Research Progress in Separation and Enrichment of Metal by Covalent Organic Frameworks
As industrial development advances,the intensification of heavy metal and radioactive substance pollution has coincided with a growing demand for rare metals.Consequently,it is essen-tial to implement a process of separation and enrichment of metals.Covalent organic frameworks(COFs),which are distinguished by large specific surface area,high porosity,high crystallinity,and adjustable pore size,have emerged as promising materials for metal separation and enrichment.The selectivity of COFs for specific metal ions can be enhanced through the incorporation of tailored functional groups.Furthermore,the robust covalent bonds within COFs contributes to their stability in harsh environments.Given the above,this paper offers a comprehensive overview of the applica-tion of COFs in metal separation and enrichment in recent years.It focuses on the diverse connection modes of COFs and their associated separation,enrichment,and adsorption mechanisms in precious metals,heavy metals,rare earth elements,and radioactive elements.Finally,the article address-es presents a comprehensive analysis of the challenges associated with the practical application of COFs for the separation and enrichment of metals,while also offering insights for future research.
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