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Anion-adaptive crystalline cationic material for 99TcO4- trapping.

  • Author(s): Mei, Lei;
  • Li, Fei-Ze;
  • Li, Fei-Ze;
  • Lan, Jian-Hui;
  • Wang, Cong-Zhi;
  • Xu, Chao;
  • Deng, Hao;
  • Wu, Qun-Yan;
  • Hu, Kong-Qiu;
  • Wang, Lin;
  • Chai, Zhi-Fang;
  • Chen, Jing;
  • Gibson, John K;
  • Shi, Wei-Qun
  • et al.
Abstract

Efficient anion recognition is of great significance for radioactive 99TcO4- decontamination, but it remains a challenge for traditional sorbents. Herein, we put forward a tactic using soft crystalline cationic material with anion-adaptive dynamics for 99TcO4- sequestration. A cucurbit[8]uril-based supramolecular metal-organic material is produced through a multi-component assembly strategy and used as a sorbent for effective trapping of TcO4-. Excellent separation of TcO4-/ReO4- is demonstrated by fast removal kinetics, good sorption capacity and high distribution coefficient. Remarkably, the most superior selectivity among metal-organic materials reported so far, together with good hydrolytic stability, indicates potential for efficient TcO4- removal. The structure incorporating ReO4- reveals that the supramolecular framework undergoes adaptive reconstruction facilitating the effective accommodation of TcO4-/ReO4-. The results highlight opportunities for development of soft anion-adaptive sorbents for highly selective anion decontamination.

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