减少诱导的Cs的摄入+在金属有机框架载有多氧金属酸盐
Cocoro A Nagasaka1, Naoki Ogiwara1, Shunsuke Kobayashi2
1Department of Basic Science, School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
Small (Weinheim an der Bergstrasse, Germany)
|December 25, 2023
概括
将金属有机框架 (MOF) 与聚氧甲酸盐 (POM) 混合,可以增强离子 (Cs+) 的捕获. PMo12/ZIF-8复合物显示出优异的Cs+吸附,特别是在POM中减少了后.
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:
- 离子 (Cs+) 吸附对于处理各种溶液至关重要.
- 金属有机框架 (MOF) 为吸附提供了很大的表面积,但它们用于捕获离子,包括Cs+,是有限的.
- 聚氧甲酸盐 (POMs) 被探索为功能成分,以提高MOF的性能.
研究的目的:
- 调查MOF类型,POM类型和POM负载对Cs+捕获效率的影响.
- 开发用于有效的Cs+吸附的新型混合材料.
- 了解MOF-POM复合材料中增强的Cs+吸收背后的机制.
主要方法:
- 合成MOF-POM杂交材料,特别是ZIF-8与[α-PMo12O40]3- (PMo12/ZIF-8)进行杂交.
- 使用各种技术评估Cs+吸附能力和选择性.
- 研究POM降低 (MoVI到MoV) 对酸处理的Cs+吸收的作用.
主要成果:
- 与原始ZIF-8相比,PMo12/ZIF-8复合物表现出明显更高的Cs+吸附率.
- 在POM (MoVI到MoV) 中通过酸降低,有效地使PMo12/ZIF-8的Cs+吸收能力翻了一番.
- 与其他MOF (MIL-101,UIO-66) 的杂交表明 Cs+吸收减少,这表明疏水性的重要性.
- PMo12/ZIF-8从复杂的金属离子混合物中获得了291.5毫克g-1的异常Cs+吸收,具有79.6%的选择性.
结论:
- MOFs与POMs的杂交是一种增强Cs+捕获的有希望的策略.
- PMo12/ZIF-8复合材料在Cs+吸附和选择性方面表现出色.
- MOF的疏水性在有效的Cs+捕获中起着至关重要的作用.
- 观察到的Cs+吸收的增强与减少后POM负荷的增加有关.
更多相关视频
相关概念视频
Extraction: Advanced Methods
448
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...
448
Metal-Ligand Bonds
20.8K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.8K
Crystal Field Theory - Octahedral Complexes
26.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.6K
Formation of Complex Ions
23.7K
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...
23.7K
Properties of Organometallic Compounds
1.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.0K
Complexation Equilibria: Factors Influencing Stability of Complexes
373
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
373


