Abstract
The content of volatile organic compounds (VOCs) in the atmosphere will endanger the health and safety of human beings which makes it very important to develop a simple and rapid method for the determination of gas pollutants. Based on this, a new type of gas sensor was proposed for the detection of trichloroethylene in air. PEG200/ZnO nanocomposite were prepared by hydrothermal method. The materials were characterized by scanning electron microscope, X-ray energy spectrum and fourier infrared spectrum. The high selectivity of the materials was verified by using the cataluminescence (CTL) intensity of 9 kinds of VOCs on the surface of the materials as a reference. The results show that trichloroethylene can produce CTL response on the surface of PEG200/ZnO nanocomposite. Temperature, air flow rate and detector concentration all have certain effects on the CTL intensity. By comparing the CTL intensity under different reaction conditions, it is found that the suitable temperature and air flow rate are 120 °C, 180 mL/min and there is a good linear relationship between the relative CTL intensity and the concentration of the detected substance (y = 28.588 x - 285.56, R=0.9593). The gas sensor has the advantage of rapid response, and trichloroethylene can produce the maximum CTL on the surface of the material within 3 ~ 5 s.
Highlights
With the development of coal chemical industry, petrochemical industry and solvent manufacturing industry, as well as the increase of industrial exhaust gas and automobile exhaust gas, the content of volatile organic compounds (VOCs) in air is increasing year by year[1,2]
As an important precursor of haze and photochemical smoke, VOCs has become the main culprit of air pollution
After the reaction conditions were stable, a certain amount of VOCs to be detected was injected into the sample inlet by using a microsyringe, and the CTL signal was detected by ultra-weak chemiluminescence analyzer (BPCL-1-TIC)
Summary
With the development of coal chemical industry, petrochemical industry and solvent manufacturing industry, as well as the increase of industrial exhaust gas and automobile exhaust gas, the content of volatile organic compounds (VOCs) in air is increasing year by year[1,2]. In combination with the advantages of the rapid detection method based on the CTL, it is necessary to study a method to quickly detect the trichloroethylene. Xu et al.[16] found that PEG200 can be used to improve the CTL properties of materials. Nanometer ZnO modified materials were used as sensing elements to design and construct CTL - based sensors for rapid detection of VOCs in this paper. After filtered, washed and dryed at 70 oC for 24 h, the obtained product was calcined at 550 oC for 3 h as resulting materials
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