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题名: Surface complexation modeling of Eu(III) and phosphate on Na-bentonite: Binary and ternary adsorption systems
作者: Chen, ZY(陈宗元); Jin, Q; Guo, ZJ(郭治军); Montavon, G; Wu, WS(吴王锁)
收录类别: SCIE ; EI ; BIOSIS
出版日期: 2014-11-15
刊名: CHEMICAL ENGINEERING JOURNAL
卷号: 256, 页码:61-68
出版者: ELSEVIER
出版地: LAUSANNE
英文摘要: This study aims to investigate and model the adsorption of Eu(III) on bentonite in the presence of phosphate. Binary (phosphate/bentonite) and ternary (Eu(III)/phosphate/bentonite) systems were studied as a function of contact time, pH, solid-to-liquid ratio and Eu(III)/phosphate concentration by using a batch experimental method. The adsorption of phosphate on bentonite slightly increased in the pH range of 2.5-6.5, and decreased in the pH range of 6.5-9.4. This adsorption can be quantitatively interpreted by a model considering the formation of three monodentate surface complexes. In the ternary system, a synergistic adsorption was observed in the presence of both phosphate and Eu(III). In addition to the two sub-models describing Eu(III) and phosphate adsorption, the formation of ternary surface complexes had to be considered in order to explain the synergistic effect experimentally observed. The experimental data could be quantitatively explained when Eu(III) ( SOEuH2PO4+ and SOEuHPO4) or phosphate ( SPO4Eu+) are the bridged atoms. Complementary experiments carried out by X-ray photoelectron spectroscopy suggested that the second case is the most probable. The proposed model can be used in order to predict Eu(III) adsorption on buffer/backfilling material in the presence of phosphate. (C) 2014 Elsevier B.V. All rights reserved.
关键词: Eu(III) ; Phosphate ; Bentonite ; Adsorption ; Surface complexation model
作者部门: [Chen, Zongyuan ; Jin, Qiang ; Guo, Zhijun ; Wu, Wangsuo] Lanzhou Univ, Sch Nucl Sci & Technol, Radiochem Lab, Lanzhou 730000, Peoples R China ; [Chen, Zongyuan ; Montavon, Gilles] Ecole Mines, UMR 6457 CNRS IN2P3, Lab SUBATECH, PRES UNAM, F-44307 Nantes, France
通讯作者: Guo, ZJ (reprint author), Lanzhou Univ, Sch Nucl Sci & Technol, Radiochem Lab, Lanzhou 730000, Peoples R China.
学科分类: Engineering
文章类型: Article
所属项目编号: National Natural Science Foundation of China [91226113, J1210001]
所属项目名称: 国家自然科学基金项目
项目资助者: NSFC
语种: 英语
DOI: 10.1016/j.cej.2014.06.096
ISSN号: 1385-8947
WOS记录号: WOS:000341558400008
EI记录号: 20143017976683
BIOSIS记录号: BIOSIS:PREV201400699356
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/117379
Appears in Collections:核科学与技术学院_期刊论文

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Recommended Citation:
Chen, ZY,Jin, Q,Guo, ZJ,et al. Surface complexation modeling of Eu(III) and phosphate on Na-bentonite: Binary and ternary adsorption systems[J]. CHEMICAL ENGINEERING JOURNAL,2014,256:61-68.
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