| 钠盐溶液中U(Ⅵ)的电化学电子转移与晶化研究 |
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| 引用本文： | 宗美荣,何辉超,董发勤,何平,孙仕勇,刘明学,聂小琴. 钠盐溶液中U(Ⅵ)的电化学电子转移与晶化研究[J]. 高等学校化学学报, 2016, 37(9): 1701. DOI: 10.7503/cjcu20160171 |
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| 作者姓名： | 宗美荣 何辉超 董发勤 何平 孙仕勇 刘明学 聂小琴 |
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| 作者单位： | 1. 西南科技大学固体废物处理与资源化教育部重点实验室, 绵阳 6210102. 西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地, 绵阳 621010 |
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| 基金项目： | 国家“九七三”计划项目(批准号: 2014CB846003)、 国家自然科学基金(批准号: 41272371)和中国博士后科学基金第59批面上基金(编号: 2016M592698)资助 |
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| 摘 要： | 采用循环伏安法分析钠盐溶液中U(Ⅵ)的电化学行为, 恒电位电化学还原处理U(Ⅵ), 利用交流阻抗谱分析电化学还原反应中的过程动力学特性, 利用X射线衍射、 扫描电子显微镜和电子能谱等方法分析了U(Ⅵ)的电化学晶化. 结果表明, 在钠盐溶液中, U(Ⅵ)可通过电化学反应先还原成低价的U(V)并进一步还原为U(Ⅳ), U(Ⅳ)一步氧化为U(Ⅵ), U(Ⅳ)/U(Ⅵ)之间的电化学转化过程受扩散控制, 且U(Ⅵ)的电化学电子转移易受环境pH值的影响; 恒电位还原4 h时, 溶液中U(Ⅵ)的去除率可达90%, U(Ⅵ)的结晶固化产物主要以固态的(UO2)6O2(OH)8·6H2O(水铀矿) 和UO2的形式附着在工作电极上.
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| 关 键 词： | 铀(Ⅵ) 电化学 电化学阻抗谱 结晶 |
| 收稿时间： | 2016-03-23 |
Electrochemical Electron Transfer and Crystallization Process of Uranium(Ⅵ) in Sodium Salt Solution† |
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| ZONG Meirong,HE Huichao,DONG Faqin,HE Ping,SUN Shiyong,LIU Mingxue,NIE Xiaoqin. Electrochemical Electron Transfer and Crystallization Process of Uranium(Ⅵ) in Sodium Salt Solution†[J]. Chemical Research In Chinese Universities, 2016, 37(9): 1701. DOI: 10.7503/cjcu20160171 |
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| Authors: | ZONG Meirong HE Huichao DONG Faqin HE Ping SUN Shiyong LIU Mingxue NIE Xiaoqin |
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| Affiliation: | 1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southewest University of Science and Technology, Mianyang 621010, China2. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southewest University of Science and Technology, Mianyang 621010, China |
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| Abstract: | Electrochemical beheaviors of uranium(VI) was investigated with cyclic voltammetry and chronoamperometry(CV). The reduction of U(Ⅵ) was analyzed by potentiostatic electrochemical and the kinetics was investigated with electrochemical impedance spectroscopy(EIS). In addition, crystallization of U(Ⅵ) were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy-dispersive spectrometry(EDS). The results indicated that the reduction processes of U(Ⅵ) to U(Ⅳ) was significantly in fluenced by the pH value of solution, with the pH value changed from 3.87 to 4.50, the cyclic voltammetry showed that the reduction of U(Ⅵ) to U(Ⅳ) was in a manner of two-step one-electron process with a diffusion-controlled reaction mechanism. The cyclic voltammetry results presented a constant potential reduction method for removing U(Ⅵ) from aqueous solution, and the reduction efficiency can reach 90%. At a constant potential, U(Ⅵ) mainly crystalized into solid phases in the forms of UO2 and (UO2)6O2(OH)8·6H2O. These results could provide a basis for removing and collecting U(Ⅵ) from solution. |
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| Keywords: | Uranium(Ⅵ) Electrochemistry Electrochemical impedance spectroscopy Crystallization |
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