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Tin-doped photocatalysis formaldehyde sensing material, preparation method thereof and formaldehyde sensor

A sensing material, photocatalytic technology, applied in the direction of material resistance, etc., can solve the problems of not being able to distinguish ethanol well, material selectivity is not satisfactory, etc., and achieve improved detection limit, high selectivity, and low cost Effect

Inactive Publication Date: 2015-11-25
PEKING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the working temperature of the sensor is 260-300°C. At this temperature, almost all indoor organic pollutants can be oxidized on the surface of the sensing material, so the selectivity of the material is not satisfactory, especially it cannot be well distinguished ethanol and formaldehyde

Method used

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  • Tin-doped photocatalysis formaldehyde sensing material, preparation method thereof and formaldehyde sensor
  • Tin-doped photocatalysis formaldehyde sensing material, preparation method thereof and formaldehyde sensor
  • Tin-doped photocatalysis formaldehyde sensing material, preparation method thereof and formaldehyde sensor

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preparation example Construction

[0033] figure 1 It is a flow chart of the steps of the synthesis method of the photocatalytic formaldehyde sensing material of the present invention, comprising the following steps:

[0034] 1) Disperse pre-synthesized ZnO nanoparticles into a tin salt solution (such as SnSO 4 + deionized water);

[0035] 2) Evaporate the solution to dryness, preferably at 80-120°C, more preferably stir at 80°C until the solvent evaporates, then dry at 80°C for 12 hours and at 120°C for 2 hours to make the sample dry thoroughly;

[0036] 3) Calcining the obtained precipitate for a certain period of time at 400-500°C (the optimum calcination temperature is 450°C), and the original tin salt will generate tin oxide after calcination;

[0037] 4) Grinding the obtained solid product into powder and dispersing in ethanol solution to form a slurry.

[0038] Then, the obtained slurry is suspended-coated on the interdigitated electrode, and the solvent is dried to obtain the formaldehyde sensor we ...

Embodiment 1

[0040] Embodiment 1: Synthesis and testing of materials

[0041] Step 1: Synthesis of ZnO nanoparticles

[0042] 10.77gZnSO 4 ·7H 2 O (375 mmol) was dissolved in 25 mL deionized water. The solution was added dropwise to 50mL100g / L (1.36mmol / L) NH 4 HCO 3 The solution was stirred for 1 h in a water bath at 40°C. The supernatant was removed, and the precipitate was washed three times with 15 mL of deionized water each time, and then the precipitate was dried at 80 °C for 12 h and at 120 °C for 2 h. After baking, the samples were calcined in a muffle furnace at 500 °C for 2 h.

[0043] Step 2: Addition of tin element

[0044] Weigh 0.4 g of pre-prepared ZnO nanoparticles and disperse them in 60 mL of tin salt solution (SnSO 4 0.007g), the solution was stirred at 80°C and the solvent was evaporated to dryness, then the precipitate was dried at 80°C for 12h and at 120°C for 2h. After this the precipitate was calcined at 450°C.

[0045] Step 3: Sensor Preparation

[0046]...

Embodiment 2

[0050] Embodiment 2: the introduction of different tin sources ( figure 2 )

[0051] a) SnCl 4 ·5H 2 o

[0052] Weigh 0.400g of synthesized ZnO particles and dissolve in 110ml of deionized water, and add 0.009g of SnCl to it 4 ·5H 2 O, then sonicate the solution for 5 minutes, stir and heat with a magnetic stirrer until the solvent is evaporated, put the obtained solid in an oven at 80°C for 8 hours, then adjust the temperature of the oven to 120°C for 2 hours, and then place it at 450 ℃ for 4 hours in a muffle furnace.

[0053] b) SnC 2 o 4

[0054] Weigh 0.400g of synthesized ZnO particles and dissolve them in 110ml of deionized water, and add 0.0056g of SnC 2 o 4 , then sonicate the solution for 5 minutes, stir and heat with a magnetic stirrer until the solvent is evaporated, put the obtained solid in an oven at 80°C for 8 hours, then adjust the temperature of the oven to 120°C for 2 hours, and then place it at 450°C Calcined in a muffle furnace for 4 hours.

...

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Abstract

The invention relates to a tin-doped photocatalysis formaldehyde sensing material, a preparation method thereof and a formaldehyde sensor. The tin-doped photocatalysis formaldehyde sensing material comprises zinc oxide nanoparticles and a tin additive. When the material is prepared, the zinc oxide nanoparticles synthesized in advance are evenly scattered in a tin salt solution, and a solution A is obtained; the solution A is stirred to dry the solvent through evaporation, and a precipitate B is obtained; then high-temperature calcination is carried out on the precipitate B to obtain a product C namely, the photocatalysis formaldehyde sensing material. Preferably, the tin salt is stannous mono-sulphate. The tin-doped photocatalysis formaldehyde sensing material is low in cost, high in sensitivity and high in selectivity. The lower limit of detection of formaldehyde is lowered to 0.1 ppm. The selectivity of the material for ethyl alcohol is improved.

Description

technical field [0001] The invention belongs to the field of formaldehyde gas monitoring technology and formaldehyde sensor technology, and in particular relates to a tin-doped photocatalytic formaldehyde sensing material, a preparation method thereof and a formaldehyde sensor. Background technique [0002] Long-term exposure to formaldehyde gas exceeding the safe concentration limit is very harmful to human health, which may cause burning sensation in the eyes and throat, difficulty in breathing, and even fatal diseases such as nasal cancer, myelogenous leukemia, etc. At present, formaldehyde pollution is still very serious in China. Nearly 70% of newly renovated houses are plagued by formaldehyde pollution. Therefore, the most worrying indoor pollutant gas in China is formaldehyde. [0003] For air quality products, sensor technology is very important, because if consumers are not sure about the true role of air quality products, then they will have doubts about related pr...

Claims

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Application Information

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IPC IPC(8): G01N27/04
CPCG01N27/04G01N27/12
Inventor 常兴华刘宇郑捷李星国
Owner PEKING UNIV
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