在Ti3C2TxMXene膜中协调的阴离体运输
Austin J Booth1,2, Qinsi Xiong3, Woo Cheol Jeon3
1Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08540, United States.
ACS applied materials & interfaces
|June 24, 2025
概括
使用Ti3C2Tx MXene进行膜纳米过,由于具有竞争性的阴离子结合,混合物中的离子选择性降低. 了解这些动态对于设计高效的离子选膜来回收金属至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 环境工程 环境工程
背景情况:
- 膜纳米过对于从废水中选择性回收金属至关重要.
- 精确控制膜纳米通道的大小和化学成分对于有效的离子选至关重要.
- 碳化 (Ti3C2Tx) MXene提供了一个稳定的二维材料平台,用于创建具有可调节层间空间的层状膜.
研究的目的:
- 调查Ti3C2Tx MXene膜的离子传输行为和选择性,在含有混合离子溶液的水环境中.
- 阐明在MXene纳米通道中不同子 (例如Li+,Na+,Ca2+) 之间的竞争效应.
- 为先进的离子面膜的合理设计提供见解.
主要方法:
- 层状Ti3C2Tx MXene膜的制造.
- 使用单盐和双盐混合物测试离子透性和选择性的实验测量.
- 计算模拟包括分子动力学 (MD) 和密度函数理论 (DFT).
- 使用X射线衍射 (XRD) 进行表征.
主要成果:
- MXene层间间距和化学物质显著影响离子透和选择性.
- 二元混合物中子 (Li+,Na+,Ca2+) 之间的竞争性相互作用导致与单盐条件相比,膜选择性降低.
- 具有较强MXene亲和力的离子优先占据纳米通道,通过电荷或尺寸排除阻碍其他离子.
- 模拟结果支持观察到的竞争排除机制.
结论:
- 复杂混合物中的离子-离子和离子间层相互作用对MXene膜中的离子运输和选择性产生很大的影响.
- 强结合的阳离子对纳米通道的优先占用是减少选择性的主要机制.
- 了解这些竞争动态对于优化基于MXene的膜来进行选择性离子分离和从具有挑战性的水流中回收有价值金属至关重要.
更多相关视频
相关概念视频
02:42Valence Bond Theory
9.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.7K
01:19Membrane Asymmetry Regulating Transporters
5.0K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
5.0K
01:17Pore Transport and Ion-Pair Transport
663
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
663
01:44The Significance of Membrane Transport
29.8K
The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
29.8K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
44.8K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
44.8K
01:34Protein Transport into the Inner Mitochondrial Membrane
4.1K
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Transport of mitochondrial precursors across the TIM23 channel is driven by...
4.1K