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
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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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