-scale molybdenum-vanadium-titanium (atomic ratio 2:3:5) composite oxidation in a paper entitled "Nanocomposite Oxide Catalytic Luminescence Method for Determination of Formaldehyde in Air" published in "Acta Chemica Sinica" 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, methanol, ammonia, sulfur dioxide and acetone have some interference on the determination of formaldehyde; in 2006, the inventor published a paper entitled "Determination of Benzene Series in the Air by Nanocomposite Catalytic Luminescence Method" in "Analytical Laboratory" In his paper, nano-scale copper-ma

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Under continuous stirring, slowly add natural graphite to concentrated sulfuric acid at a temperature of 5°C. After stirring for 2 hours at a constant temperature, slowly add ammonium nitrate equal to the weight of natural graphite. Continue stirring and slowly increase the temperature to 36°C. Add 3 times the weight of natural graphite. Potassium permanganate, stir at constant temperature for 1.8 hours, add appropriate amount of deionized water, continue to stir and slowly heat up to 77°C, stir at constant temperature for 1 hour, after cooling to room temperature, add dropwise 16% hydrogen peroxide aqueous solution until there are no bubbles , Suction filtration and washing the filtrate with water to neutral to obtain graphene oxide; under continuous stirring, dissolve tungstic acid, bismuth acetate, zirconium oxychloride octahydrate and tin chloride pentahydrate in hydrochloric acid with a mass fraction of 10% In the aqueous solution, ultrasonically oscillate until it i...

Embodiment 2

[0018] Under continuous stirring, slowly add natural graphite to concentrated sulfuric acid at a temperature of 6°C. After stirring at a constant temperature for 3 hours, slowly add ammonium nitrate equal to the weight of natural graphite. Continue stirring and slowly increase the temperature to 38°C. Add 4 times the weight of natural graphite. Potassium permanganate, stir at constant temperature for 1.5 hours, add appropriate amount of deionized water, continue to stir and slowly heat up to 79°C, stir at constant temperature for 1 hour, after cooling to room temperature, add dropwise 18% hydrogen peroxide aqueous solution until there are no bubbles , Suction filtration and washing the filtrate with water to neutral to obtain graphene oxide; Under continuous stirring, ammonium tungstate, bismuth oxalate heptahydrate, zirconium acetate, zirconium sulfate and stannous chloride dihydrate are dissolved in mass fraction of In a 10% hydrochloric acid aqueous solution, ultrasonically o...

Embodiment 3

[0022] Under continuous stirring, slowly add natural graphite to concentrated sulfuric acid at a temperature of 7°C. After stirring at a constant temperature for 2.5 hours, slowly add ammonium nitrate equal to the weight of natural graphite. Continue stirring and slowly increase the temperature to 40°C. Add 5 times the weight of natural graphite. Potassium permanganate, stir at constant temperature for 1.7 hours, add appropriate amount of deionized water, continue to stir and slowly warm up to 85°C, stir at constant temperature for 1 hour, after cooling to room temperature, add dropwise a 20% mass fraction of hydrogen peroxide aqueous solution until no bubbles , Suction filtration and washing the filtrate with water to neutral to obtain graphene oxide; under continuous stirring, ammonium paratungstate, bismuth nitrate pentahydrate, bismuth sulfate, zirconium sulfate tetrahydrate and stannous nitrate are dissolved in 10% mass fraction In the hydrochloric acid aqueous solution, ul...

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PUM

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Abstract

The invention relates to a cataluminescence sensitive material for formaldehyde, benzene and ammonia in air. The cataluminescence sensitive material is characterized by consisting of WO3, Bi2O3, ZrO2 and SnO2 loaded by grapheme in composite. The preparation method for the cataluminescence sensitive material comprises the steps as follows: firstly, natural graphite is used for preparing oxidized grapheme; secondly, the oxidized grapheme is added into a hydrochloric acid solution of tungsten salt, bismuth salt, zirconium salt and stannum salt so as to be subjected to ultrasonic vibration until the solution is clarified; fourthly, hydrazine hydrate water solution is put in additionally, and ammonia water is put in by drops until the pH value of the solution reaches 6.5-7.2; fifthly, after the solution is subjected to aging, filtering, drying, grinding and burning, the composite sensitive material consisting of the WO3, Bi2O3, ZrO2 and SnO2 loaded by the grapheme is obtained through natural cooling. Through utilizing a gas sensor made from the composite sensitive material provided by the invention, trace amount of formaldehyde, benzene and ammonia in air is detected quickly and accurately without the interference of other common coexisting materials.

Description

Technical field [0001] The invention relates to a catalytic luminescence sensitive material for formaldehyde, benzene and ammonia in the air, in particular to graphene-supported WO 3 , Bi 2 O 3 , ZrO 2 And SnO 2 The composite sensitive material composed belongs to the field of sensing technology. Background technique [0002] Formaldehyde is a colorless and volatile chemical raw material. As an adhesive raw material, disinfectant, preservative and finishing agent, it is widely used in products such as compressed board, coatings, paints, cosmetics and packaging materials, and with the use of applied products Is constantly released into the air. People have different reactions to various concentrations of formaldehyde in the air: when the concentration of formaldehyde in the air reaches 0.08mg / m 3 When children will have mild asthma, reaching 0.1mg / m 3 Sometimes there is a peculiar smell, reaching 0.6mg / m 3 Sometimes it can cause throat discomfort or pain, reaching 1mg / m 3 It will ...

Claims

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Application Information

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IPC IPC(8): G01N31/10G01N21/76
Inventor 周考文李姗杨鹏越
Owner BEIJING UNION UNIVERSITY
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