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Novel pyridine-based covalent organic framework containing N,N,N-chelating sites for selective detection and effective removal of nickel
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2022-06-22 , DOI: 10.1039/d2qi00779g
Yongqiang Li, Quan Wang, Yuhua Ju, Yarong Li, Yanbo Zhang, Ronggui Hu

The development of novel materials with dual functions of simultaneous detection and removal of heavy metal ions has been an important pursuit of environmental remediation. Herein, we demonstrate that two-dimensional covalent organic frameworks (COFs) with well-defined functional chelating sites can combine the inherent advantages of COF materials to prepare novel materials with the dual functions of selective detection and effective removal of Ni2+ from aqueous solutions. A new pyridine-based COF material (TAPA–PCBA) containing functional N,N,N-chelating sites has been designed and synthesized by the imine condensation reactions between tris(4-aminophenyl)amine and 2,6-pyridinedicarboxaldehyde under solvothermal conditions. The newly designed TAPA–PCBA possesses high crystallinity, moderate specific surface area and robust chemical and thermal stability. These excellent properties of TAPA–PCBA, together with its extended π-conjugated framework structure and the dense distribution of functional N,N,N chelating sites, enable TAPA–PCBA to selectively detect and effectively remove Ni2+ from aqueous solutions. This dual function can be attributed to the coordination interactions between Ni2+ and N,N,N-chelating sites embedded in the skeleton structure of TAPA–PCBA. These results reveal that COFs with reasonable design have great development prospects in heavy metal ion related environmental remediation.

中文翻译:

新型吡啶基共价有机骨架,含有 N,N,N-螯合位点,用于选择性检测和有效去除镍

开发具有同时检测和去除重金属离子双重功能的新型材料一直是环境修复的重要追求。在此,我们证明了具有明确功能螯合位点的二维共价有机框架(COFs)可以结合COF材料的固有优势,制备具有选择性检测和有效去除Ni 2+双重功能的新型材料。来自水溶液。通过三(4-氨基苯基)胺和2,6-吡啶二甲醛在溶剂热条件下的亚胺缩合反应,设计并合成了一种新型的吡啶基COF材料(TAPA-PCBA),该材料含有功能性N,N,N-螯合位点。新设计的 TAPA-PCBA 具有高结晶度、适中的比表面积和强大的化学和热稳定性。TAPA-PCBA 的这些优异性能,再加上其扩展的 π 共轭骨架结构和功能性 N、N、N 螯合位点的密集分布,使 TAPA-PCBA 能够选择性地检测并有效去除水溶液中的 Ni 2+ 。这种双重功能可以归因于Ni 2+之间的配位作用以及嵌入 TAPA-PCBA 骨架结构中的 N,N,N-螯合位点。这些结果表明,设计合理的COFs在重金属离子相关环境修复方面具有很大的发展前景。
更新日期:2022-06-22
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