Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite
文献类型：期刊论文
| 作者 | Ruan, HD; Liu, F; Tan, WF; Feng, XH; He, JZ |
| 刊名 | ACTA GEOLOGICA SINICA-ENGLISH EDITION
 |
| 出版日期 | 2006 |
| 卷号 | 80期号:2页码:249-256 |
| 关键词 | Mn Oxide Mineral Goethite Oxidation As-iii As-v |
| 英文摘要 | Oxidation of As-III by three types of manganese oxide minerals affected by goethite was investigated by chemical analysis, equilibrium redox, X-ray diffraction (XRD) and transmission electron microscopy (TEM). Three synthesized Mn oxide minerals of different types, birnessite, todorokite, and hausmannite, could actively oxidize As-III to As-V, and greatly varied in their oxidation ability. Layer structured birnessite exhibited the highest capacity of As-III oxidation, followed by the tunnel structured todorokite. Lower oxide hausmannite possessed much low capacity of As-III oxidation, and released more Mn2+ than birnessite and todorokite during the oxidation. The maximum amount of As-V produced during the oxidation of As-III by Mn oxide minerals was in the order: birnessite (480.4 mmol/kg) > todorokite (279.6 mmol/kg) > hausmannite (117.9 mmol/kg). The oxidation capacity of the Mn oxide minerals was found to be relative to the composition, crystallinity, and surface properties. In the presence of goethite oxidation of As-III by Mn oxide minerals increased, with maximum amounts of As-V being 651.0 mmol/kg for birnessite, 332.3 mmol/kg for todorokite and 159.4 mmol/kg for hausmannite. Goethite promoted As-III oxidation on the surface of Mn oxide minerals through adsorption of the As-V produced, incurring the decrease of As-V concentration in solutions. Thus, the combined effects of the oxidation (by Mn oxide minerals)-adsorption (by goethite) lead to rapid oxidation and immobilization of As in soils and sediments and alleviation of the As-III toxicity in the environments. |
| WOS记录号 | WOS:000237430400015 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23067]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Ruan, HD,Liu, F,Tan, WF,et al. Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2006,80(2):249-256. |
| APA | Ruan, HD,Liu, F,Tan, WF,Feng, XH,&He, JZ.(2006).Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite.ACTA GEOLOGICA SINICA-ENGLISH EDITION,80(2),249-256. |
| MLA | Ruan, HD,et al."Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite".ACTA GEOLOGICA SINICA-ENGLISH EDITION 80.2(2006):249-256. |
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。