Authors
Long Li, Yiting Wang, Qiao Yu, Qiaoyin Huang, Die Huang, Songdong Ding
Published in
Inorganic chemistry. Jun 15, 2026. Epub Jun 15, 2026.
Abstract
With the rapid development of nuclear energy, achieving efficient and highly selective separation of TcO4- from acidic nuclear wastewater has become an urgent challenge. In this context, three amine-triamide ligands were selected to investigate the effect of ligand structure on the extraction performance toward TcO4-/ReO4-. Among them, the short-chain ethyl-substituted ligand N,N-diethyl-N',N',N″,N″-tetraoctylnitrilotriacetamide (LI) exhibited superior extractability and selectivity for TcO4-/ReO4- anions in dilute nitric acid solution compared to the long-chain butyl-substituted (LII) and octyl-substituted (LIII), using n-dodecane as the diluent. The study of the relationship between ligand structure and extraction performance revealed that the overall extraction performance of amine-triamide ligands─including loading capacity, extraction efficiency, and selectivity─is governed by a combination of steric hindrance and lipophilicity. Remarkably, even at a NO3-/ReO4- molar ratio as high as 1000:1, ligand LI maintained a DRe value of 3.5 with negligible coextraction of coexisting cations, outperforming most functional adsorbents reported to date. Slope analysis and loading capacity tests indicated the formation of a 1:1 extracted complex between the amine-triamide ligand and TcO4-/ReO4-. Furthermore, characterization by electrospray ionization mass spectrometry (ESI-MS), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) confirmed that the extraction proceeds via an anion-exchange mechanism.
PMID:
42296486
Bibliographic data and abstract were imported from PubMed on 16 Jun 2026.
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