In:
Angewandte Chemie International Edition, Wiley, Vol. 58, No. 15 ( 2019-04), p. 4968-4972
Abstract:
99 Tc contamination at legacy nuclear sites is a serious and unsolved environmental issue. The selective remediation of 99 TcO 4 − in the presence of a large excess of NO 3 − and SO 4 2− from natural waste systems represents a significant scientific and technical challenge, since anions with a higher charge density are often preferentially sorbed by traditional anion‐exchange materials. We present a solution to this challenge based on a stable cationic metal‐organic framework, SCU‐102 (Ni 2 (tipm) 3 (NO 3 ) 4 ), which exhibits fast sorption kinetics, a large capacity (291 mg g −1 ), a high distribution coefficient, and, most importantly, a record‐high TcO 4 − uptake selectivity. This material can almost quantitatively remove TcO 4 − in the presence of a large excess of NO 3 − and SO 4 2− . Decontamination experiments confirm that SCU‐102 represents the optimal Tc scavenger with the highest reported clean‐up efficiency, while first‐principle simulations reveal that the origin of the selectivity is the recognition of TcO 4 − by the hydrophobic pockets of the structure.
Type of Medium:
Online Resource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.201814640
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
2011836-3
detail.hit.zdb_id:
123227-7
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