Determination of the Redox Potentials of Solution and Solid Surface of Fe(II) Associated with Iron Oxyhydroxides
文献类型：期刊论文
| 作者 | Li, Xiaomin3,4; Liu, Liang1,4; Wu, Yundang2; Liu, Tongxu2,4 |
| 刊名 | ACS Earth and Space Chemistry
 |
| 出版日期 | 2019 |
| 卷号 | 3期号:5页码:711-717 |
| DOI | 10.1021/acsearthspacechem.9b00001 |
| 英文摘要 | While the redox properties of Fe(II) associated with iron minerals have been widely investigated given their significance in controlling the biogeochemical processes of elements and contaminants, a robust link between the experimental measurements and theoretical calculations of redox potentials (Eh) of Fe(II)-associated iron minerals is still lacking. In this study, the experimental and calculated Eh values of Fe(II) species in solution with ferrihydrite (Fhy) were investigated. Eh of the bulk system of Fe(II) and ferrihydrite [Fe(II)-Fhy] and Eh of Fe(II) associated with ferrihydrite [Fhy-associated Fe(II)] were examined by open circuit potential (OCP) and cyclic voltammetry (CV) measurements, respectively, both of which were also calculated on the basis of the modified Nernst equation. Both the experimental Eh values of bulk Fe(II)-Fhy obtained from the OCP measurements and the Eh values calculated for solution-phase Fe(II) decreased substantially with increasing Fe(II) concentrations, indicating that the redox potentials of bulk Fe(II)-associated with iron oxyhydroxides (Fe(II)-IOs) were determined by solution-phase Fe(II). The Eh values of bulk Fe(II)-IOs obtained from the OCP measurements for Fe(II)-Fhy were close to those of Fe(II)-Gth, and this finding was attributed to the Fe(II)-catalyzed transformation of ferrihydrite to goethite. The Eh values of surface-sorbed Fe(II) obtained from CV tests and the calculation for Fe(II)-Fhy were close to those of Fe(II)-Gth, implying that the redox potentials of surface-sorbed Fe(II) were determined by the redox couple of sorbed Fe(II) and freshly formed Fe(III) but not structural Fe(III); therefore, newly formed Fe(III) was more reactive than structural Fe(III). The anthraquinone-2,6-disulfonate (AQDS) reduction experiments revealed that, while 77.1-82.9% of AQDS could be reduced in the suspensions of Fe(II)-Fhy and Fe(II)-Gth, Fe2+ in solution without any iron oxides only reduced 9.1% of AQDS. By integration of electrochemical measurements and theoretical calculation, this study demonstrated that the redox couple of sorbed Fe(II) and freshly formed Fe(III) dominated the surface reactivity in the Fe(II)-associated iron minerals, which provides new insight into the redox properties of the Fe(II)-iron mineral system. © 2019 American Chemical Society. |
| 电子版国际标准刊号 | 24723452 |
| 语种 | 英语 |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/9831]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 作者单位 | 1.Green Intelligence Environmental School, Yangtze Normal University, Chongqing; 408100, China; 2.Guangzhou Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-environmental Science and Technology, Guangzhou, Guangdong; 510650, China; 3.SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, Ministry of Education (MOE), Key Laboratory of Environmental Theoretical Chemistry, South China Normal University (SCNU), Guangzhou, Guangdong; 510006, China; 4.School of Civil and Environmental Engineering, University of New South Wales, Sydney; NSW; 2052, Australia |
| 推荐引用方式 GB/T 7714 | Li, Xiaomin,Liu, Liang,Wu, Yundang,et al. Determination of the Redox Potentials of Solution and Solid Surface of Fe(II) Associated with Iron Oxyhydroxides[J]. ACS Earth and Space Chemistry,2019,3(5):711-717. |
| APA | Li, Xiaomin,Liu, Liang,Wu, Yundang,&Liu, Tongxu.(2019).Determination of the Redox Potentials of Solution and Solid Surface of Fe(II) Associated with Iron Oxyhydroxides.ACS Earth and Space Chemistry,3(5),711-717. |
| MLA | Li, Xiaomin,et al."Determination of the Redox Potentials of Solution and Solid Surface of Fe(II) Associated with Iron Oxyhydroxides".ACS Earth and Space Chemistry 3.5(2019):711-717. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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