Back to Search
Start Over
Efficient adsorption and advanced purification of metal ions induced by synergistic effect of amine and thione on covalent organic frameworks.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Jun2024, Vol. 691, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Covalent organic frameworks (COFs) have been widely employed for metal ion adsorption owing to their inherent advantages, encompassing low crystal density, well-organized organic unit structures, adjustable pore size, and remarkable structural stability. However, it is still a great challenge to design excellent COFs with high adsorption and advanced purification capabilities for Pb2+ and Cd2+ ions. Herein, hydrazine-linked COFs (COF-TCH) were prepared for effective adsorption and advanced purification of metal ions. The adsorption capacity of COF-TCH for Pb2+ and Cd2+ ions are 395.3 and 153.5 mg/g, respectively. Moreover, the Pb2+ and Cd2+ ions in water can be treated from 75 and 30 mg L−1 to less than 0.01 and 0.003 mg L−1, respectively, indicating the excellent adsorption and advanced purification capability of COF-TCH. This is a rare example of COFs adsorbent that deeply purify water to meet the guideline values in drinking water for the World Health Organization. FT-IR, XPS and quantum mechanics calculation were performed to understand the adsorption mechanism. The remarkable adsorption and advanced purification capability of COF-TCH for Pb2+ and Cd2+ ions can be attributed to the synergistic interaction between the amine and thione groups, which can easily complex with Pb2+ and Cd2+ ions to form stable five-membered ring structure in COF-TCH. In addition, COF-TCH still remains an adsorption capacity of over 90% after ten adsorption-desorption cycles, indicating its excellent reusability and stability. COF-TCH with high adsorption and advanced purification capability, high stability, low cost and reusability has enormous practical application potential in high-performance remediation of Pb2+ and Cd2+ contaminated water. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 691
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 176718924
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2024.133924