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CN-116698800-B - Application of covalent organic framework material in detection of explosive molecules

CN116698800BCN 116698800 BCN116698800 BCN 116698800BCN-116698800-B

Abstract

The invention discloses an application of a covalent organic framework material in explosive molecule detection, in the application, the covalent organic framework material COFs based on aggregation-induced emission effect is synthesized, which is called JUC-646, TNP is used as a model molecule for research, and effective detection of fluorescent molecules on explosives is explored. Meanwhile, the invention uses o-dinitrobenzene, m-dinitrobenzene and p-dinitrobenzene as comparison samples, and verifies the specific recognition of JUC-646 on TNP molecules.

Inventors

  • SONG JIALONG
  • Tuo chao
  • FU JING

Assignees

  • 珠海科技学院

Dates

Publication Date
20260505
Application Date
20230516

Claims (6)

  1. 1. Use of a covalent organic framework material in the detection of an explosive molecule, the explosive molecule being 2,4, 6-trinitrophenol, the covalent organic framework material having specific recognition for 2,4, 6-trinitrophenol, the covalent organic framework material being prepared by a preparation method comprising the steps of: S1, weighing TPTPE in 0.02-0.05 part by weight and BMTA in 0.02-0.05 part by weight, adding into a mortar, fully grinding until powder is uniformly mixed, then filling into a pipe, and then adding 0.4-0.6 part by volume of mesitylene, 0.4-0.6 part by volume of 1, 4-dioxane and 0.1-0.2 part by volume of acetic acid, wherein the parts by weight are expressed as volume = g: mL; S2, rapidly freezing the tube in a liquid nitrogen bath, vacuumizing until the pressure in the tube reaches 13-17 mmHg, sealing by flame, and then heating in an oven; s3, separating the product by centrifugation, during which time acetone is used for exchanging solvent, washing the precipitate to remove guest molecules in the pore canal, and placing the product in a vacuum drying oven for vacuum drying to obtain yellow powdery product; wherein the covalent organic framework material has a molecular structural formula: , BMTA has the molecular structural formula: , TPTPE has the molecular structural formula: 。
  2. 2. The use according to claim 1, wherein in S1, 0.037 gTPTPE and 0.031 gBMTA are weighed into a mortar and ground thoroughly, after which 0.5. 0.5 mL mesitylene, 0.5 mL 1, 4-dioxane and 0.1 mL 6m acetic acid are added.
  3. 3. The use according to claim 2, wherein in S1, the tube is subsequently inserted into a tube having an inner diameter of 8±0.5 mm Pyrex.
  4. 4. Use according to claim 1, characterized in that in S2, it is heated in an oven at 120 ℃ for 120 hours.
  5. 5. Use according to claim 1, characterized in that in S3, the solvent is exchanged 3 times with 35 mL fresh acetone.
  6. 6. Use according to claim 1, characterized in that in S3 the product is dried in vacuum in a vacuum oven at 120 ℃ for 12 hours.

Description

Application of covalent organic framework material in detection of explosive molecules Technical Field The invention relates to the field of application of organic materials, in particular to application of a covalent organic framework material in detection of explosive molecules. Background Rapid detection of explosives is an important component of public safety and is also an important research topic in forensics. 2,4, 6-Trinitrophenol (TNP), commonly known as Picric Acid (PA), is one of the common explosives. TNP has been used historically on a large scale because of its greater explosive power than 2,4, 6-trinitrotoluene (TNT) and 2, 4-Dinitrotoluene (DNT). TNP is highly toxic to organisms, can irritate eyes and skin, cause liver dysfunction, harm urinary system, respiratory system and gastrointestinal system, and even cause anemia and cancer. TNP has strong acidity, is soluble in water, and has electron-deficient properties, which make it difficult to degrade in biological systems and environments. TNP is widely used in the fields of firework and match manufacture, dye industry and pharmacy, and has now become a major component of environmental pollutants during production, transportation, use and storage as industrial leakage and waste accumulation in soil and natural water. Therefore, it is very necessary to develop a detection method having specific recognition for TNP. Disclosure of Invention In view of the above, the present invention is directed to an application of a covalent organic framework material in detecting an explosive molecule. The adopted technical scheme is as follows: use of a covalent organic framework material in the detection of explosives molecules. Further, the covalent organic framework material is prepared by a preparation method comprising the following steps: s1, weighing TPTPE and BMTA, adding into a mortar, fully grinding until powder is uniformly mixed, then filling into a tube, and then adding mesitylene, 1, 4-dioxane and acetic acid; S2, rapidly freezing the tube in a liquid nitrogen bath, vacuumizing until the pressure in the tube reaches 13-17mmHg, sealing by flame, and then heating in an oven; s3, separating the product by centrifugation, during which time acetone is used for exchanging the solvent, washing the precipitate to remove guest molecules in the pore canal, and placing the product in a vacuum drying oven for vacuum drying to obtain yellow powdery product. Further, in S1, TPTPE of 0.02 to 0.05 parts by weight and BMTA of 0.02 to 0.05 parts by weight are weighed and added into a mortar for full grinding, and then 0.4 to 0.6 parts by volume of mesitylene, 0.4 to 0.6 parts by volume of 1, 4-dioxane and 0.1 to 0.2 parts by volume of 6M acetic acid are added, wherein the parts by weight are expressed as volume = g: mL. Further, in S1, 0.037gTPTPE and 0.031gBMTA were weighed into a mortar and sufficiently ground, followed by the addition of 0.5mL of mesitylene, 0.5mL of 1, 4-dioxane and 0.1mL of 6M acetic acid. Further, in S1, the tube is then filled into a Pyrex tube having an inner diameter of 8.+ -. 0.5 mm. Further, in S2, the mixture was heated in an oven at 120 ℃ for 120 hours. Further, in S3, the solvent was exchanged 3 times with 35mL of fresh acetone. Further, in S3, the product was vacuum dried in a vacuum oven at 120 ℃ for 12 hours. Further, the explosive molecule is 2,4, 6-trinitrophenol. Further, the explosive molecule is o-dinitrobenzene, m-dinitrobenzene or p-dinitrobenzene. The invention has the beneficial effects that: In the application of the covalent organic framework material in the detection of the explosive molecules, the invention synthesizes the covalent organic framework material COFs based on aggregation-induced emission effect, which is called JUC-646, and explores the effective detection of fluorescent molecules on the explosive by taking TNP as a model molecule for research. Meanwhile, the invention uses o-dinitrobenzene, m-dinitrobenzene and p-dinitrobenzene as comparison samples, and verifies the specific recognition of JUC-646 on TNP molecules. Drawings FIG. 1 is a schematic diagram of the structure for producing JUC-646. FIG. 2 is a graph comparing a) the double penetration PXRD of JUC-646 with b) the non-penetration PXRD of JUC-646. FIG. 3 is a graph of a double pass through and non pass through comparison PXRD of JUC-646. FIG. 4 is an ultraviolet-visible (UV-VIS) absorption spectrum of JUC-646. FIG. 5 is a graph of the solid state fluorescence emission spectrum of JUC-646. FIG. 6 shows a) fluorescence emission spectra of JUC-646 (c=60. Mu.g mL-1) and b) Stern-after titration with a methanol solution of dinitrobenzene (0.001M)A drawing. FIG. 7 shows a) fluorescence emission spectrum and b) Stern-646 (c=60. Mu.g mL-1) of JUC-646 (c=60. Mu.g mL-1) after titration with M-dinitrobenzene (0.001M) in methanolA drawing. FIG. 8 shows a) the fluorescence emission spectrum of JUC-646 (c=60. Mu.g mL-1) and b) Stern-A drawing. FIG. 9 shows a