The reductive immobilization of aqueous Se(IV) by natural pyrrhotite
文献类型：期刊论文
| 作者 | Ma, Bin1; Kang, Mingliang1,2,3; Zheng, Zhong1; Chen, Fanrong3; Xie, Jinglin1; Charlet, Laurent4; Liu, Chunli1 |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2014-07-15 |
| 卷号 | 276页码:422-432 |
| 关键词 | Nuclear Waste Disposal Selenite Pyrrhotite Reductive Immobilization Kinetics |
| ISSN号 | 0304-3894 |
| DOI | 10.1016/j.jhazmat.2014.05.066 |
| 英文摘要 | The interaction of Se(IV) with natural pyrrhotite was investigated at pH conditions ranging from acidic to nearly neutral. The results indicate that the reduction rate can be described in terms of a pseudo-first order reaction. At pH similar to 4.0 to similar to 5.0, the rate decreased with increasing pH. Unexpectedly, at pH similar to 5.0, the rate increased with increasing reaction time. This response was also observed at pH similar to 6.0. Two different reaction mechanisms were proposed to explain pyrrhotite oxidation by Se(IV). Because pyrrhotite is acid-soluble and can be attacked by both Fe3+ and protons, direct reduction by the released aqueous sulfide dominates the reaction at low pH, whereas the cyclic oxidation of aqueous Fe2+ adsorbed on pyrrhotite surfaces becomes predominant at high pH. Phosphate, which can be irreversibly bound to Fe3+ intermediates even under acidic conditions, can significantly decrease the reaction rate by an order of magnitude at pH similar to 4.5. In contrast to the thermodynamic calculations and the predicted prevalence of FeSe based on previous reports of aqueous Se(IV) reduction by synthetic mackinawite or troilite, only Se(0) was observed as the reaction product in this study. This observation confirmed that a slow reaction favors the formation of Se(0) rather than iron selenides. (C) 2014 Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000339692700051 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/50461]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Kang, Mingliang |
| 作者单位 | 1.Peking Univ, Beijing Natl Lab Mol Sci, Fundamental Sci Lab Radiochem & Radiat Chem, Coll Chem & Mol Engn, Beijing 100871, Peoples R China 2.Sun Yat Sen Univ, Sino French 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, ISTerre, Environm Geochem Grp, F-38041 Grenoble, France |
| 推荐引用方式 GB/T 7714 | Ma, Bin,Kang, Mingliang,Zheng, Zhong,et al. The reductive immobilization of aqueous Se(IV) by natural pyrrhotite[J]. JOURNAL OF HAZARDOUS MATERIALS,2014,276:422-432. |
| APA | Ma, Bin.,Kang, Mingliang.,Zheng, Zhong.,Chen, Fanrong.,Xie, Jinglin.,...&Liu, Chunli.(2014).The reductive immobilization of aqueous Se(IV) by natural pyrrhotite.JOURNAL OF HAZARDOUS MATERIALS,276,422-432. |
| MLA | Ma, Bin,et al."The reductive immobilization of aqueous Se(IV) by natural pyrrhotite".JOURNAL OF HAZARDOUS MATERIALS 276(2014):422-432. |
入库方式： OAI收割
来源：化学研究所
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