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相关概念视频

Structure of Amines01:19

Structure of Amines

2.4K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.4K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

3.2K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.2K
Mass Spectrometry of Amines01:19

Mass Spectrometry of Amines

4.1K
In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule: a molecule with an odd number of nitrogen atoms produces a parent ion with an odd molecular weight. The remaining fragments have an even mass.
Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit...
4.1K
Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

295
Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
295
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

2.3K
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
2.3K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

41.5K
Effect of Lone Pairs of Electrons on Molecule Geometry
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相关实验视频

Updated: May 16, 2025

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
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Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

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高性能氨分离的多变量共价有机框架:结构-性质-功能关系

Yunhui Zhang1,2,3,4, Jinglin Liu1, Tao Wang1

  • 1College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 1, 2025
PubMed
概括

研究人员开发了硫化共价有机框架 (COF) 来有效地从水中去除氨 (NH4+-N). 这些新型材料具有很高的吸附能力和超快的动力学,为清除水污染提供了有希望的解决方案.

关键词:
吸附吸附是一种吸附.氨的气是氨中的一种.吸收电离子的捕获方式协价有机框架 协价有机框架结构-财产-功能关系关系.

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Ammonia Synthesis at Low Pressure
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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科学领域:

  • 材料科学 材料科学 材料科学
  • 环境化学环境化学
  • 纳米技术 纳米技术

背景情况:

  • 从水中去除氨 (NH4+-N) 对于环境保护和资源回收至关重要.
  • 与其他离子相比,吸附NH4+-N是具有挑战性的,因为它具有稳定的结构和较大的离子半径.
  • 共价有机框架 (COF) 为吸附应用提供可调节的结构.

研究的目的:

  • 设计和合成硫化COF,以提高NH4+-N吸附.
  • 调查结构-性质-功能关系,控制COF中的NH4+-N吸附.
  • 为了阐明NH4+-N吸附的原子层机制.

主要方法:

  • 为了制造硫化COFs,采用了一种"多变量"合成策略.
  • 评估了具有不同硫酸组密度的COF的吸附性能.
  • N K-边缘近边缘X射线吸收细结构光谱学被用来研究吸附机制.

主要成果:

  • 50%的最佳硫酸组密度产生了17.09 mg g-1的吸附能力和5分钟的平衡时间.
  • 碳化合物的结晶性对吸附能力和动力学产生了积极影响.
  • 表面积和水友性增强了容量,而毛孔大小不同地影响了容量和动力学.
  • 鉴定出离子交换和结合是主要的吸附机制.

结论:

  • 与现有的吸附剂相比,硫化COF在NH4+-N捕获方面表现优越.
  • 材料的特性,如结晶度,表面积,水友性和孔径大小,极大地影响吸附.
  • 这项研究为设计先进吸附剂提供了一个框架,以有效地去除阴子.