| 含低聚醚链共价有机骨架薄膜材料的制备及其离子分离性能 | |
| Preparation and ion separation performance of oligoether chains enriched covalent organic framework membrane | |
| 摘要: 用2，5-二(2-甲氧基-乙氧基)对苯二甲酰肼(BMTH)和1，3，5-三甲氧基-2，4，6-三甲酰基苯(TpOMe)缩聚，基于界面聚合法，在多孔三氧化二铝(AAO)基底上制备出一种二维共价有机骨架(COF)膜TpOMe-BMTH，并研究了所得膜材料对锂、镁离子的分离性能。结果显示，TpOMe-BMTH/AAO膜具有高的结晶性和良好的稳定性，并表现出优异的金属离子选择性，在LiCl(0.1 mol·L-1)和MgCl2(0.1 mol·L-1)组成的二元混合离子体系中，对Li+/Mg2+的分离因子高达258。基于密度泛函理论的平面波赝势方法计算表明，材料孔道中的富氧低聚醚链对 Li+和 Mg2+的结合能分别为-282.69和-13.46 kJ·mol-1，使材料表现出强的亲锂特性，促进了Li+沿着COF膜的一维孔道进行吸附扩散，最终实现锂、镁离子的高效分离。 | |
| 关键词: 共价有机骨架 薄膜 离子分离 | |
| 基金项目: 青海省自然科学基金(No.2020-ZJ-742)、国家自然科学基金(No.214610211)、青海省“昆仑英才·高端创新创业人才”项目资助。 | |
| Abstract: The two-dimensional covalent organic framework (COF) membrane material TpOMe-BMTH was prepared on the anodic aluminum oxide (AAO) substrate with 2,5-di-(2-methoxy-methoxy-ethoxy)-phenylmethylhydrazide (BMTH) and 2,4,6-trimethoxy-1,3,5-benzenetricarbaldehyde (TpOMe) condensation based on interfacial polymerization. The separation properties of the obtained membrane material for lithium and magnesium ions were investigated. Results showed that the TpOMe BMTH/AAO membranes possessed high crystallization, good stability, and excellent metal ion selectivity, with a separation factor of up to 258 for Li+/Mg2+ in a binary salt system consisting of LiCl (0.1 mol·L-1) and MgCl2 (0.1 mol·L-1). The plane wave pseudopotential method calculation based on the density functional theory showed that the binding energy of the oxygen-rich oligoether chains in the material pore for Li+ and Mg2+ was -282.69 or -13.46 kJ·mol-1. This result means that the obtained membrane has stronger lithium-philic properties and promotes Li+ adsorption diffusion along the one dimensional pore of the COF membrane, finally enabling the efficient separation of lithium and magnesium ions. | |
| Keywords: covalent organic framework membrane ion separation | |
| 投稿时间：2024-02-15 修订日期：2024-06-05 | |
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| 谢文典,隆月华,谢健阳,邢丽群,佘世雄,杨燕,黄智昊.含低聚醚链共价有机骨架薄膜材料的制备及其离子分离性能[J].无机化学学报,2024,40(8):1528-1536. | |
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