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Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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相关实验视频

Updated: Feb 12, 2026

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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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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在共价有机框架中通过乙烯基定位进行电子结构调制,以增强低度捕获.

Lingli Zhang1, Li Wang1, Feng Luo1

  • 1National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing, East China University of Technology, Nanchang 330013, China.

Nano letters
|February 10, 2026
PubMed
概括

在共价有机框架 (COF) 中嵌入框架的乙基显著提高了捕获能力. 这种设计原理在工业条件下为放射性去除提供了卓越的性能.

科学领域:

  • 材料科学 材料科学 材料科学
  • 吸附科学 吸附科学
  • 环境化学环境化学

背景情况:

  • 从工业排放中捕获是一项挑战.
  • 具有乙基的共价有机框架 (COF) 显示出对吸附的前景.
  • 在COF中乙烯基基组的位置 (嵌入式与悬挂式) 影响性能.

研究的目的:

  • 研究COF中乙烯基组定位对吸附的影响.
  • 为了合成和表征嵌入框架的乙烯基-COF (TPEB-TAPB-COF),孔悬挂的乙烯基-COF (BPO-TAPB-COF) 和非乙烯基的COF (TFPB-TAPB-COF).
  • 在和蒸汽和模拟工业条件下评估捕获性能.

主要方法:

  • 三种不同的COF合成,具有不同的乙烯基组配置.
  • 在和蒸汽下测量吸附能力.
  • 在模拟的工业条件下 (150°C,150 ppmv I2) 进行吸附试验.

主要成果:

  • 在和条件下,TPEB-TAPB-COF (嵌入框架) 实现了8.65g/g的高捕获能力.
  • 在BPO-TAPB-COF中,相对依赖的乙基因组由于有限的电子移位而显示出减少的容量.
  • 在模拟的工业条件下,TPEB-TAPB-COF表现出色 (0.493 g/g),性能优于大多数多孔材料.
关键词:
吸附方式 吸附方式 吸附方式共价有机框架共价有机框架放射性的捕获 放射性捕获

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结论:

  • 嵌入框架的乙基增强了电子移位,导致COF中优异的吸附.
  • 乙基的定位对于优化捕获中COF性能至关重要.
  • 本研究提出了一个新的设计策略,用于开发先进的放射性捕获材料.