The Kinetics of Semiconductor Photocatalysis in Activity-Indicator Films
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Andrew Mills
,
Alix Cusick
Abstract
The kinetics of dye reduction, in photocatalyst indicator ink films on self cleaning glass, is studied with respect to dye concentration. The water-based, photocatalyst indicator inks comprised a redox dye, Dox, a sacrificial electron donor (glycerol) and a polymer, hydroxyethyl cellulose. The dyes used were: Resazurin (Rz), dichloroindophenol (DCIP) and methylene blue (MB), although the latter required acidification of the ink (0.01M HCl) to make it work effectively under ambient conditions. Under anaerobic conditions, the photoreduction of each of the dyes, in an otherwise identical ink formulation, on Activ™ self-cleaning glass is zero-order with respect to [Dox]. Seven commercial samples of Rz, each in a typical ink formulation, were tested on the same piece of self-cleaning glass under aerobic conditions and produced a striking range (over 280%) of different apparent activities for the glass, when there should have been none. The underlying cause of this variation in assessed activity is shown to be due to the combination of a variation in the purity of the commercial samples and the zero-order nature of the kinetics of indicator dye reduction. The relevance of this work and the latter observation, in particular to future use of these films for the rapid assessment of the activities of new and established photocatalytic films, is briefly discussed.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- The Kinetics of Semiconductor Photocatalysis in Activity-Indicator Films
- Degradation of n-Butyl tin Chlorides in Waters. A Comparative Assessment of the Process by Photo-assisted and Chemical- treatment Methods
- Comparison of Emerging NSAID Pollutants Degradation in Aqueous Media by O3/UV-VIS Processes
- Liquid Phase Epoxidation of Allylic Compounds with Hydrogen Peroxide at Autogenic and Atmospheric Pressure over Mesoporous Ti- MCM-48 Catalyst
- Scope of Metal Loaded Microporous Zeolite-Y as Catalyst in Ozone Initiated Oxidation of n-hexadecane
- Solar Photocatalytic Process (TiO2 and Photo-Fenton) to Detoxify Effluents from Water-washed Spray Booths
- Detailed Investigation on the Effect of Washing TiO2 Prepared from Tisalts Flocculated Wastewater Sludge
- Synthesis, Characterization and Photocatalytic Activity of Ag-doped TiO2 Film
- Degradation of Pesticide by Photocatalytic Ozonation Process and Study of Synergistic Effect by Comparison with Photocatalysis and UV/Ozonation Processes
- Reactivity of Peroxyl Radicals towards Hydrogen Donors: A Kinetic ESR Investigation
- Removal of SO2 by Gas-Phase Oxidation Using DBD Micro-gap Discharge Plasma
- Hydrothermal Preparation and Photocatalytic Performance of (I2)n Sensitized and I(V) Doped TiO2 Supported on SiO2
- Photocatalytic Mineralization of Azo Dyes Using Nanostructure ZnO Thin Film Coated on Glass Bead
- Removal of NO2 Produced by Corona Discharge in Indoor Air Cleaning
- Degradation of Bisphenol-A by Ozonation
- Phenolic Acids Ozonation: QSAR Analysis and pH Influence on the Selectivity of Ozone
- Integrated Strategy for Treatment of Winery Wastewaters Using Flocculation, Ozonation and Fenton’s Oxidation
- Photocatalytic Degradation of Tetracycline Hydrochloride in Aqueous Solution at Ambient Conditions Stimulated by Gold Containing Zinc- Titanium Oxide Films
Articles in the same Issue
- The Kinetics of Semiconductor Photocatalysis in Activity-Indicator Films
- Degradation of n-Butyl tin Chlorides in Waters. A Comparative Assessment of the Process by Photo-assisted and Chemical- treatment Methods
- Comparison of Emerging NSAID Pollutants Degradation in Aqueous Media by O3/UV-VIS Processes
- Liquid Phase Epoxidation of Allylic Compounds with Hydrogen Peroxide at Autogenic and Atmospheric Pressure over Mesoporous Ti- MCM-48 Catalyst
- Scope of Metal Loaded Microporous Zeolite-Y as Catalyst in Ozone Initiated Oxidation of n-hexadecane
- Solar Photocatalytic Process (TiO2 and Photo-Fenton) to Detoxify Effluents from Water-washed Spray Booths
- Detailed Investigation on the Effect of Washing TiO2 Prepared from Tisalts Flocculated Wastewater Sludge
- Synthesis, Characterization and Photocatalytic Activity of Ag-doped TiO2 Film
- Degradation of Pesticide by Photocatalytic Ozonation Process and Study of Synergistic Effect by Comparison with Photocatalysis and UV/Ozonation Processes
- Reactivity of Peroxyl Radicals towards Hydrogen Donors: A Kinetic ESR Investigation
- Removal of SO2 by Gas-Phase Oxidation Using DBD Micro-gap Discharge Plasma
- Hydrothermal Preparation and Photocatalytic Performance of (I2)n Sensitized and I(V) Doped TiO2 Supported on SiO2
- Photocatalytic Mineralization of Azo Dyes Using Nanostructure ZnO Thin Film Coated on Glass Bead
- Removal of NO2 Produced by Corona Discharge in Indoor Air Cleaning
- Degradation of Bisphenol-A by Ozonation
- Phenolic Acids Ozonation: QSAR Analysis and pH Influence on the Selectivity of Ozone
- Integrated Strategy for Treatment of Winery Wastewaters Using Flocculation, Ozonation and Fenton’s Oxidation
- Photocatalytic Degradation of Tetracycline Hydrochloride in Aqueous Solution at Ambient Conditions Stimulated by Gold Containing Zinc- Titanium Oxide Films
