Extracting uranium (U(VI)) from fluoride-rich radioactive wastewater is of great significance for the development of nuclear energy and environmental remediation. The presence of thermodynamically stable [UO2Fn]2−n (n = 0, 1, 2, 3, 4) aqueous complexes in fluoride-rich U(VI)-containing wastewater significantly hinders the efficiency of uranyl extraction and recovery using conventional methods. In this study, we report a direct precipitation method using deferiprone ligands for efficient uranyl extraction from fluoride-rich wastewater that offsets the preparation of solid materials. The deferiprone ligands exhibited exceptional chelating ability competing toward F−. In simulated 2.1 × 10–4 mol/L U(VI) wastewater with F− concentrations ranging from 1 to 10 g/L, adjusting the amount of deferiprone ligands enabled a high U(Ⅵ) precipitation rate of 97.60 % to 86.90 %, correspondingly. A remarkable 99.71 % recovery of U(Ⅵ) from real fluoride-rich alkaline wastewater was achieved within 2 h. Detailed investigations revealed that the competitive chelating by deferiprone ligands results in the formation of insoluble U(VI)-deferiprone complexes ([(UO2)(H2O)(C7NO2H8)2]·4H2O), driven by π-π stacking interactions, electrostatic attractions, and intermolecular hydrogen bonds. Given the cost-efficiency and excellent radiation resistance of deferiprone ligands, this efficient and straightforward precipitation approach holds great promise for practical applications in U(VI) remediation and resource recovery from fluoride-rich wastewater.

中文翻译：

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通过去铁酮配体络合从含氟废水中高效回收铀 （VI）


从富氟放射性废水中提取铀 （U（VI）） 对核能开发和环境修复具有重要意义。在富含氟化物的 U（VI） 废水中存在热力学稳定的 [UO2Fn]2−n （n = 0， 1， 2， 3， 4） 水复合物，这严重阻碍了使用传统方法提取和回收铀酰的效率。在这项研究中，我们报道了一种使用去铁酮配体的直接沉淀方法，用于从富含氟化物的废水中高效提取铀酰，从而抵消了固体材料的制备。去铁酮配体表现出对 F- 的异常螯合能力。在模拟的 2.1 × 10–4 mol/L U（VI） 废水中，F− 浓度为 1 至 10 g/L，调整去铁酮配体的量可相应地实现 97.60 % 至 86.90 % 的高 U（VI.） 沉淀率。在 2 小时内，从真正富含氟化物的碱性废水中实现了 99.71% 的 U（VI.） 回收率。详细研究表明，去铁酮配体的竞争性螯合导致不溶性 U（VI）-去铁酮复合物 （[（UO2）（H2O）（C7NO2H8）2]·4H2O），由 π-π 堆积相互作用、静电吸引力和分子间氢键驱动。鉴于去铁酮配体的成本效益和出色的抗辐射性，这种高效而直接的沉淀方法在铀（VI） 修复和从富含氟化物的废水中回收资源方面具有很大的前景。