Kinetics of FeSe2 oxidation by ferric iron and its reactivity compared with FeS2
文献类型：期刊论文
| 作者 | Ma Bin1; Nie Zhe1; Liu ChunLi1; Kang MingLiang1,2,3; Bardelli, Fabrizio4; Chen FanRong3; Charlet, Laurent4 |
| 刊名 | SCIENCE CHINA-CHEMISTRY
 |
| 出版日期 | 2014-09-01 |
| 卷号 | 57期号:9页码:1300-1309 |
| 关键词 | High-level Radioactive Waste Disposal Ferroselite Oxidative Dissolution Second-order Rate Law |
| ISSN号 | 1674-7291 |
| DOI | 10.1007/s11426-014-5126-7 |
| 英文摘要 | The mobility and bioavailability of selenium is a major health and environmental issue and a main concern for geological disposal of high-level radioactive waste. Chemically and/or microbially mediated oxidation of insoluble Se-bearing particulate, such as iron selenides, to dissolved and mobile phases controls the transport and distribution of Se in the environment. The oxidation of ferroselite (FeSe2) by ferric iron was investigated in anoxic conditions. The redox reaction can be represented by: FeSe2 + 2Fe(3+) = 2Se(0) + 3Fe(2+). Kinetic studies indicated that the reaction can be described by second-order rate law, with rate constants of 0.49 +/- 0.01, 0.85 +/- 0.02, 1.84 +/- 0.04, and 3.29 +/- 0.13 L mol(-1) s(-1) at pH 1.62, 1.87, 2.23, and 2.49, respectively. The positive correlation between reaction rate and pH implies that diffusion of Fe3+ oxidant to the mineral surface is the rate-determining step. The strong reactivity of FeSe2 towards Fe3+ suggests that ferric iron may play a significant role in FeSe2 oxidation process (e.g., by Se4+, O-2, etc.) and Se-0 should be the first reaction product. Also, it was shown that the reduction rate of Fe3+ or Se4+ by pyrite (FeS2) can be significantly increased in the presence of FeSe2, suggesting a stronger reactivity of FeSe2 compared with pyrite. The results obtained extend our knowledge about the subtle interaction between Se, pyrite and iron selenides in the environment, and give insight into the transfer of selenium from iron selenides to bio-available selenium (i.e., selenite and selenate) in the Se-rich environment. |
| 语种 | 英语 |
| WOS记录号 | WOS:000341094200015 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/52853]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Liu ChunLi |
| 作者单位 | 1.Peking Univ, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Fundamental Sci Lab Radiochem & Radiat Chem, Beijing 100871, Peoples R China 2.Sun Yat Sen Univ, Sinofrench Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China 4.Univ Grenoble 1, Environm Geochem Grp, ISTerre, F-38041 Grenoble, France |
| 推荐引用方式 GB/T 7714 | Ma Bin,Nie Zhe,Liu ChunLi,et al. Kinetics of FeSe2 oxidation by ferric iron and its reactivity compared with FeS2[J]. SCIENCE CHINA-CHEMISTRY,2014,57(9):1300-1309. |
| APA | Ma Bin.,Nie Zhe.,Liu ChunLi.,Kang MingLiang.,Bardelli, Fabrizio.,...&Charlet, Laurent.(2014).Kinetics of FeSe2 oxidation by ferric iron and its reactivity compared with FeS2.SCIENCE CHINA-CHEMISTRY,57(9),1300-1309. |
| MLA | Ma Bin,et al."Kinetics of FeSe2 oxidation by ferric iron and its reactivity compared with FeS2".SCIENCE CHINA-CHEMISTRY 57.9(2014):1300-1309. |
入库方式： OAI收割
来源：化学研究所
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