Hexavalent chromium and oxytetracycline binding to environmental interfaces studied by second harmonic generation

AEI 53

Amanda L. Mifflin1, Christopher T. Konek, chris.konek@gmail.com2, Michael J. Musorrafiti, musorm@northwestern.edu2, and Franz M. Geiger, f-geiger@northwestern.edu2. (1) Department of Chemistry, Bowdoin College, Brunswick, ME 04011, (2) Department of Chemistry, Northwestern University, 2145 Sheridan Road, Tech Institute: K161, Evanston, IL 60208
Binding of pollutants at geosorbent surfaces is controlled by adsorption, desorption and redox processes, and a detailed kinetic and thermodynamic understanding of these processes is needed for predicting the transport of pollutants released into the environment. In this work, second harmonic generation is used to investigate Cr(VI) and oxytetracycline interactions with ester- and carboxylic acid-functionalized silica/water interfaces. Direct surface-specific measurements yield binding parameters that are obtained with surface specificity at environmentally relevant concentrations. These studies also indicate that kinetic parameters should be explicitly incorporated into transport models when scaled up for real world applications. This work provides a significant contribution to the effort of improving the pollutant transport models used in establishing remediation policies.
 

Academic Employment Initiative
8:00 PM-10:00 PM, Monday, August 20, 2007 BCEC -- Exhibit Hall - B2, Sci-Mix

Academic Employment Initiative

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007