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Enrichment of uranium from wastewater with nanoscale zero-valent iron (nZVI)
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-1-20 , DOI: 10.1039/d0en01029d Yilong Hua 1, 2, 3, 4, 5 , Wei Wang 4, 5, 6, 7, 8 , Nan Hu 1, 2, 3, 4 , Tianhang Gu 4, 5, 6, 7, 8 , Lan Ling 4, 5, 6, 7, 8 , Wei-xian Zhang 4, 5, 6, 7, 8
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2021-1-20 , DOI: 10.1039/d0en01029d Yilong Hua 1, 2, 3, 4, 5 , Wei Wang 4, 5, 6, 7, 8 , Nan Hu 1, 2, 3, 4 , Tianhang Gu 4, 5, 6, 7, 8 , Lan Ling 4, 5, 6, 7, 8 , Wei-xian Zhang 4, 5, 6, 7, 8
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The core–shell structure of nanoscale zero-valent iron (nZVI) offers multiplex solution and surface chemistry for reliable and high-efficiency enrichment and separation of uranium from low-level sources such as wastewater, groundwater, and even seawater. In this work, the reduction, enrichment and separation of uranium from uranium-tailings wastewater were demonstrated in continuous-flow reactors. Specifically, a two-stage continuous flow stirred tank reactor system was operated for 193 h. 497.7 L of radioactive uranium-tailings wastewater containing ∼331 μg U per L was treated with a total of 60.22 g of iron nanoparticles. It produced reacted nZVI containing ∼0.19 wt% uranium, well above typical high-grade uranium ores. The treated wastewater had an average concentration of just 1.47 μg U per L. High-resolution elemental mappings performed with aberration corrected scanning transmission electron microscopy (Cs-STEM) indicated that uranium was deposited largely in the core area of the reacted nZVI particles with chemical reduction as the principal enrichment mechanism. Together with our previous work on nZVI, this further offers growing evidence of a cost-effective nanotechnology for simultaneous pollution control and resource recovery.
中文翻译：
纳米零价铁（nZVI）从废水中富集铀
纳米级零价铁（nZVI）的核-壳结构提供了多种解决方案和表面化学作用，可实现可靠，高效的富集和从低水平来源（如废水，地下水，甚至海水）中分离铀。在这项工作中，在连续流反应器中证明了铀从尾矿废水中的还原，富集和分离。具体而言，两阶段连续流搅拌釜反应器系统运行193小时。每升含约331μgU的497.7 L放射性铀尾矿废水经共60.22 g铁纳米颗粒处理。它产生的反应的nZVI含〜0.19 wt％铀，远高于典型的高品位铀矿石。经处理的废水的平均浓度仅为每L 1.47μgU。用像差校正扫描透射电子显微镜（Cs-STEM）进行的高分辨率元素图谱分析表明，铀主要沉积在反应后的nZVI粒子的核心区域，化学还原是其主要富集机制。加上我们先前在nZVI方面的工作，这进一步提供了越来越高的证据，证明了同时进行污染控制和资源回收的具有成本效益的纳米技术。
更新日期：2021-02-04
中文翻译：
纳米零价铁（nZVI）从废水中富集铀
纳米级零价铁（nZVI）的核-壳结构提供了多种解决方案和表面化学作用，可实现可靠，高效的富集和从低水平来源（如废水，地下水，甚至海水）中分离铀。在这项工作中，在连续流反应器中证明了铀从尾矿废水中的还原，富集和分离。具体而言，两阶段连续流搅拌釜反应器系统运行193小时。每升含约331μgU的497.7 L放射性铀尾矿废水经共60.22 g铁纳米颗粒处理。它产生的反应的nZVI含〜0.19 wt％铀，远高于典型的高品位铀矿石。经处理的废水的平均浓度仅为每L 1.47μgU。用像差校正扫描透射电子显微镜（Cs-STEM）进行的高分辨率元素图谱分析表明，铀主要沉积在反应后的nZVI粒子的核心区域，化学还原是其主要富集机制。加上我们先前在nZVI方面的工作，这进一步提供了越来越高的证据，证明了同时进行污染控制和资源回收的具有成本效益的纳米技术。
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