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Extraction: Advanced Methods00:56

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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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Alexander V Neimark1, Nicholas J Corrente1, François-Xavier Coudert2

  • 1Department of Chemical and Biochemical Engineering, Rutgers, The State University of New Jersey, 98 Brett Road, Piscataway, New Jersey 08854, United States.

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概括

灵活的金属有机框架 (MOF) 在气体吸附时表现出呼吸阶段过渡. 一个新的理论框架解释了二氧化碳如何在MIL-53 MOF中取代甲,触发这些转换.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 纳米技术 纳米技术

背景情况:

  • 气体吸附会诱导纳米孔材料的变形,这对于气体储存和分离等应用至关重要.
  • 金属有机框架 (MOF) 呈现"呼吸"阶段转换,涉及客分子吸附/脱附的显著体积变化.

研究的目的:

  • 开发一个理论框架,以量化描述MOF在二元气体混合物吸附过程中的呼吸过渡.
  • 阐明MIL-53 MOF中框架变形和相位转换 (大孔向窄孔) 的机制.

主要方法:

  • 开发了一个基于吸附应力概念的理论框架.
  • 应用框架来建模MIL-53 MOF中二氧化碳 (CO2) 对甲 (CH4) 的取代.
  • 将理论预测与吸附和应变异热体的实验数据进行比较.

主要成果:

  • 在甲吸附过程中,微小的二氧化碳添加会使MIL-53 MOF的大孔 (LP) 阶段不稳定,从而触发过渡到狭孔 (NP) 阶段.
  • 反向的狭孔向大孔 (NP-LP) 转换发生在甲进一步被二氧化碳所取代时.
  • 吸附和应变等温的理论预测与MIL-53的实验研究非常一致.

结论:

  • 提出的理论方法准确地描述了MOF中由二元气体混合物诱导的呼吸阶段过渡.
  • 该研究揭示了由选择性气体吸附驱动的框架变形的潜在机制.
  • 一般框架适用于其他灵活的纳米多孔材料和气体混合物.