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XAFS study of Pb (II) sorption at the α-Al2O3-water interface

✍ Scribed by J.R. Bargar; G.E. Brown Jr.; G.A. Parks

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
137 KB
Volume
208-209
Category
Article
ISSN
0921-4526

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✦ Synopsis

XAFS spectra of Pb(II) adsorbed at the a-A1203-water interface were collected over a range of pH, total Pb concentration, and sorption density (F) in 0.1 M NaNO3. One sample prepared in 0.1 M NaCI was also analyzed to examine the effect of the background electrolyte. As F increases, sorbed Pb(II) polymerizes on the ot-A1203 surface, and static disorder around Pb(II) decreases. Significant Ist and 2nd shell differences exist for samples in the two electolytes. Oxo-or hydroxo-bridged Pb(II) oligomers are believed to form at the et-A12Oa-water interface. The number of Pb(II) 2nd neighbors is consistent with Pb4(OH)~+-like complexes at the highest F examined.

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