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CN-122006674-A - Metal organic framework derivative material for carbon dioxide adsorption and trapping and preparation method and application thereof

CN122006674ACN 122006674 ACN122006674 ACN 122006674ACN-122006674-A

Abstract

The invention provides a metal organic framework derivative material for carbon dioxide adsorption and trapping, and a preparation method and application thereof, wherein the preparation method comprises the following steps of mixing 2-methylimidazole, zinc nitrate hexahydrate and methanol to obtain ZIF-8; mixing ZIF-8 with organic solvent and tetraethoxysilane, standing in a closed environment containing ammonia water to obtain ZIFC precursor, sintering ZIFC precursor, mixing the obtained product with alkali solution, performing ultrasonic treatment, centrifuging, and drying to obtain the metal organic framework derivative material for carbon dioxide adsorption and trapping. The metal organic framework derivative material provided by the invention overcomes the problems of insufficient low-concentration carbon adsorption performance and cycle stability of the existing metal organic framework material in a moisture-containing environment, can effectively separate and trap trace CO 2 , is simple to prepare, has mild conditions, and is suitable for industrial production.

Inventors

  • HE HONG
  • MA JINZHU
  • SHEN MINGHAI

Assignees

  • 中国科学院生态环境研究中心

Dates

Publication Date
20260512
Application Date
20260401

Claims (10)

  1. 1. A method for preparing a metal organic framework derivative material for carbon dioxide adsorption capture, the method comprising the steps of: s1, mixing 2-methylimidazole with zinc nitrate hexahydrate and methanol to obtain ZIF-8; S2, mixing ZIF-8 with an organic solvent and ethyl orthosilicate, and then placing the mixture in a closed environment containing ammonia water for standing to obtain ZIFC precursor; and S3, sintering ZIFC precursor, mixing the obtained product with alkali solution, performing ultrasonic treatment, centrifuging and drying to obtain the metal organic framework derivative material for carbon dioxide adsorption and trapping.
  2. 2. The method according to claim 1, wherein the molar ratio of 2-methylimidazole to zinc nitrate hexahydrate in step S1 is (5-10): 1.
  3. 3. The preparation method according to claim 1 or 2, wherein the organic solvent in step S2 comprises any one or a combination of at least two of petroleum ether, n-hexane, n-heptane or o-xylene.
  4. 4. The process according to any one of claims 1 to 3, wherein the molar ratio of the organic solvent, ethyl orthosilicate to ammonia in aqueous ammonia in step S2 is 1.5 to 12:1.5 to 8.
  5. 5. The method according to any one of claims 1 to 4, wherein the standing time in step S2 is 12 to 24 h.
  6. 6. The method according to any one of claims 1 to 5, wherein the specific procedure of sintering in step S3 is to heat up to 300 ℃ at a rate of 1 to 2 ℃ per minute, then heat up for 2 to 4 hours, and then heat up to 350 to 600 ℃ at a rate of 0.5 to 1.5 ℃ per minute, and heat up for 2 to 4 hours.
  7. 7. The method according to any one of claims 1 to 6, wherein the alkaline solution in step S3 comprises sodium hydroxide solution.
  8. 8. The method according to claim 7, wherein the molar ratio of sodium hydroxide to ethyl orthosilicate in the sodium hydroxide solution is (0.05-0.8): 1.
  9. 9. A metal-organic framework derivative material for carbon dioxide adsorption capture prepared by the preparation method according to any one of claims 1 to 8.
  10. 10. Use of a metal organic framework derivative material according to claim 9 in carbon adsorption trapping.

Description

Metal organic framework derivative material for carbon dioxide adsorption and trapping and preparation method and application thereof Technical Field The invention belongs to the technical field of carbon capture, and particularly relates to a metal organic framework derivative material for carbon dioxide adsorption capture, and a preparation method and application thereof. Background Under the background of continuous promotion of global carbon emission reduction targets, how to realize high-efficiency and low-energy-consumption separation under the condition of extremely low partial pressure of carbon dioxide has become a core science and engineering problem faced by carbon capture technology. Particularly, in the application scenes of air trapping (DAC), high-purity nitrogen, deep purification of inert gas and the like, the concentration of CO 2 is usually as low as 400 ppm, the adsorption driving force is weak, the selectivity requirement is high, and more severe requirements are put on the micropore integrity and interface chemistry of the adsorption material. The traditional strategy relying on high adsorption enthalpy or strong chemical interaction often accompanies the problems of large regeneration energy consumption, insufficient structural stability and the like, and is difficult to combine the performance and the practical application feasibility. Metal organic framework Materials (MOFs) are considered as important candidate materials for addressing the trace CO 2 separation challenge due to their regularly tunable pore structure and designable coordination environment. However, typical MOFs (such as ZIF-8) still face the contradiction between thermal stability and structural retention in practical applications, in which high temperature treatment can improve material stability but inevitably leads to frame collapse and reduction in specific surface area, while materials can retain crystal structure at low temperature, but still have shortcomings in cyclic stability and environmental suitability. And MOFs have the problems of poor stability and easy structure decomposition for CO 2 smoke containing water vapor. Therefore, how to balance structural integrity, surface chemical adjustability, and operational stability is a key to the further development of MOF-based adsorbent materials. In recent years, MOF-derived carbon materials impart greater chemical and thermal stability to the material by thermal conversion, but complete carbonization is often accompanied by disappearance of the original microporous structure, significantly diminishing its size sieving advantage in low partial pressure CO 2 separation. This suggests that either a single "retained MOF" or "fully carbonized" strategy is difficult to meet the comprehensive requirements of trace CO 2 capture. Therefore, how to develop a mild and controllable MOF derivative strategy, while avoiding the complete damage of a high-temperature structure, introducing a carbon phase to adjust interface chemistry and pore channel environment, and providing a new material design thought for improving the separation performance of 400 ppm CO 2/N2 becomes a problem to be solved urgently. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a metal organic framework derivative material for carbon dioxide adsorption and trapping, and a preparation method and application thereof. The metal organic framework derivative material provided by the invention overcomes the problems of insufficient low-concentration carbon adsorption performance and cycle stability of the existing metal organic framework material in a moisture-containing environment, can effectively separate and trap trace CO 2, is simple to prepare, has mild conditions, and is suitable for industrial production. In order to achieve the aim of the invention, the invention adopts the following technical scheme: in a first aspect, the present invention provides a method for preparing a metal organic framework derivative material for carbon dioxide adsorption capture, the method comprising the steps of: s1, mixing 2-methylimidazole with zinc nitrate hexahydrate and methanol to obtain ZIF-8; S2, mixing ZIF-8 with an organic solvent and ethyl orthosilicate, and then placing the mixture in a closed environment containing ammonia water for standing to obtain ZIFC precursor; and S3, sintering ZIFC precursor, mixing the obtained product with alkali solution, performing ultrasonic treatment, centrifuging, and drying to obtain the metal organic framework derivative material (ZIFC) for carbon dioxide adsorption and trapping. The ZIFC prepared by adopting the specific reagent through the template method on the basis of ZIF-8 has the advantages of simple preparation and mild conditions, and can enable the product to form a specific microporous structure, so that the product overcomes the problem that the existing metal organic framework material is insufficient in low-conce