You are here:
LEAD SORPTION ON RUTHENIUM OXIDE: A MACROSCOPIC AND SPECTROSCOPIC STUDY
Citation:
Scheckel*, K G., C A. Impellitteri**, AND J. A. RYAN. LEAD SORPTION ON RUTHENIUM OXIDE: A MACROSCOPIC AND SPECTROSCOPIC STUDY. IN: Advanced Photon Source Activity Report 2002, Argonne National Laboratory, Argonne, ILANL-03/21, (2003).
Description:
Metal oxide phases play an important role in governing the sorption and desorption mechanisms of metals in water, soils, and sediments. Many researchers have examined the efficiency of Pb sorption on Mn, Fe, Al, Ti, and Si oxide surfaces. Most studies concluded that adsorption of Pb onto the oxide surface was the sorption mechanism; however, some studies observed induced coprecipitation of Pb with the oxide phase. To be an effective remediation sorbent for Pb removal from solution, a cost analysis for the amount of Pb sorbed per unit cost of sorbent must be determined. Commonly, most of the examples listed above rarely achieve more than a few weight percent Pb per unit weight of sorbent. Beyond the ability to sorb large amounts of Pb from solution, understanding the sorption mechanism and potential stability of the Pb complex yields data applicable to designing higher capacity and more efficient sorbents. In this study, the sorption and desorption of Pb on RuO2 x H2O were examined kinetically and thermodynamically via spectroscopic and macroscopic investigations. X-ray absorption spectroscopy (XAS) was employed to determine the sorption mechanism with regard to identity of nearest atomic neighbors, bond distances (R), and coordination numbers (N).