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题名:
Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides
作者: Xu, L; Zheng, T; Yang, ST; Zhang, LJ; Wang, JQ; Liu, W; Chen, LH; Juan, DW; Chai, ZF; Wang, S
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期: 2016
卷号: 50, 期号:7, 页码:3852—3859
关键词: GROUNDWATER REMEDIATION ; AQUEOUS-SOLUTIONS ; METAL REMOVAL ; SORPTION ; PHOSPHATE ; EXAFS ; DISSOLUTION ; AMERICIUM ; BATCH ; ACID
DOI: 10.1021/acs.est.5b05932
通讯作者: Yang, ST ; Wang, S (reprint author), Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, Suzhou 215123, Peoples R China. ; Yang, ST ; Wang, S (reprint author), Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China.
文章类型: 期刊文献
英文摘要: The permeable reactive barrier (PRB) technique has attracted an increasing level of attention for the in situ remediation of contaminated groundwater. In this study, the macroscopic uptake behaviors and microscopic speciation of Eu(III) on hydroxyapatite (HAP) were investigated by a combination of theoretical modeling, batch experiments, powder X-ray diffraction (PXRD) fitting, and X-ray absorption spectroscopy (XAS). The underlying removal mechanisms were identified to further assess the application potential of HAP as an effective PRB backfill material. The macroscopic analysis revealed that nearly all dissolved Eu(III) in solution was removed at pH 6.5 within an extremely short reaction time of 5 min. In addition, the thermodynamic calculations, desorption experiments, and PXRD and XAS analyses definitely confirmed the formation of the EuPO4 center dot H2O(s) phase during the process of uptake of dissolved Eu(III) by HAP via the dissolution precipitation mechanism. A detailed comparison of the present experimental findings and related HAP metal systems suggests that the relative contribution of precipitation to the total Eu(III) removal increases as the P:Eu ratio decreases. The dosage of HAP-based PRB for the remediation of groundwater polluted by Eu(III) and analogous trivalent actinides [e.g., Am(III) and Cm(III)] should be strictly controlled depending on the dissolved Eu(III) concentration to obtain an optimal P:M (M represents Eu, Am, or Cm) ratio and treatment efficiency.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000373655800065
ISSN号: 0013-936X
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25888
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Xu, L,Zheng, T,Yang, ST,et al. Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2016-01-01,50(7):3852—3859.
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