Arsenic Adsorption on Lanthanum-Impregnated Activated Alumina: Spectroscopic and DFT Study
文献类型：期刊论文
| 作者 | Shi, Qiantao; Yan, Li; Chan, Tingshan; Jing, Chuanyong |
| 刊名 | ACS APPLIED MATERIALS & INTERFACES
 |
| 出版日期 | 2015-12-09 |
| 卷号 | 7期号:48页码:26735-26741 |
| 关键词 | adsorption arsenic coordination modes surface chemishy lanthanum |
| 英文摘要 | Rare earth-modified adsorbents (REMAs) have been widely used to remove oxyanion pollutants from water, including arsenic (As). However, the molecular-level structural information and reactions at the liquid/solid interface are still murky, which limits the design of applicable REMAs. Herein, a lanthanum-impregnated activated alumina (LAA) was synthesized as a representative REMA, and its As uptake mechanisms were explored using multiple complementary characterization techniques. Our adsorption experiments showed that LAA exhibited 2-(3) times higher As adsorption capacity than AA. In contrast to the bidentate configuration formed on most metal oxide surfaces, our EXAFS and DFT results suggest that As(III) and As(V) form monodentate surface complexes on LAA through As-O-La coordinative bonding. In situ flow cell ATR-FTIR observed a strong dependence of As-O peak positions on pH, which could be interpreted as the change in the fractions of As(V) surface complexes with zero- to double-protonation on LAA, AA, and LaOOH. As(V) on LAA existed as singly and doubly protonated surface species, and the pK(a) of transition from double to single protonation (similar to 5.8) was lower than that for its soluble counterpart (6.97). The surface reaction and structural configuration were incorporated in a CD-MUSIC model to satisfactorily predict macroscopic As adsorption behaviors. The insights gained from the molecular-level reactions shed light on the design and application of REMAs in environmental remediation for As and its structural analogues. |
| 研究领域[WOS] | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary |
| WOS记录号 | WOS:000366339100049 |
| 公开日期 | 2016-03-15 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/32518]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Shi, Qiantao,Yan, Li,Chan, Tingshan,et al. Arsenic Adsorption on Lanthanum-Impregnated Activated Alumina: Spectroscopic and DFT Study[J]. ACS APPLIED MATERIALS & INTERFACES,2015,7(48):26735-26741. |
| APA | Shi, Qiantao,Yan, Li,Chan, Tingshan,&Jing, Chuanyong.(2015).Arsenic Adsorption on Lanthanum-Impregnated Activated Alumina: Spectroscopic and DFT Study.ACS APPLIED MATERIALS & INTERFACES,7(48),26735-26741. |
| MLA | Shi, Qiantao,et al."Arsenic Adsorption on Lanthanum-Impregnated Activated Alumina: Spectroscopic and DFT Study".ACS APPLIED MATERIALS & INTERFACES 7.48(2015):26735-26741. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。