Application of trace-Pt modified porous ZnO composite material in detection of benzene hydrocarbon gases

A composite material and gas detection technology, applied in the field of gas sensing, can solve the problems of high precious metal content, unfavorable production cost, complicated preparation process, etc., and achieve the effect of less dosage and less cost impact

Inactive Publication Date: 2017-01-11
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
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Problems solved by technology

[0005] In recent years, researchers have found that loading and modifying noble metals in metal oxides can effectively improve the sensitivity of materials to benzene gases, such as Wang et al. (Phys.Chem.Chem.Phys, 2013, Vol. The sensitivity of the material to benzene gases is optimized by loading a certain amount of Au on the ZnO nanowires. However, the content of noble metals used in these solutions is relatively high, which is not conducive to reducing production costs, and the working temperature is high and the preparation process is complicated.

Method used

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  • Application of trace-Pt modified porous ZnO composite material in detection of benzene hydrocarbon gases
  • Application of trace-Pt modified porous ZnO composite material in detection of benzene hydrocarbon gases
  • Application of trace-Pt modified porous ZnO composite material in detection of benzene hydrocarbon gases

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Preparation of Pt-modified ZnO precursor: 0.30 g of zinc acetate dihydrate and 0.30 mg of chloroplatinic acid hexahydrate were dissolved in a mixed solvent consisting of 13 mL of glycerol and 40 mL of isopropanol, and then transferred to a reaction kettle React at 160°C for 2 hours, then cool naturally to room temperature, and centrifuge with ethanol to obtain the Pt-modified ZnO precursor;

[0021] 2) Preparation of Pt-modified porous ZnO composite material: the above-mentioned precursor powder was placed in a muffle furnace and calcined at 400° C. for 2 hours in an air atmosphere to obtain the Pt-modified porous ZnO microsphere composite material ( Such as figure 1 ). The composition and structure of the above samples were analyzed, figure 2 It is the XRD spectrum of Pt-modified porous ZnO microspheres. It can be observed from the figure that the peak positions of all diffraction peaks match PDF#36-1451. Since the amount of Pt modification in the sample is very ...

Embodiment 2

[0025] The same as in Example 1, except that the amount of chloroplatinic acid hexahydrate was changed to 0.60 mg. The response value of the composite material to 100ppm benzene is 35, the response time is 4s, the recovery time is 200s, and the detection limit of benzene is 500ppb.

Embodiment 3

[0027] Same as Example 1, except that the consumption of chloroplatinic acid hexahydrate was changed to 0.45 mg. The response value of the composite material to 100ppm benzene is 48, the response time is 4s, the recovery time is 250s, and the detection limit of benzene is 500ppb.

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Abstract

The invention discloses a trace-Pt modified porous ZnO composite material capable of detecting a trace of benzene hydrocarbon gases in real time quickly and belongs to the technical field of gas sensing. With limit of detection below a safe range and operating temperature clearly lower than that of the conventional gas-sensing material, the gas-sensing composite material has ultra-high sensitivity to benzene hydrocarbon gases, is conductive to prolonging service life of gas-sensing elements and improving reliability of detection signals, and accords with environmental-protection and energy-conservation index. Particularly, the trace-Pt modified porous ZnO composite material is applied to manufacturing of a sensing device for benzene hydrocarbon gases. After the sensing device is subjected to aging treatment for 24 hours at the temperature of 200 DEG C, response values of the sensing device to benzene, methylbenzene and dimethylbenzene within the range of 100 ppm reach 70, 84 and 88 respectively, and quick response and recovery is achieved with response time respectively reaching 3s, 2s and 2s.

Description

technical field [0001] The invention belongs to the technical field of gas sensing, and in particular relates to the application of a Pt-modified porous ZnO composite material in rapidly and accurately detecting trace amounts of benzene gases. [0002] technical background [0003] As a typical volatile organic pollutant, benzene gas is the most common indoor pollutant gas. It is widely used as a solvent, building materials, household products, and raw materials for industrial production, so it is commonly found in residential areas and industrial environments. The high toxicity and carcinogenicity of benzene-based gases will cause serious harm to people even in low-concentration atmospheres. Therefore, the study of benzene-based gas-sensitive materials is an important branch in the field of gas sensing. [0004] Based on the advantages of convenient real-time monitoring, simple operation, and low cost, metal oxide gas sensors have become an effective technical means for det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/0047
Inventor 张娟利赵永男赵金祥李国栋余建国
Owner TIANJIN POLYTECHNIC UNIV
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