A method for detecting polycyclic aromatic hydrocarbons in liquid phase
A polycyclic aromatic hydrocarbon and liquid phase technology, which is applied in the field of environmental chemical monitoring, can solve the problems of Raman spectrum sensitivity not meeting the detection requirements, low polycyclic aromatic hydrocarbon molecular content, complex substrate preparation process, etc., and achieve Raman signal enhancement ability, high sensitivity, and the effect of improving detection sensitivity
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Embodiment 1
[0029] In this embodiment, the sample is a concentration of 10 -7 For the aqueous solution of pyrene of M, sample A and sample A are used to detect polycyclic aromatic hydrocarbons in the sample. Sample A is a metal-organic framework material MIL-101, and reagent B is a spherical Ag nanoparticle sol.
[0030] Sample A can be prepared by the following method:
[0031] 2.7g Cr(N0 3 ).9H 2 0, l.lg terephthalic acid, and 100mL HF were mixed in 30ml distilled water, and reacted at 220°C for 8 hours; after the reaction was complete, the reaction product was washed with water and ethanol under reflux at 70°C, and the washed product was baked at 150°C Dry to obtain sample A powder, its specific surface area is 2023m 2 / g, the pore size is 2.9nm and 3.4nm.
[0032] Reagent B can be prepared as follows:
[0033] 20mL concentration is 10 -2 M silver nitrate solution, 20mL trisodium citrate solution with a mass percentage of 1% and 80mL deionized water were mixed evenly, and 100mL ...
Embodiment 2
[0038] In this embodiment, the sample is a concentration of 10 -7 For the aqueous perylene solution of M, sample A and sample A are used to detect polycyclic aromatic hydrocarbons in the sample. Sample A is metal-organic framework material UIO-66, and reagent B is polyhedral Au nanoparticle sol.
[0039] Sample A can be prepared by the following method:
[0040] ZrCl 4 1.40g, 0.96g of terephthalic acid, 7.32g of benzoic acid, and 1.0mL of HCl with a concentration of 37% were ultrasonically dissolved in 108mL of DMF, and the mixed solution was transferred to a glass bottle, heated at 120°C for 48 hours, and then centrifuged in DMF Washing; soak the washed product in acetone for 24 hours to replace DMF, then centrifuge, and then vacuum dry at 80°C to obtain sample A powder with a specific surface area of m 2 / g, the pore diameter is about 4.1nm.
[0041] Reagent B can be prepared as follows:
[0042] Heat 37.5mL of ascorbic acid aqueous solution to 60°C, add 0.03mL of a m...
Embodiment 3
[0047] In this embodiment, the sample is a concentration of 10 -4 Anthracene methanol solution of M, using sample A and sample A to detect polycyclic aromatic hydrocarbons in the sample. Sample A is a metal-organic framework material ZIF-8, and reagent B is a spherical Ag nanoparticle sol.
[0048] Sample A can be prepared by the following method:
[0049] 2.58g Zn(NO 3 ) 2 Dissolve in 200mL of methanol to obtain solution A; dissolve 2.63g of 2-methylimidazole in 200mL of methanol to obtain solution B. Solution A and solution B were mixed, stirred for 15 minutes, and then aged at room temperature for 24 hours. The obtained white precipitate was centrifuged, washed with methanol and dried at 100°C to obtain sample A powder with a specific surface area of 1430m 2 / g, the pore diameter is about 0.34nm. Weigh 100 mg of the sample A powder ZIF-8, sandwich it between two clean glass slides, and press it into a sample A thin slice.
[0050] The preparation method of reagent B...
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