Uranium speciation in coal bottom ash investigated via X-ray absorption fine structure and X-ray photoelectron spectra
文献类型：期刊论文
| ; | |
| 作者 | Sun, Yinglong; Wu, Menxin; Zheng LR(郑黎荣) ; Zheng, Lirong; Wang, Bangda; Wang, Yi
|
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 ; JOURNAL OF ENVIRONMENTAL SCIENCES
|
| 出版日期 | 2018 ; 2018 |
| 卷号 | 74页码:88-94 |
| 关键词 | Coal bottom ash Coal bottom ash Uranium speciation XAFS Uranium migration Uranium speciation XAFS Uranium migration |
| ISSN号 | 1001-0742 ; 1001-0742 |
| DOI | 10.1016/j.jes.2018.02.011 ; 10.1016/j.jes.2018.02.011 |
| 文献子类 | Article ; Article |
| 英文摘要 | Similar to chromium contamination, the environmental contamination caused by uranium in radioactive coal bottom ash (CBA) is primarily dependent on the chemical speciation of uranium. However, the relationship between uranium speciation and environmental contamination has not been adequately studied. To determine the relationship between uranium speciation and environmental contamination, X-ray absorption fine structure (XAFS) and X-ray photoelectron spectra (XPS) analyses were performed to determine the uranium speciation in CBA exposed to different chemical environments and simulated natural environments. The leachability of the different forms of uranium in the CBA was studied via a simulated acid rain leaching experiment, and the results showed that 57.0% of the total uranium was leached out as U(VI). The results of a linear combination fit (LCF) of the X-ray absorption near edge structure (XANES) spectrum revealed that in the raw CBA, the uranium mainly occurred as U3O8 (71.8%). However, in the iron-rich particles, the uranium mainly occurred as UO2 (91.9%) after magnetic separation. Magnetite is a ubiquitous ferrous-bearing oxide, and it was effective for the sorption of U(IV). The result of FeSO4 leaching experiment indicated that 96.57% of total uranium was reduced from U(VI) to U(IV) when infiltrated with the FeSO4 solution for 6 months. This result clearly demonstrated the changes in chemical valence of uranium in the coal ash and provided a conceptual principle for preventing uranium migration from ash to the surrounding soil and plants. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.; Similar to chromium contamination, the environmental contamination caused by uranium in radioactive coal bottom ash (CBA) is primarily dependent on the chemical speciation of uranium. However, the relationship between uranium speciation and environmental contamination has not been adequately studied. To determine the relationship between uranium speciation and environmental contamination, X-ray absorption fine structure (XAFS) and X-ray photoelectron spectra (XPS) analyses were performed to determine the uranium speciation in CBA exposed to different chemical environments and simulated natural environments. The leachability of the different forms of uranium in the CBA was studied via a simulated acid rain leaching experiment, and the results showed that 57.0% of the total uranium was leached out as U(VI). The results of a linear combination fit (LCF) of the X-ray absorption near edge structure (XANES) spectrum revealed that in the raw CBA, the uranium mainly occurred as U3O8 (71.8%). However, in the iron-rich particles, the uranium mainly occurred as UO2 (91.9%) after magnetic separation. Magnetite is a ubiquitous ferrous-bearing oxide, and it was effective for the sorption of U(IV). The result of FeSO4 leaching experiment indicated that 96.57% of total uranium was reduced from U(VI) to U(IV) when infiltrated with the FeSO4 solution for 6 months. This result clearly demonstrated the changes in chemical valence of uranium in the coal ash and provided a conceptual principle for preventing uranium migration from ash to the surrounding soil and plants. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 电子版国际标准刊号 | 1878-7320 ; 1878-7320 |
| WOS关键词 | U(VI) SORPTION ; U(VI) SORPTION ; REDUCTION ; COMPLEXES ; IRON ; COPPER ; RADIOACTIVITY ; KINETICS ; ELEMENTS ; OXIDES ; URANYL ; REDUCTION ; COMPLEXES ; IRON ; COPPER ; RADIOACTIVITY ; KINETICS ; ELEMENTS ; OXIDES ; URANYL |
| WOS研究方向 | Chemistry ; Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics ; Science & Technology - Other Topics ; Materials Science ; Physics |
| 语种 | 英语 ; 英语 |
| CSCD记录号 | CSCD:6370522 ; CSCD:6370522 |
| WOS记录号 | WOS:000456879900009 ; WOS:000456879900009 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286607]  |
| 专题 | 高能物理研究所_多学科研究中心 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Sun, Yinglong,Wu, Menxin,Zheng LR,et al. Uranium speciation in coal bottom ash investigated via X-ray absorption fine structure and X-ray photoelectron spectra, Uranium speciation in coal bottom ash investigated via X-ray absorption fine structure and X-ray photoelectron spectra[J]. JOURNAL OF ENVIRONMENTAL SCIENCES, JOURNAL OF ENVIRONMENTAL SCIENCES,2018, 2018,74, 74:88-94, 88-94. |
| APA | Sun, Yinglong,Wu, Menxin,郑黎荣,Zheng, Lirong,Wang, Bangda,&Wang, Yi.(2018).Uranium speciation in coal bottom ash investigated via X-ray absorption fine structure and X-ray photoelectron spectra.JOURNAL OF ENVIRONMENTAL SCIENCES,74,88-94. |
| MLA | Sun, Yinglong,et al."Uranium speciation in coal bottom ash investigated via X-ray absorption fine structure and X-ray photoelectron spectra".JOURNAL OF ENVIRONMENTAL SCIENCES 74(2018):88-94. |
入库方式： OAI收割
来源：高能物理研究所
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