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相关概念视频

Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

369
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
369
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
336
Ion Exchange01:17

Ion Exchange

553
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...
553
Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

368
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
368
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

459
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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高效的离子选由MOF/COF双层膜通过多种分离机制促进.

Yu Ma1, Lin Liu1, Ruihe Yu1

  • 1Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|November 28, 2024
PubMed
概括

一种结合金属有机框架 (MOFs) 和共价有机框架 (COFs) 的新型混合膜显著增强了离子分离,实现了高Li+/Mg2+比率以有效提取.

关键词:
两个层的膜膜.共价有机框架是共价有机框架.离子选择性运输 - 离子选择性运输金属有机框架的框架.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 分离科学 分离科学

背景情况:

  • 多孔有机框架 (POFs),包括金属有机框架 (MOFs) 和共价有机框架 (COFs),由于定义的通道和功能站点,它们的离子选择性特性得到了认可.
  • 单独的MOF和COF具有限制,这阻碍了它们在离子分离应用中的全部潜力.
  • 需要新的策略来克服这些局限性并增强离子选择性.

研究的目的:

  • 开发一种混合双层膜,在尼龙基板上集成MOF和COF,以改善离子分离.
  • 研究将一个离子排斥MOF (ZIF-8) 与一个离子协调COF (TpPa-SO3H) 的协同效应.
  • 评估膜对选择性离子 (Li+) 提取的性能.

主要方法:

  • 在尼龙基板上使用连续的液体-液体接口聚合制造混合双层膜.
  • 集成ZIF-8 (MOF) 和TpPa-SO3H (COF) 层,形成强大的化学键和高效的离子输送通道.
  • 膜离子分离性能的表征,特别是Li+/Mg2+分离比.

主要成果:

  • 开发的ZIF-8/TpPa-SO3H/尼龙膜显示出501.1的显著Li+/Mg2+分离比.
  • 与原始的ZIF-8 (400倍高) 和TpPa-SO3H (200倍高) 膜相比,这种性能显著提升.
  • 增强的选择性归因于ZIF-8的静电离子排斥和TpPa-SO3H的离子协调的协同组合.

结论:

  • 混合双层膜由于结合的静电和协调效应,表现出优越的离子分辨能力.
  • 膜具有出色的结构完整性和化学稳定性,对于实际应用至关重要.
  • 这种先进的膜技术显示出大规模从盐湖等来源提取的重大前景.