Electrophoretic Study of the SnO2/Aqueous Solution Interface up to 260 degrees C.

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Langmuir

DOI:https://doi.org/10.1021/la900611u· OSTI ID:1007869

Rodriguez-Santiago, V ^[1]; Fedkin, Mark V. ^[2]; Wesolowski, David J ^[3]

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1. Oak Ridge National Laboratory (ORNL)
2. Pennsylvania State University
3. ORNL

An electrophoresis cell developed in our laboratory was utilized to determine the zeta potential at the SnO{sub 2} (cassiterite)/aqueous solution (10{sup -3} mol kg{sup -1} NaCl) interface over the temperature range from 25 to 260 C. Experimental techniques and methods for the calculation of zeta potential at elevated temperature are described. From the obtained zeta potential data as a function of pH, the isoelectric points (IEPs) of SnO{sub 2} were obtained for the first time. From these IEP values, the standard thermodynamic functions were calculated for the protonation-deprotonation equilibrium at the SnO{sub 2} surface, using the 1-pK surface complexation model. It was found that the IEP values for SnO{sub 2} decrease with increasing temperature, and this behavior is compared to the predicted values by the multisite complexation (MUSIC) model and other semitheoretical treatments, and were found to be in excellent agreement.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1007869
• Journal Information: Langmuir, Vol. 25, Issue 14; ISSN 0743-7463
• Country of Publication: United States
• Language: English