Cataluminescence sensitive material for formaldehyde, benzene and ammonia in air

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 ...

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-manganese-ferro (atomic ratio 4:3:1) composite oxide is used as a sensitive material, which can detect 1-80 mg / m2 on-line 3 Benzene series, the detection limit can reach 0.5mg / m 3 , but formaldehyde, methanol, ethanol and acetone have certain interference on the determination of benzene series; invention patent 200910223546.2 discloses a nano-sensitive material for monitoring benzene series, and the sensor prepared by using this material can monitor trace amounts of benzene in the air, However, formaldehyde, methanol, hydrogen sulfide and acetic acid also have response signals; invention patent 200710306935.2 discloses a nanocomposite oxide sensitive material for ammonia, and the ammonia sensor prepared by using this material also has response signals to formaldehyde, methanol and ethanol; these Both indicate that the selectivity of sensitive materials needs to be improved