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| EXAFS study of the interfacial interaction of nickel(II) on titanate nanotubes: Role of contact time, pH and humic substances | |
| Sheng, GD; Ye, L; Li, YM; Dong, HP; Li, H; Gao, X; Huang, YY; gdsheng@usx.edu.cn | |
| 2014 | |
| Source Publication | CHEMICAL ENGINEERING JOURNAL
 |
| ISSN | 1385-8947 |
| Volume | 248Pages:71—78 |
| Abstract | In this work, the interaction mechanism and local atomic structures of Ni(II) on titanate nanotubes (TNTs) as a function of contact time, solution pH and addition of humic acid (HA) or fulvic acid (FA) were studied mainly via the extended X-ray absorption fine structure (EXAFS) spectroscope. The results indicate that Ni(II) can be interacted with TNTs by different mechanisms, largely depending on environmental conditions. At pH 4.0 and short contact time, Ni(II) interaction with TNTs is mainly dominated by outer-sphere surface complexation. With medium increasing pH, Ni(II) interaction with TNTs tends to transform from outer-sphere surface complexes to inner-sphere surface complexes, and a mixture of inner-sphere surface complexes and surface precipitates is formed at pH 7.0 or 8.0. Besides, the interaction of Ni(II) with TNTs becomes more favorable over extended time, and EXAFS spectra analysis indicates outer-sphere surface complexes at short contact time is transformed to inner-sphere surface complexes and surface precipitates over long contact time. The addition of HA or FA enhances Ni(II) interaction with TNTs at low pH, which is attributed to the formation of "metal-bridging" (type A) and "ligand-bridging" (type B) ternary surface complexes. The results obtained are very important to understand the interaction of Ni(II) and related heavy metal ion with nano-materials such as TNTs once released into natural environment. (c) 2014 Elsevier B.V. All rights reserved. |
| Keyword | Nuclear-magnetic-resonance Illite-water Suspensions Fulvic-acid Ionic-strength Radionuclide Ni-63(Ii) Mx-80 Bentonite Adsorption Sorption Batch Xps |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000337649000008 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/14126 |
| Collection | 中科院上海应用物理研究所2011-2020年 |
| Corresponding Author | gdsheng@usx.edu.cn |
| Recommended Citation GB/T 7714 | Sheng, GD,Ye, L,Li, YM,et al. EXAFS study of the interfacial interaction of nickel(II) on titanate nanotubes: Role of contact time, pH and humic substances[J]. CHEMICAL ENGINEERING JOURNAL,2014,248:71—78. |
| APA | Sheng, GD.,Ye, L.,Li, YM.,Dong, HP.,Li, H.,...&gdsheng@usx.edu.cn.(2014).EXAFS study of the interfacial interaction of nickel(II) on titanate nanotubes: Role of contact time, pH and humic substances.CHEMICAL ENGINEERING JOURNAL,248,71—78. |
| MLA | Sheng, GD,et al."EXAFS study of the interfacial interaction of nickel(II) on titanate nanotubes: Role of contact time, pH and humic substances".CHEMICAL ENGINEERING JOURNAL 248(2014):71—78. |
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