Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: EXAFS study and surface complexation modeling
文献类型：期刊论文
| 作者 | Dou, XM; Zhang, Y; Zhao, B; Wu, XM; Wu, ZY; Yang, M; Wu ZY(吴自玉)
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| 刊名 | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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| 出版日期 | 2011 |
| 卷号 | 379期号:1-3 SI页码:#REF! |
| 关键词 | Arsenate Adsorption Fe-Ce bimetal oxide Surface complexes EXAFS CD-MUSIC model |
| 通讯作者 | Zhang, Y (reprint author), Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China. |
| 英文摘要 | The mechanism of arsenate (As(V)) adsorption on an Fe-Ce bimetal (hydrous) oxide (Fe-Ce) was investigated using complementary analysis techniques including extended X-ray absorption fine structure (EXAFS) and surface complexation modeling. The As K-edge EXAFS spectra showed that the second peak of Fe-Ce after As(V) adsorption was the As-Fe shell, which supported the finding that As(V) adsorption occurred mainly at the Fe surface active sites. Two As-Fe distances of 3.30 angstrom and 3.55 angstrom were observed from the EXAFS spectra of As(V) adsorbed samples at three pH levels (5.0, 7.6, and 9.0) and two initial surface loadings of 70 and 130 mg/g, which indicated that monodentate mononuclear and bidentate binuclear As surface complexes coexisted. When compared with the reported dominant species of bidentate binuclear complex for As existing on iron (hydro)oxides, the existence of Ce atoms in the bimetal oxide and the high surface loading were the likely reasons for the existence of the monodentate complex. A Charge Distribution-Multi-site Sites Complexation (CD-MUSIC) model showed that protonated monodentate (MH) and deprotonated bidentate (B) complexes preferred to exist on the Fe-Ce surface in a high surface loading range (Gamma = 5.11-14.4 mu mol/m(2)). The MH complex was shown to be dominant at pH < 8. Based on the results from EXAFS analysis and the CD-MUSIC model, the adsorptive behavior of As(V) on Fe-Ce with high surface loadings was satisfactorily interpreted and understood. (C) 2010 Elsevier B.V. All rights reserved. |
| 学科主题 | Chemistry |
| 类目[WOS] | Chemistry, Physical |
| 收录类别 | SCI |
| WOS记录号 | WOS:000289920200017 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/226212]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 推荐引用方式 GB/T 7714 | Dou, XM,Zhang, Y,Zhao, B,et al. Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: EXAFS study and surface complexation modeling[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2011,379(1-3 SI):#REF!. |
| APA | Dou, XM.,Zhang, Y.,Zhao, B.,Wu, XM.,Wu, ZY.,...&吴自玉.(2011).Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: EXAFS study and surface complexation modeling.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,379(1-3 SI),#REF!. |
| MLA | Dou, XM,et al."Arsenate adsorption on an Fe-Ce bimetal oxide adsorbent: EXAFS study and surface complexation modeling".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 379.1-3 SI(2011):#REF!. |
入库方式： OAI收割
来源：高能物理研究所
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