CN-122011419-A - MOFs material, preparation method thereof and application thereof to PFOS adsorption and detection

Abstract

The invention discloses a MOFs material, a preparation method thereof and application thereof to PFOS adsorption and detection, and belongs to the technical field of functional materials. The organic ligand of the MOFs material is 2-amino terephthalic acid, and the inorganic metal center is Ce 3+ . The MOFs material has a specific crystal structure, rich amino functional groups, ce 3+ active sites and mesoporous structure characteristics, can realize high-sensitivity detection of PFOS through a fluorescence quenching effect, has a detection limit as low as 16ppb, can remove PFOS efficiently through a chemical adsorption effect, and has a maximum adsorption capacity of 724.6mg/g. The material has the advantages of strong selectivity, good stability, strong applicability and the like, can realize the synchronous detection and pollution repair of PFOS, and has good application prospect in the field monitoring and pollution control of short-chain perfluoro and polyfluoroalkyl substances (PFAS) in the environment.

Inventors

• Che Huachao
• ZHANG YANGYANG
• CUI JINGWEN
• ZHAN JUHONG
• YANG GUI
• WU XIAOYONG
• HUANG BIN
• PAN XUEJUN

Assignees

• 昆明理工大学

Dates

Publication Date

20260512

Application Date

20260313

Claims (6)

1. 1. A MOFs material is characterized in that an organic ligand of the MOFs material is 2-amino terephthalic acid, and an inorganic metal center is Ce 3+ .
2. 2. The method for preparing MOFs material of claim 1 wherein the method comprises the steps of: (1) Sequentially adding 2-amino terephthalic acid and Ce (NO 3 ) 3 ·6H 2 O into N, N-dimethylformamide, and performing ultrasonic treatment to fully dissolve the 2-amino terephthalic acid and the Ce (NO 3 ) 3 ·6H 2 O into the N, N-dimethylformamide to obtain a reaction solution; (2) Carrying out solvothermal reaction on the reaction solution; (3) And (3) sequentially centrifuging and washing the reaction product, soaking in methanol, and drying in vacuum to obtain the MOFs material.
3. 3. The process according to claim 2, wherein in the step (1), the molar ratio of 2-aminoterephthalic acid to Ce (NO 3 ) 3 ·6H 2 O) is 5:1.
4. 4. The method of claim 2, wherein the solvothermal reaction is carried out at a temperature of 110-130℃for a period of 22-26 hours in step (2).
5. 5. The use of the metal-organic framework compound material of claim 1 in visual inspection of perfluorooctanesulfonic acid.
6. 6. Use of the metal-organic framework chemical material of claim 1 for removal of perfluorooctanesulfonic acid contaminants.

Description

MOFs material, preparation method thereof and application thereof to PFOS adsorption and detection Technical Field The invention belongs to the technical field of functional materials, and relates to a MOFs material, a preparation method thereof and application thereof to PFOS adsorption and detection. Background Metal organic framework compounds (MOFs) are crystalline porous materials with periodic network structures formed by self-assembly interconnection of inorganic metal centers (metal ions or metal clusters) and bridged organic ligands. MOFs are organic-inorganic hybrid materials, also called coordination polymers, which are different from inorganic porous materials and common organic complexes, and have the characteristics of rigidity of inorganic materials and flexibility of organic materials, so that the MOFs have great development potential in the aspect of modern material research. Perfluorooctane sulfonate (PFOS) is taken as a typical long-chain perfluoroalkyl acid, is the polyfluoroalkyl substance (PFAS) with the highest content in the environment, has the characteristics of strong mobility, high durability, high potential toxicity and the like, and becomes a ubiquitous environmental pollutant. At present, detection for PFOS mainly depends on technologies such as liquid chromatography-mass spectrometry, gas chromatography-mass spectrometry and the like, and although the methods are high in accuracy, the methods are high in instrument cost and strong in operation specialization, and can only be generally carried out in a laboratory environment, so that on-site rapid screening and timely treatment are difficult to realize. Therefore, the PFOS is economically and rapidly detected and removed, and the method has important significance for environmental pollution control and human health protection. Therefore, it is necessary to provide a metal organic framework compound material, a preparation method and application thereof, and the economic and rapid detection and removal of perfluorooctane sulfonic acid are realized. Disclosure of Invention In order to overcome the problems in the background art, the invention realizes the visual high-sensitivity selective detection of the PFOS by preparing the metal organic framework compound material (Ce-MOF) rich in amino functional groups and Ce 3+ active sites, generating fluorescence and the fluorescence quenching effect of the Ce-MOF through the interaction of the Ce-MOF and the PFOS, and simultaneously realizes the effective removal of the PFOS by carrying out high-capacity adsorption on the PFOS through the selective adsorption. In order to achieve the above purpose, the present invention is realized by the following technical scheme: In one aspect, the invention provides MOFs materials, wherein the organic ligand of the MOFs materials is 2-amino terephthalic acid, and the inorganic metal center is Ce 3+. The invention also provides a preparation method of the MOFs material, which comprises the following steps: (1) Sequentially adding 2-amino terephthalic acid and Ce (NO 3)3·6H2 O) into N, N-Dimethylformamide (DMF), and carrying out ultrasonic treatment to fully dissolve the 2-amino terephthalic acid and the Ce (NO 3)3·6H2 O) in the N, N-dimethylformamide to obtain a reaction solution. (2) The reaction solution was subjected to solvothermal reaction. (3) And (3) sequentially centrifuging and washing the reaction product, soaking in methanol, and drying to obtain the MOFs material. Preferably, in the step (1), the molar ratio of 2-aminoterephthalic acid to Ce (NO 3)3·6H2 O) is 2-aminoterephthalic acid to Ce (NO 3)3·6H2 o=5:1. In the step (1), DMF is only used as a solvent to provide a reaction environment, and the dosage is enough to enable 2-amino terephthalic acid and Ce (NO 3)3·6H2 O to be completely dissolved, and can be excessive, so that the performance of a final product and the reaction process are not influenced by the excessive DMF. Preferably, in the step (2), the solvothermal reaction temperature is 110-130 ℃ and the reaction time is 22-26h. Preferably, in step (1), the ultrasonic frequency is 55-65Hz. Preferably, in the step (3), the centrifugal speed is 4000-5000rpm, and the centrifugal time is 4-5min. Preferably, in step (3), the solid product obtained after centrifugation is washed three times with DMF and then three times with methanol. Preferably, in the step (3), after soaking in methanol for 22-26 hours, fresh methanol is replaced and soaked for 22-26 hours again, and drying is performed. Preferably, in step (3), the drying temperature is 55-65 ℃ and the drying time is 12-16h. The invention has the beneficial effects that: 1. The metal organic framework compound material has excellent optical performance, is driven to emit light by a ligand-guided intramolecular charge transfer process, has high selectivity to PFOS, has strong interference resistance to interferents and other PFAS, can realize visual high-sensitivity detection to the P