Considerations of Particle Size in Aqueous Phase Photocatalysis kinetics with TiO2
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Catherine Almquist
Abstract
There are inconsistencies in the literature regarding the optimum particle size for TiO2 in photocatalytic oxidation reactions in aqueous slurries. The apparent optimum particle size has been reported as low as 3 nm and ranges to greater than 30 nm. It was hypothesized that the inconsistencies reported in the literature stem from differences in the photocatalyst, the reactor system and the operating parameters used, among other factors. In this study, a mathematical model was developed to elucidate the effects of selected operating parameters on the apparent optimum particle size in aqueous-phase TiO2 photocatalysis. The model utilizes five parameters, which were varied to best fit one set of experimental data: the photocatalytic oxidation of dimethyl methylphosphonate (DMMP) in water. For this set of experimental data, the apparent optimum particle size was approximately 25 nm, and the model parameters were set to fit this set of data. The sensitivity of the model to the model parameters and operating conditions were assessed, and the theoretical trends based upon model calculations were supported by observed trends of experimental data reported in the literature. It was found that the apparent optimum particle size can change significantly with TiO2 concentration and depth of slurry perpendicular to the incident light. This supports that the light scattering model parameter, kscat, is the most significant model parameter that determines the apparent optimum particle size.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface
- A Brief Survey of the Potential Health Risks of TiO2 Particles and TiO2- Containing Photocatalytic or Non-Photocatalytic Materials
- What Are Titania Photocatalysts?―An Exploratory Correlation of Photocatalytic Activity with Structural and Physical Properties
- Considerations of Particle Size in Aqueous Phase Photocatalysis kinetics with TiO2
- Binary Cationic BDDAC/Anionic DoS Surfactant Systems of Variable Compositions.Mineralization by an Advanced Oxidation Process in Aqueous Dispersions
- The Role of Non-Metal Doping in TiO2 Photocatalysis
- Photocatalysis and Catalytic Properties of Nano-sized N-TiO2 Catalyst Synthesized by Sol-gel Methods
- Effects of Surface Modification on the Photocatalytic Activity of TiO2
- Carbon-modified TiO2 as Photocatalysts
- Photocatalytic Reduction of Organic Compounds
- Photocatalytic Activity for NO Degradation by Construction Materials: Parametric Study andMultivariable Correlations
Articles in the same Issue
- Preface
- A Brief Survey of the Potential Health Risks of TiO2 Particles and TiO2- Containing Photocatalytic or Non-Photocatalytic Materials
- What Are Titania Photocatalysts?―An Exploratory Correlation of Photocatalytic Activity with Structural and Physical Properties
- Considerations of Particle Size in Aqueous Phase Photocatalysis kinetics with TiO2
- Binary Cationic BDDAC/Anionic DoS Surfactant Systems of Variable Compositions.Mineralization by an Advanced Oxidation Process in Aqueous Dispersions
- The Role of Non-Metal Doping in TiO2 Photocatalysis
- Photocatalysis and Catalytic Properties of Nano-sized N-TiO2 Catalyst Synthesized by Sol-gel Methods
- Effects of Surface Modification on the Photocatalytic Activity of TiO2
- Carbon-modified TiO2 as Photocatalysts
- Photocatalytic Reduction of Organic Compounds
- Photocatalytic Activity for NO Degradation by Construction Materials: Parametric Study andMultivariable Correlations
