Design, Synthesis, and Characterization of a Bifunctional Chelator with Ultrahigh Capacity for Uranium Uptake from Seawater Simulant

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• 作者：Marek Piechowicz ; Carter W. Abney ; Xin Zhou ; Nathan C. Thacker ; Zhong Li ; Wenbin Lin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：55
• 期：15
• 页码：4170-4178
• 全文大小：491K
• 年卷期：0
• ISSN：1520-5045

文摘

Informed by density functional theory calculations, a novel bifunctional chelator, (Z)-2-[2-(N′-hydroxycarbamimidoyl)phenoxy]benzoic acid, was designed and synthesized for ultrahigh uranium uptake from seawater. Investigation of the ligand for uranium sorption was conducted in artificial seawater (pH = 8.2). An exceptional uranium uptake of 553 mg of uranium (g of sorbent)⁻¹ was obtained with a theoretical saturation capacity of 710 mg g^–1 obtained by fitting isotherm data with the Langmuir–Freundlich model. The resulting yellow precipitate was characterized via X-ray absorption fine structure (XAFS) at the U L_III-edge, with the extended XAFS spectra best fitted by a model where uranyl is coordinated by monodentate amidoxime, one chelating carboxylic acid, and two water molecules. These results are consistent with the formation of a uranium coordination polymer. The ultrahigh uranium uptake capacity obtained by the bifunctional chelating ligand makes it a promising candidate for deployment as a uranium adsorbent.