| Abstract: |
A detailed investigation of equilibrium surface adsorption reactions and rate-controlled photochemi- cally induced redox eactions was conducted to include surface complexation modeling in the development of a mechanistic rate law. The investigation included a parametric study of selenite oxidation in the presence of irradiated titania and was divided into five parts, the rate of selenite oxidation as a function of (1) light intensity, (2) pH, (3) ionic strength, (4) oxygen partial pressure, and (5) selenite concentration. The titania used was characterized for its equilibrium surface properties, and surface speciation was modeled using the triple-layer model with the computation routine HYDRAQL. A kinetic model was successfully developed that related the measured quantum yield to titania surface species developed through surface haracterization and triple-layer modeling. |
