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Tin-doped photocatalytic formaldehyde sensing material and its preparation method and formaldehyde sensor

A sensing material and photocatalytic technology, applied in the direction of material resistance, etc., can solve the problems of unsatisfactory material selectivity and inability to distinguish ethanol well, and achieve the improvement of detection limit, selectivity and low cost. Effect

Inactive Publication Date: 2019-06-21
PEKING UNIV +1
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  • Summary
  • 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 photocatalytic formaldehyde sensing material and its preparation method 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] 10.77g ZnSO 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 deionized water, and add 0.009g 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 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.

[0055] c) S...

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Abstract

A stannum-doped photocatalysized formaldehyde sensing material and a preparation method thereof, and a formaldehyde sensor. The photocatalysized formaldehyde sensing material contains zinc oxide nanoparticles and a tin additive. The material is prepared by first dispersing pre-synthesized zinc oxide nanoparticles uniformly in a tin salt solution to obtain a solution A; then, stirring the solution A and evaporating the solvent to obtain a sediment B; and then calcining the sediment B at a high temperature to obtain a product C, i.e. a photocatalysized formaldehyde sensing material. By said method, a low-cost, high-sensitivity and high-selectivity photocatalysized formaldehyde sensing material is prepared, which can reduce the lower limit of detected formaldehyde to 0.1 ppm and improves the selectivity of the material to ethanol.

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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Patent Type & Authority Patents(China)
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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