Surface Complexation of Pb(II) at Oxide-Water Interfaces: III. XAFS Determination of Pb(II) and Pb(II)-Chloro Adsorption Complexes on Goethite and Alumina

Details Surface Complexation of Pb(II) at Oxide-Water Interfaces: III. XAFS Determination of Pb(II) and Pb(II)-Chloro Adsorption Complexes on Goethite and Alumina Surface Complexation of Pb(II) at Oxide-Water Interfaces: III. XAFS Determination of Pb(II) and Pb(II)-Chloro Adsorption Complexes on Goethite and Alumina

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62..193b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 62, Issue 2, pp.193-207

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Pb(II) sorption on goethite and -alumina was studied in aqueous 0.1 M NaCl solutions as a function of pH (5-7), sorption density (1.2-5 moles/m 2 ), and [Pb] T (0.24-4.53 mM) using XAFS (X-ray absorption fine structure) spectroscopy. At pH 7, the presence of Cl - has little effect on the Pb(II)/goethite and Pb(II)/ -alumina adsorbate spectra. However, at pH 6, the XAFS spectra indicate the presence of Pb(II)-chloro ternary complexes on goethite. XAFS-derived Pb-Fe distances suggest that these complexes are attached to goethite surfaces through Pb---O sfc and Cl - ---Fe sfc bonds simultaneously, i.e., both Pb(II) and Cl - ions bond as an inner-sphere species. In contrast, Pb---Cl - ---Al sfc ternary complexes were not observed on -alumina. These results suggest that the stability trends of Cl - ---Me-oxide bonds are similar to the relative stabilities of aqueous Me-chloride complexes, where Me is an oxide-forming cation. Cl - ---Fe sfc and adsorbate-Cl - ---Fe sfc bonding should be taken into account when describing surface complexation of Pb(II) and other soft Lewis acid metal ions on iron oxides and iron oxyhydroxides in Cl - -bearing waters.

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