合成共价有机框架,实现前所未有的捕获性能
Shaikha S AlNeyadi1, Mohammed T Alhassani2, Ali S Aleissaee1
1Department of Chemistry College of Science, UAE University Al-Ain, 15551, United Arab Emirates.
Heliyon
|February 29, 2024
概括
新的共价有机框架 (COF) 提供优越的放射性捕获,解决核废物挑战. 这些材料表现出高容量,高效率和可重复使用的环境和健康保护.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 核工程 核工程是指核工程.
背景情况:
- 核能产生放射性废物,带来环境和健康风险.
- 有效的放射性废物管理对于核安全至关重要.
- 共价有机框架 (COF) 具有可调节的结构,用于潜在的吸附应用.
研究的目的:
- 开发和评估用于有效捕获放射性的新型COF.
- 在容量,选择性和可重复使用性方面评估新型COF的性能.
- 了解在已开发的COF上吸附的机制.
主要方法:
- 三种新型COF的合成:SJ-COF,YA-COF和AA-COF.
- COF属性的表征,包括热和化学稳定性.
- 从I2/环素溶液中对吸附能力和去除效率的实验性评估.
- 回收试验和吸附机制分析 (物理化学吸附).
主要成果:
- SJ-COF,YA-COF和AA-COF表现出超高的捕获能力 (8.52,8.12和7.01g/g).
- 实现了高的清除效率:87.9% (SJ-COF),88.6% (YA-COF) 和82.6% (AA-COF) 的情况.
- 碳酸表现出优异的选择性,在五个周期内可重复使用,并且具有强大的保留.
结论:
- 开发的COF为核废物清除提供了一个开创性的标准.
- 作为适应性多孔材料,COF具有巨大的潜力,可用于特定的环境修复.
- 物理化学吸附是与这些COF结合的主要机制.
相关概念视频
Redox Titration: Iodimetry and Iodometry
1.7K
Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
1.7K
Precipitation of Ions
27.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.9K
Formation of Complex Ions
23.6K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.6K
Predicting Molecular Geometry
34.3K
VSEPR Theory for Determination of Electron Pair Geometries
34.3K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
6.0K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.0K
Lewis Structures of Molecular Compounds and Polyatomic Ions
34.8K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
34.8K


