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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

787
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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化一个石-伊米达酸框架 和范德瓦尔斯二氧化碳的相互作用以优化吸附性分离

Lik H Wee1, Steven Vandenbrande2, Sven M J Rogge2

  • 1Centre for Surface Chemistry and Catalysis Characterisation and Application Team (COK-kat), KU Leuven, Celestijnenlaan 200F, Leuven B3001, Belgium.

Journal of the American Chemical Society
|February 17, 2021
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概括

一种新的材料,COK-17,通过增强的相互作用选择性地吸附二氧化碳 (CO2) 而不是甲 (CH4). 这种灵活的焦化物 - 胺酸框架对生物气改造等气体分离应用具有前景.

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科学领域:

  • 材料科学
  • 化学工程
  • 吸附科学

背景情况:

  • 二氧化碳 (CO2) 和甲 (CH4) 的分子分离对于生物气体升级,碳捕获和天然气净化至关重要.
  • 现有的吸附剂在实现高选择性和二氧化碳分离能力方面面临挑战.

研究的目的:

  • 引入一种具有增强二氧化碳亲和力的新型焦化物 - 胺酸框架 (ZIF),即COK-17.
  • 研究COK-17中选择性二氧化碳吸附的机制.

主要方法:

  • 对COK-17框架的综合和描述.
  • 用X射线衍射和瑞特维尔德精细化进行结构分析.
  • 周期密度函数理论 (DFT) 的计算和广大规范蒙特卡洛 (GCMC) 模拟用于吸附研究.

主要成果:

  • 对于COK-17来说,它具有灵活的结构,既有闭孔的阶段,也有开孔的阶段.
  • 选择性二氧化碳吸附是由伦敦分散力和替代物的相互作用驱动的.
  • 与ZIF-8和ZIF-71等基准ZIF材料相比,CO2/CH4的分离性能更好.

结论:

  • 由于其独特的结构特征和功能化,COK-17是一种高效的选择性二氧化碳吸收剂.
  • 这些发现为开发高效气体分离工艺的先进材料提供了新的途径.