The Kinetics of Nickel Sorption on Pyrophyllite as Monitored by X-Ray Absorption Fine Structure (XAFS) Spectroscopy

A. M. Scheidegger, G. M. Lamble, D. L. Sparks
1997 Journal de Physique IV : Proceedings  
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 A) were similar to those for mixed Ni-A1 hydroxides (3.03 A), but distinctively shorter than those for Ni(OH)2(s)
more » ... for Ni(OH)2(s) (3.09 A). We propose that the formation of mixed Ni-AI hydroxides may explain the observed bond distances and coordination numbers.
doi:10.1051/jp4:1997233 fatcat:ww5ysmn3mfep5awtipq4z24tra