EXAFS studies on adsorption-desorption reversibility at manganese oxides-water interfaces I. Irreversible adsorption of zinc onto manganite (gamma-MnOOH)
文献类型：期刊论文
| 作者 | Pan, G; Qin, YW; Li, XL; Hu, TD; Wu, ZY; Xie, YN |
| 刊名 | JOURNAL OF COLLOID AND INTERFACE SCIENCE
 |
| 出版日期 | 2004 |
| 卷号 | 271期号:1页码:28-34 |
| 关键词 | zinc manganite EXAFS adsorption-desorption adsorption reversibility metastable-equilibrium adsorption |
| 英文摘要 | Microscopic structures of Zn(II) surface complexes adsorbed at the manganite (gamma-MnOOH)-water interface were studied using extended X-ray absorption fine structure (EXAFS) spectroscopy. Quantitative analysis of the first sphere showed that, in a 0.1 M NaNO(3) solution of pH 7.5, Zn(II) was adsorbed as a mixture of tetrahedral and octahedral structure (ZnO(4,6) polyhedra) and the average Zn-O distance was 2.00 +/- 0.01 Angstrom. EXAFS analysis of the second sphere showed that two typical atomic Zn-Mn distances of 3.07 +/- 0.01 and 3.52 +/- 0.02 Angstrom existed in the surface complexes, indicating that there were two types of linkage, i.e., the edge-linkage of high affinity and the corner-linkage of low affinity, between the ZnO(4,6) polyhedra and the MnO(6) octahedra of the manganite. Macroscopic adsorption-desorption experiments showed that adsorption of Zn(II) onto manganite was largely irreversible and the stronger edge-linkage mode was found to be responsible for the adsorption irreversibility. This result provided direct evidence from the molecular level for the basic hypothesis of the metastable-equilibrium adsorption (MEA) theory that adsorption density is not a thermodynamic state variable because a given value of adsorption density could have different values of chemical potential, depending on the proportion between the edge and corner linkage modes. (C) 2003 Elsevier Inc. All rights reserved. |
| 研究领域[WOS] | Chemistry |
| WOS记录号 | WOS:000188778600004 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23524]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Pan, G,Qin, YW,Li, XL,et al. EXAFS studies on adsorption-desorption reversibility at manganese oxides-water interfaces I. Irreversible adsorption of zinc onto manganite (gamma-MnOOH)[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2004,271(1):28-34. |
| APA | Pan, G,Qin, YW,Li, XL,Hu, TD,Wu, ZY,&Xie, YN.(2004).EXAFS studies on adsorption-desorption reversibility at manganese oxides-water interfaces I. Irreversible adsorption of zinc onto manganite (gamma-MnOOH).JOURNAL OF COLLOID AND INTERFACE SCIENCE,271(1),28-34. |
| MLA | Pan, G,et al."EXAFS studies on adsorption-desorption reversibility at manganese oxides-water interfaces I. Irreversible adsorption of zinc onto manganite (gamma-MnOOH)".JOURNAL OF COLLOID AND INTERFACE SCIENCE 271.1(2004):28-34. |
入库方式： OAI收割
来源：生态环境研究中心
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