热驱动的 CoCl 的捕获和释放
Sheng-Yin Huang1, Debmalya Ray2, Qian Zhang1
1Department of Chemistry, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States.
Journal of the American Chemical Society
|August 5, 2024
概括
一种新的热驱动策略使得可选择性捕获和释放的受体停滞不前. 这种方法通过温度变化有效地将与其他金属离子分离,为金属回收提供了有前途的方法.
科学领域:
- 材料科学
- 协调化学
- 分离科学
背景情况:
- 开发有效和选择性的金属离子捕获方法对于资源回收和环境修复至关重要.
- 固定受体在分离过程中具有优势,使捕获剂更容易回收和重复使用.
研究的目的:
- 开发一种热驱动的捕获和释放策略,用于选择性捕获化物 (CoCl2).
- 调查对其他过渡金属的固定受体的结合机制和选择性.
主要方法:
- 在聚烯上合成和表征一个固定中性二环乙基受体 (PS-L).
- 用X射线衍射分析确定L·CoCl2的复杂结构.
- 紫外线光谱和范特霍夫分析以研究温度依赖的结合热力学.
- Langmuir-Freundlich异热分析以评估CoCl2对MnCl2和NiCl2的选择性
- 诱导合等离子质谱 (ICP-MS) 用于量化金属离子丰富.
- 密度函数理论 (DFT) 计算用于理论验证.
主要成果:
- 鉴定出一个由六合协调的离子和四离子组成的离子对复合体.
- 热力学研究表明结的和变化有利,PS-L + CoCl2的值为 ΔH° = 16.5 kJ/mol和 ΔS° = 85.0 J/K·mol.
- 固定受体PS-L对CoCl2 (K_LF=88.5M−1) 具有比MnCl2 (52.7M−1) 和NiCl2 (49.7M−1) 的选择性.
- 在模拟离子混合物中完成了三次捕获释放循环后,可选择性缩至76.6%.
- DFT计算证实了实验结果,证实了Co比Mn和Ni对受体的结合更强.
结论:
- 开发的热驱动策略可以有效和选择性地捕获和释放离子.
- 固定受体对具有显著的选择性,使其适用于分离应用.
- 这种方法为复杂混合物中的回收和净化提供了一种可持续的方法.
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