Gram-scale green synthesis of a highly stable cationic covalent organic framework for efficient and selective removal of ReO4/99TcO4

Changxia Li (Corresponding author), Justyna Florek, Patrick Guggenberger, Freddy Kleitz (Corresponding author)

Publications: Contribution to journalArticlePeer Reviewed

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 languageEnglish
Pages (from-to)214-219
Number of pages6
JournalJournal of Materials Chemistry A
Volume13
Issue number1
Early online date2024
DOIs
Publication statusPublished - 5 Nov 2024

Austrian Fields of Science 2012

  • 205019 Material sciences
  • 104011 Materials chemistry
  • 207111 Environmental engineering

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