| Numéro |
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
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|---|---|---|
| Page(s) | C2-773 - C2-775 | |
| DOI | https://doi.org/10.1051/jp4:1997233 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-773-C2-775
DOI: 10.1051/jp4:1997233
1 Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19717-1303, U.S.A
2 Bldg. 510E, Brookhaven National Laboratory, Upton, NY 11971, U.S.A
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-773-C2-775
DOI: 10.1051/jp4:1997233
The Kinetics of Nickel Sorption on Pyrophyllite as Monitored by X-Ray Absorption Fine Structure (XAFS) Spectroscopy
A.M. Scheidegger1, G.M. Lamble2 and D.L. Sparks11 Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19717-1303, U.S.A
2 Bldg. 510E, Brookhaven National Laboratory, Upton, NY 11971, U.S.A
Abstract
This study investigated the effect of reaction time (minutes to months) on the surface coordination environment of Ni sorbed onto pyrophyllite using XAFS. The data suggest the appearance of multinuclear Ni complexes after a reaction time of minutes. As reaction time progresses, these multinuclear Ni complexes increased in size ((NNi-Ni = 1.4-4.5). Ni-Ni bond distances (2.99-3.03 Å) were similar to those for mixed Ni-Al hydroxides (3.03 Å), but distinctively shorter than those for Ni(OH)2(s) (3.09 Å). We propose that the formation of mixed Ni-Al hydroxides may explain the observed bond distances and coordination numbers.
© EDP Sciences 1997