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Detection method for high-precision detection of volatile organic compounds

A technology of organic compounds and detection methods, applied in the fields of alkali metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult volatile organic compound types and concentration judgment, limited practical application, limited response effect, etc., to achieve Excellent adsorption and desorption performance, improved sensitivity, and improved organic affinity

Active Publication Date: 2020-07-14
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited response effect between the nickel oxide film prepared by this method and volatile organic compounds, a small amount of volatile organic compounds may be difficult to cause obvious color changes, resulting in low sensitivity and difficulty in the detection of volatile organic compounds using this method. Accurately judge the type and concentration of trace volatile organic compounds, the detection accuracy is insufficient, and the practical application is limited

Method used

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  • Detection method for high-precision detection of volatile organic compounds
  • Detection method for high-precision detection of volatile organic compounds
  • Detection method for high-precision detection of volatile organic compounds

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0053] This embodiment provides a high-precision detection method for volatile organic compounds, including the following steps:

[0054] S1. Preparation of cerium-doped mesoporous molecular sieve by hydrothermal reaction method: mix 10mL tetraethyl orthosilicate with 50mL deionized water, stir at 35°C for 40min, then add 0.9g sodium hydroxide and 0.19g sodium fluoride in sequence and 0.39g of cerium nitrate, fully stirred for 60min to obtain a mixed solution; 10.61g of hexadecyltrimethylammonium bromide was added to the mixed solution, and after stirring for 60min, the reaction solution was placed in an autoclave and heated at 120°C After heating at low temperature for 24 hours, the product was filtered sequentially, washed with distilled water, dried at 80° C., and then calcined at 550° C. for 4 hours to obtain a cerium-doped mesoporous molecular sieve.

[0055] After converting the used volume or mass of the above-mentioned raw materials into the amount of substances, the e...

Embodiment 2～8

[0073] Embodiments 2 to 8 respectively provide a detection method for detecting volatile organic compounds with high precision. Compared with embodiment 1, the difference is that the relevant parameters in the preparation process of the volatile organic compound detection membrane are changed.

[0074] Among them, in Examples 2-4, only the dosing amount of cerium nitrate in step S1 was changed, and the molar ratios of tetraethylorthosilicate and cerium nitrate in Examples 2-4 were 1:0.005, 1:0.01 and 1:0.04 in sequence. Detect the concentration of methanol in the steam to be tested according to the detection method provided in Examples 2-4, and compare with Example 1, the peak fluorescence intensity of each detection film obtained varies with the molar ratio of tetraethyl orthosilicate and cerium nitrate ,Such as Figure 4 shown.

[0075] Depend on Figure 4 It can be seen that with the increase of cerium nitrate content, the peak fluorescence intensity of the detection memb...

Embodiment 9～11

[0079] Embodiments 9 to 11 respectively provide a detection method for detecting volatile organic compounds with high precision. Compared with embodiment 1, the preparation method of the detection film is the same, the difference is that different types of volatile organic compounds are tested. detection. Among them, in Examples 9-11, formaldehyde, dimethylformamide, and tetrahydrofuran were respectively used as the volatile organic compounds to be detected.

[0080] When the methods provided in Examples 9 to 11 are used to detect formaldehyde, dimethylformamide, and tetrahydrofuran, fluorescence spectra with peaks can be obtained in their respective wavelength ranges for use, and the corresponding peaks of various volatile organic compounds Fluorescence intensity graph as Figure 6 shown.

[0081] Depend on Figure 6 It can be seen that when using the detection method provided by the invention to detect methanol, formaldehyde, dimethylformamide, and tetrahydrofuran, the de...

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Abstract

The invention discloses a detection method for high-precision detection of volatile organic compounds, which comprises the following steps of preparing a cerium-doped mesoporous molecular sieve, sequentially carrying out aminopropyl modification, perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafting and octadecyl mercaptan modification on the cerium-doped mesoporous molecular sieve, and packaging to obtain a volatile organic compound detection film, and establishing a standard curve between the concentration of the volatile organic compounds and the fluorescence intensity of the detectionfilm by utilizing the fluorescence intensity difference of the detection film to the volatile organic compounds with different concentrations, so that the high-precision detection of the volatile organic compounds is realized. In the way, the rich pore structure in the molecular sieve can be used to efficiently adsorb and desorb the volatile organic compound, the perylene-3, 4, 9, 10-tetracarboxylic dianhydride is taken as a substrate, quantitative detection of the volatile organic compounds is realized by utilizing the fluorescence effect of the perylene-3, 4, 9, 10-tetracarboxylic dianhydride, and the sensitivity, accuracy and stability of detection are effectively improved by combining the synergistic effect of all groups, so that the application range is relatively wide.

Description

technical field [0001] The invention relates to the technical field of volatile organic compound detection, in particular to a detection method for high-precision detection of volatile organic compounds. Background technique [0002] With the development of science and technology and industrial technology, gasoline, rubber, pesticides, plastic products and other products bring convenience to human life, but at the same time, the harmful gases produced in the production process are also endangering the environment and human health. Volatile organic compounds, as an important item of the above-mentioned harmful gases, usually refer to various organic compounds with a boiling point of 50-260°C at room temperature, mainly including hydrocarbons, oxygen hydrocarbons, halogen-containing hydrocarbons, nitrogen hydrocarbons, Sulfur hydrocarbons and low-boiling polycyclic aromatic hydrocarbons are a type of organic pollutants that are ubiquitous in the air and have a complex composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64B01J20/18B01J20/28B01J20/30
CPCB01J20/186B01J20/28033G01N21/64
Inventor 张维
Owner HUNAN UNIV OF SCI & TECH
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