A kind of metal organic framework material and its preparation method and application

A metal-organic framework, pyrolysis reaction technology, applied in the analysis of materials, material excitation analysis, material analysis by optical means, etc., can solve the problems of poor sensitivity and lack of active sites in MOFs, and achieve the effect of good sensitivity

Active Publication Date: 2021-04-16
广东泰金智能包装有限公司
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Problems solved by technology

[0003] However, when the existing MOFs such as MOF-5 and ZIF-8 are applied in the field of VOCs monitoring, there is a problem of poor sensitivity, which is due to the lack of active sites in traditional MOFs, and it is difficult to graft other structures to combine with VOCs

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  • A kind of metal organic framework material and its preparation method and application
  • A kind of metal organic framework material and its preparation method and application
  • A kind of metal organic framework material and its preparation method and application

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preparation example Construction

[0031] The invention provides a method for preparing a metal organic framework material, comprising the following steps:

[0032] (1) mixing the carbon source, histidine and water, and freeze-drying to obtain a freeze-dried mixture;

[0033] (2) heating the freeze-dried mixture, carrying out a pyrolysis reaction to obtain a pyrolysis reaction liquid, which contains imidazole-modified graphene quantum dots in the pyrolysis reaction liquid;

[0034] (3) Mixing the pyrolysis reaction solution with lye, stirring to obtain an basified solution, adjusting the pH value of the basified solution to 6.5 to 7.5, dialyzing and drying the obtained liquid in sequence to obtain imidazole-modified graphite ene quantum dots;

[0035] (4) The aqueous dispersion of the imidazole-modified graphene quantum dots and the soluble divalent zinc solution are sequentially blended and centrifuged to obtain a metal organic framework material.

[0036] The invention mixes the carbon source, histidine and...

Embodiment 1

[0053] Weigh 8g of citric acid and 2g of histidine into 200mL of deionized water, stir well until the liquid is colorless, put it into a vacuum freeze drying oven and dry at -60°C for 24h to obtain a dry white solid. The obtained white solid was heated for 30 min at a heating temperature of 200°C. During the heating process, the white solid gradually turned into an orange-yellow liquid. After the heating was completed, it was naturally cooled. Prepare a 10 mg / mL sodium hydroxide solution, add it dropwise to the orange liquid (the mass ratio of the sodium hydroxide solution to the orange liquid is 25:1), and stir magnetically at 500 rpm for 15 minutes to obtain an alkalized solution. Use 10wt% dilute hydrochloric acid to adjust the pH value of the alkaline solution to 7, dialyze with a 7000Da dialysis bag for 24 hours, replace the deionized water every 6 hours, collect the liquid in the dialysis bag, and then dialyze the collected liquid with a 500Da dialysis bag for 24 hours ,...

Embodiment 2

[0057] Weigh 4g of citric acid and 2g of histidine into 100mL of deionized water, stir evenly until the liquid is colorless, put it into a vacuum freeze-drying oven and dry at -60°C for 24h to obtain a dry white solid. The obtained white solid was heated for 35 minutes at a heating temperature of 220°C. During the heating process, the white solid gradually turned into an orange-yellow liquid. After the heating was completed, it was naturally cooled. Prepare 10 mg / mL sodium hydroxide solution, add it dropwise to the orange liquid (the mass ratio of sodium hydroxide solution to orange liquid is 30:1), and magnetically stir at 500 rpm for 15 minutes to obtain an alkalized solution. Adjust the pH to 7 with 10wt% dilute hydrochloric acid, dialyze with a 7000Da dialysis bag for 24 hours, change the deionized water every 6 hours, collect the liquid in the dialysis bag, and then dialyze the collected liquid with a 500Da dialysis bag for 24 hours, every 6 hours The deionized water was ...

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Abstract

The invention provides a metal organic framework material and its preparation method and application, belonging to the technical field of composite materials. In the present invention, the carbon source and the freeze-dried mixture of histidine are pyrolyzed to carbonize the carbon source to form graphene quantum dots, and the imidazole decomposed from histidine is modified on the surface of graphene quantum dots; by modifying the graphene with imidazole The quantum dot aqueous dispersion is blended with the zinc chloride solution to complex the zinc ions in the zinc chloride solution with imidazole to form a metal organic framework material composed of 8 regular tetrahedrons arranged in a cube. The metal organic framework material provided by the invention has an imidazole active site, and has higher sensitivity when used for VOCs monitoring.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a metal organic framework material and its preparation method and application. Background technique [0002] Since the 21st century, industrial production has accelerated, air pollution has become more and more serious, especially the excessive emission of volatile organic gases (VOCs), people's demand for timely and accurate environmental pollution monitoring and control is increasing, all of which require excellent performance, That is, a new gas detection adsorption technology with high sensitivity, high selectivity and high reliability. Metal-organic frameworks (MOFs) are porous framework crystal materials self-assembled by metal ions and organic ligands. Its huge specific surface area, adjustability, and structural diversity make it stand out among many porous materials. It has been widely used in detection and adsorption, heterogeneous catalysis and other field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00G01N21/64
CPCC08G83/008G01N21/6428G01N2021/6432
Inventor 焦杰明方长青程有亮朱嘉
Owner 广东泰金智能包装有限公司
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