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Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides
Xu, L; Zheng, T; Yang, ST; Zhang, LJ; Wang, JQ; Liu, W; Chen, LH; Juan, DW; Chai, ZF; Wang, S; Wang, S (reprint author), Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, Suzhou 215123, Peoples R China.; Wang, S (reprint author), Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China.
2016
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume50Issue:7Pages:3852—3859
Subtype期刊文献
AbstractThe 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.
KeywordGroundwater Remediation Aqueous-solutions Metal Removal Sorption Phosphate Exafs Dissolution Americium Batch Acid
DOI10.1021/acs.est.5b05932
Indexed BySCI
Language英语
WOS IDWOS:000373655800065
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25888
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorYang, ST; Wang, S (reprint author), Soochow Univ, Sch Radiol & Interdisciplinary Sci RAD X, Suzhou 215123, Peoples R China.; Wang, S (reprint author), Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China.
Recommended Citation
GB/T 7714
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,2016,50(7):3852—3859.
APA Xu, L.,Zheng, T.,Yang, ST.,Zhang, LJ.,Wang, JQ.,...&Wang, S .(2016).Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides.ENVIRONMENTAL SCIENCE & TECHNOLOGY,50(7),3852—3859.
MLA Xu, L,et al."Uptake Mechanisms of Eu(III) on Hydroxyapatite: A Potential Permeable Reactive Barrier Backfill Material for Trapping Trivalent Minor Actinides".ENVIRONMENTAL SCIENCE & TECHNOLOGY 50.7(2016):3852—3859.
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