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相关概念视频

Ion Exchange01:17

Ion Exchange

658
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...
658
Crown Ethers02:36

Crown Ethers

5.4K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
5.4K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

528
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...
528
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

762
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...
762

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相关实验视频

Updated: Sep 11, 2025

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
09:50

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

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工程皇冠以太功能化水凝使选择性氨提取成为可能.

Meibo He1,2, Boyan Xu1,3, Tze Chiang Albert Ng1

  • 1National University of Singapore Environmental Research Institute, 5A Engineering Drive 1, Singapore 117411, Singapore.

Langmuir : the ACS journal of surfaces and colloids
|August 18, 2025
PubMed
概括

具有15-皇冠-5的功能化聚烯酸) 水凝显著改善了废水中的氨回收. 这种方法提高了对和离子的选择性,这对于资源回收策略至关重要.

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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相关实验视频

Last Updated: Sep 11, 2025

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09:50

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

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Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
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科学领域:

  • 环境科学 环境科学
  • 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.

背景情况:

  • 氨 (NH4+) 的回收对于从污染物去除到资源回收的过渡至关重要.
  • 由于 (K+) 和 (Na+) 等离子的竞争,从废水中捕获氨很困难.

研究的目的:

  • 通过将它们与15-crown-5 (15C5) 功能化,提高聚烯酸 (PAA) 水凝中的氨选择性.
  • 在存在竞争性子时,研究增强结合和选择性背后的机制.

主要方法:

  • 使用15-皇冠-5.5的PAA水凝的功能化.
  • 对未经修改和修改的水凝进行了阴离子选择性测试.
  • 氨复合和溶解效应的机械分析.

主要成果:

  • 没有修改的PAA水凝显示了K+>Na+>NH4+的阴离子偏好.
  • PAA-g-15C5水凝逆转了选择性顺序到K+ > NH4+ > Na+,改善了Na+的排斥.
  • 在介质离子度 (~1.8 mmol/L) 时,可以达到对Na+ (1.8) 的最佳NH4+选择性.
  • 选择性取决于初始离子度和接触时间,受 1:1 和 2:1 复合的影响.

结论:

  • PAA-g-15C5水凝为从复杂废水中选择性回收氨提供了一个有希望的策略.
  • 对复杂形成和溶解的机械洞察力有助于优化水凝性能,以实现可持续的资源回收.