Reactivity at (nano)particle-water interfaces,redox processes,and arsenic transport in the environment |
| |
| Authors: | Laurent Charlet Guillaume Morin Jérôme Rose Yuheng Wang Mélanie Auffan André Burnol Alejandro Fernandez-Martinez |
| |
| Institution: | 1. ISTerre, université Grenoble I and CNRS, PO Box 53, 38041 Grenoble, France;2. IMPMC, UMR7590 CNRS-UPMC-UPD-IPGP, 140, rue Lourmel, 75015 Paris, France;3. CEREGE, université Aix-Marseille et CNRS, Europôle de l’Arbois, 13545 Aix-en-Provence, France;4. BRGM, avenue Claude-Guillemin, BP 36009, 45060 Orléans cedex 02, France;5. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Mail Stop 90R1116, Berkeley, CA 94720, USA |
| |
| Abstract: | Massive deleterious impacts to human health are resulting from the use of arsenic-bearing groundwaters in South-East Asia deltas and elsewhere in the world for drinking, cooking and/or irrigation. In Bangladesh alone, a fifth of all deaths are linked to arsenicosis. In the natural and engineered subsurface environment, the fate of arsenic is, to a large extent, controlled by redox potential, pH, as well as total iron, sulfur and carbonate content, via sorption and coprecipitation on a variety of natural and engineered (nano)particles. In the present article, we address: (1) new insights in the sorption mechanisms of As on Fe(II) and Fe(III) nanophases recognized to play an important role in the microbial cycling of As and Fe; (2) artifacts often encountered in field and laboratory studies of As speciation due to the extreme redox sensitivity of the Fe-As-O-H phases; and (3) as a conclusion, the implications for water treatment. Indeed the specific reactivity of nanoparticles accounts not only for the As bioavailability within soils and aquifers, but also opens new avenues in water treatment. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
