结合的几何和电子结构效应控制的选择性吸附的酸盐使用过渡金属交叉链接奇托:一个DFT研究
Obinna Nwokonkwo1, Christopher Muhich1,2
1Chemical Engineering, School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States of America.
The journal of physical chemistry. B
|December 17, 2025
概括
电子结构决定了过渡金属交联酸盐 (TMC) 吸附剂的选择性氧化离子结合. 动态电子灵活性,特别是旋转状态的适应性,是水处理应用中增强酸盐 () 捕获的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 计算化学的计算化学
背景情况:
- 水中的污染对健康构成重大风险.
- 过渡金属交联酸盐 (TMC) 吸收剂在去除酸盐等氧化离子方面表现有前途.
- 了解选择性离子结合的基本机制对于吸附剂设计至关重要.
研究的目的:
- 研究TMC吸附剂中选择性氧化离子结合的电子结构基础.
- 评估酸盐 (As(V),酸盐 (As(III) 和酸盐 (P(V)) 与各种过渡金属的竞争性结合.
- 建立下一代的向吸附剂的设计框架.
主要方法:
- 密度函数理论 (DFT) 的计算被用来建模氧离子结合.
- 在+2和+3氧化状态和不同的协调环境下研究了八种第一行过渡金属 (V-Zn).
- 统计相关性和回归建模被用来将电子性质与绑定选择性联系起来.
主要成果:
- 结合强度和选择性由电子结构控制,特别是过渡金属d状态和旋转状态适应性的能量扩散.
- 酸盐 (As(V)) 的选择性与更广泛的d-轨道能量分布和更大的旋转状态重组有很强的相关性.
- 特定的金属-基托复合物 (Fe2+-CS,Ni2+-CS,Co3+-CS) 通过独特的电子和几何构造表现出高AsV选择性.
结论:
- 金属中心的动态电子灵活性是选择性酸盐 (As(V)) 捕获的主要因素.
- 洞察力超越了传统的描述符,突出了电子重组在绑定时的重要性.
- 该研究提供了一个可调节的设计框架,用于开发高效的吸附剂,以从复杂的水矩阵中去除.
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