| 杨千语,王慧珍,李冬涵,刘清,滑熠龙.硫化纳米零价铁去除水溶液中铀的机理[J].南华大学学报(自然科学版),2021,(3):24~29, 50.[YANG Qianyu,WANG Huizhen,LI Donghan,LIU Qing,HUA Yilong.Mechanisms for U(VI) Removal by Sulfidized Nanoscale Zero-Valent Iron[J].Journal of University of South China(Science and Technology),2021,(3):24~29, 50.] |
| 硫化纳米零价铁去除水溶液中铀的机理 |
| Mechanisms for U(VI) Removal by Sulfidized Nanoscale Zero-Valent Iron |
| 投稿时间：2021-01-09 |
| DOI： |
| 中文关键词: 硫化纳米零价铁 铀 动力学 碳酸氢根 |
| 英文关键词:sulfidated nanoscale zero-valent iron uranium kinetics Bicarbonate |
| 基金项目:湖南省自然科学基金青年基金项目(2020JJ5489)；湖南省教育厅科学研究项目一般项目(18C0432) |
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| 中文摘要: |
| 研究了铀溶液初始pH、HCO－3质量浓度和硫化纳米零价铁(sulfidized nano-scale zerovalent iron,SnZVI)投加量对SnZVI去除铀的动力学过程的影响,并通过SEM、XRD和XPS阐明SnZVI去除铀的机理。球形SnZVI颗粒直径为100~200 nm,比表面积为43.5 m2/g。SnZVI颗粒中含有Fe和FeS,且Fe(0)和Fe(Ⅱ)含量超过80%。SnZVI去除铀的动力学过程符合准一级动力学模型。增加SnZVI投加量,反应后溶液中铀质量浓度低于0.05 mg/L,但是pH升高及HCO－3质量浓度增加导致SnZVI去除铀的速率降低。SnZVI去除铀的负荷达到2 452.92 mg/g,且反应后颗粒中约85%的铀为U(IV)和U(V)。研究结果表明,SnZVI可通过表面官能团的吸附作用及Fe(0)的还原作用快速分离水溶液中的铀。 |
| 英文摘要: |
| This paper investigated the effects of solution pH, bicarbonate and SnZVI (sulfidized nano-scale zerovalent iron, SnZVI)dose on uranium separation kinetics with SnZVI, and clarified uranium removal mechanisms with SEM, XRD and XPS. The size of a single spherical SnZVI particle was in the range of 100－200 nm, and the BET surface area was 43.5 m2/g. For the fresh SnZVI, the crystalline iron phase were Fe and FeS, and the content of Fe(0) and Fe(Ⅱ) in the surface of SnZVI exceeded 80%. The pseudo-first-order kinetic model could be used to analyze uranium separation processes. Uranium removal kinetics increased as SnZVI dose increased and the equilibrium uranium concentration was lower than 0.05 mg/L. However, high pH or bicarbonate concentration exhibits a negative effect on uranium separation kinetics. The uranium separation capacity was 2 452.92 mg/g, and more than 85% of surface sorbed U(VI) was reduced to U(VI) and/or U(V). These results demonstrated that uranium could be sorbed by the surface functional groups quickly, and then reduced to its low valent states. |
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