Mechanism of Arsenate (V) Adsorption on TiO2 Surfaces
文献类型：期刊论文
| 作者 | Zhang Mei-Yi ; He Guang-Zhi ; Ding Cheng-Cheng ; Chen Hao ; Pan Gang |
| 刊名 | ACTA PHYSICO-CHIMICA SINICA
 |
| 出版日期 | 2009-10 |
| 卷号 | 25期号:10页码:2034-2038 |
| 关键词 | TiO2 As(V) Adsorption Extended X-ray absorption fine structure Density functional theory Microscopic adsorption mode |
| 中文摘要 | Adsorption of arsenate on TiO, surfaces was investigated using extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DIFT) calculation. The adsorption process was independent of ion strength, indicating the formation of inner-sphere complexes of arsenate on TiO, surfaces. EXAFS analysis showed that the -AsO4 tetrahedral geometry remained relatively rigid before and after adsorption with an As-O distance (R) of (0.1.69+/-0.001) nm. When -AsO4 approached TiO2 surfaces, the As-O-Ti bond formed through the O atoms in -AsO4 clusters. Furthermore, based on the combined results from EXAFS and DFT, As(V) in the 1, equilibrium" adsorption samples was in at least two metastable equilibrium adsorption (MEA) states: double comer (DQ linkage mode (R-1=(0.321+/-0.002) nm, stronger adsorption) and single comer (SC) linkage mode (R-2=(0.360+/-0.002) nm, weak adsorption). The proportion of coordination number between DC and SC MEA states (CNI/CN,) decreased from 3.3 to 1.6 as the surface coverage increased from 9.79 to 28.0 mg . g(-1). This result indicated that at low Surface loading arsenate was adsorbed in more stable DC MEA state, but As(V) tended to be adsorbed in SC MEA state as surface coverage increased. |
| WOS记录号 | WOS:000271079900014 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/21698]  |
| 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 | Zhang Mei-Yi,He Guang-Zhi,Ding Cheng-Cheng,et al. Mechanism of Arsenate (V) Adsorption on TiO2 Surfaces[J]. ACTA PHYSICO-CHIMICA SINICA,2009,25(10):2034-2038. |
| APA | Zhang Mei-Yi,He Guang-Zhi,Ding Cheng-Cheng,Chen Hao,&Pan Gang.(2009).Mechanism of Arsenate (V) Adsorption on TiO2 Surfaces.ACTA PHYSICO-CHIMICA SINICA,25(10),2034-2038. |
| MLA | Zhang Mei-Yi,et al."Mechanism of Arsenate (V) Adsorption on TiO2 Surfaces".ACTA PHYSICO-CHIMICA SINICA 25.10(2009):2034-2038. |
入库方式： OAI收割
来源：生态环境研究中心
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