当前位置：
X-MOL 学术
›
ACS Earth Space Chem.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Retention of U(VI) by the Formation of Fe Precipitates from Oxidation of Fe(II)
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-08-07 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00055 Huiyang Mei 1, 2 , Xiaoli Tan 1, 2 , Liqiang Tan 1 , Yuedong Meng 2 , Changlun Chen 2 , Ming Fang 1 , Xiangke Wang 1, 3
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-08-07 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00055 Huiyang Mei 1, 2 , Xiaoli Tan 1, 2 , Liqiang Tan 1 , Yuedong Meng 2 , Changlun Chen 2 , Ming Fang 1 , Xiangke Wang 1, 3
Affiliation
|
The fate of radionuclide contaminants can be strongly affected by the Fe(II) oxidation process at natural redox boundaries because the formative Fe precipitates may serve as scavengers for radionuclides. In this regard, we investigated the retention efficiency of U(VI) by the formative Fe precipitates in dilute FeCl2 solutions under mild oxidative conditions. The formed precipitates were characterized using spectroscopic methods. The results identified that the presence of U(VI) facilitated the formation of Fe precipitates as lepidocrocite. The high retention efficiency of U(VI) through co-precipitated reaction is ascribed to the synergetic effect of incorporation and adsorption processes. The successive acid-washing experiments, energy-dispersive X-ray spectra, and excitation–emission matrix spectra revealed that adsorbed U was washed off, while incorporated U was still in the precipitates. As a redox-active trace element, U incorporated into the solids could be in the state of U(V) or U(VI) as analyzed from X-ray photoelectron spectroscopy. These results may be of value in evaluating the potential of permanent retention of a trace element through redox and precipitation of iron oxides.
中文翻译：
通过Fe（II）的氧化形成Fe沉淀来保留U（VI）
天然氧化还原边界处的Fe（II）氧化过程会严重影响放射性核素污染物的命运，因为形成性的Fe沉淀物可能充当放射性核素的清除剂。在这方面，我们研究了在稀FeCl 2中形成的Fe沉淀物对U（VI）的保留效率。溶液在温和的氧化条件下。使用光谱法表征形成的沉淀物。结果表明，U（VI）的存在促进了铁沉淀物的形成，如铁水云母。通过共沉淀反应，U（VI）的高保留效率归因于掺入和吸附过程的协同作用。连续的酸洗实验，能量色散X射线光谱和激发发射矩阵光谱表明，吸附的U被冲走，而掺入的U仍在沉淀物中。作为氧化还原活性痕量元素，从X射线光电子能谱分析，掺入固体中的U可能处于U（V）或U（VI）的状态。
更新日期：2018-08-07
中文翻译：
通过Fe（II）的氧化形成Fe沉淀来保留U（VI）
天然氧化还原边界处的Fe（II）氧化过程会严重影响放射性核素污染物的命运，因为形成性的Fe沉淀物可能充当放射性核素的清除剂。在这方面，我们研究了在稀FeCl 2中形成的Fe沉淀物对U（VI）的保留效率。溶液在温和的氧化条件下。使用光谱法表征形成的沉淀物。结果表明，U（VI）的存在促进了铁沉淀物的形成，如铁水云母。通过共沉淀反应，U（VI）的高保留效率归因于掺入和吸附过程的协同作用。连续的酸洗实验，能量色散X射线光谱和激发发射矩阵光谱表明，吸附的U被冲走，而掺入的U仍在沉淀物中。作为氧化还原活性痕量元素，从X射线光电子能谱分析，掺入固体中的U可能处于U（V）或U（VI）的状态。
京公网安备 11010802027423号