Abstract
Covalent organic frameworks (COFs) have developed as efficient and selective adsorbents to mitigate 99TcO4− contamination. However, the eco-friendly and scalable production of COF-based adsorbents for the removal of 99TcO4− has not yet been reported. This study explores the potential of a cationic COF (TpDB-COF) synthesized via a green hydrothermal method, achieving gram-scale yields per batch, thereby addressing a significant limitation of existing COF production methods. The TpDB-COF demonstrates an exceptional stability in strongly acidic conditions (2 weeks in 3 M HNO3), as well as in various organic solvents, making it suitable for harsh nuclear waste environments. Adsorption experiments using ReO4− as a surrogate for 99TcO4− show rapid adsorption kinetics, reaching nearly 100% removal efficiency within 1 min (with initial concentration of 28 ppm at a solid-to-liquid ratio of 1 g L−1), a maximum adsorption capacity of 570 mg g−1 and excellent stability. Moreover, the COF maintains high selectivity for ReO4− even in the presence of competing anions such as SO42− and NO3−. These findings highlight that the hydrothermal synthesis is an effective method to synthesize COF adsorbents for efficient removal of 99TcO4− and offers a sustainable approach for practical applications.
Original language | English |
---|---|
Pages (from-to) | 214-219 |
Number of pages | 6 |
Journal | Journal of Materials Chemistry A |
Volume | 13 |
Issue number | 1 |
Early online date | 2024 |
DOIs | |
Publication status | Published - 5 Nov 2024 |
Austrian Fields of Science 2012
- 205019 Material sciences
- 104011 Materials chemistry
- 207111 Environmental engineering