堆积
吸附
共价有机骨架
结晶度
离子键合
水溶液
共价键
化学工程
选择性
溶剂热合成
离子交换
铼
化学稳定性
化学
材料科学
离子
无机化学
有机化学
催化作用
结晶学
工程类
作者
Hui Xu,Hao Sun,Junyu Zhang,Hongyang Cao,Guoling Li,Zhong‐Hai Ni
标识
DOI:10.1016/j.seppur.2023.125895
摘要
Rhenium is one of the highly scarce and important metals, and its capture is significant for resource recovery. As the latest generation ion exchange materials, ionic covalent organic frameworks (iCOFs) are desired for the acquisition of Re with large adsorption capacity, excellent selectivity, high stability and well-defined pore structures yet seldom reported. In this paper, two highly ordered iCOFs (TABD-COF and TAPB-COF) are successfully constructed via Zincke reaction by the common solvothermal synthesis. In particular, the morphology and crystallinity of iCOFs can be tuned by adjusting the reaction conditions and the structures of precursors. The analysis of PXRD, SEM, and TEM confirms that the two iCOFs exhibit highly ordered crystalline structures with multilayer stacking. TABD-COF and TAPB-COF perform relatively good thermally stability and high chemical stability in both acidic and basic conditions. Both of the two iCOFs show excellent adsorption performance for aqueous ReO4− (714 mg g−1 for TABD-COF, 633 mg g−1 for TAPB-COF) and fast ion exchange kinetics, in which 98 % of ReO4− are captured within 3 mins and 5 mins. Moreover, they also have outstanding trapping efficiency of ReO4− at excesses of competing anions. This work broadens the synthesis of iCOFs via Zincke reaction and provides two novel iCOFs for efficient capture of ReO4− in complex systems.
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