Degradation of Pesticide by Photocatalytic Ozonation Process and Study of Synergistic Effect by Comparison with Photocatalysis and UV/Ozonation Processes
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R. Rajeswari
und
S. Kanmani
Abstract
Synergistic effect of TiO2 photocatalytic ozonation (a combination of TiO2 photocatalytic oxidation and ozonation) was investigated for the degradation of pesticide Carbaryl. The experiments were conducted under different ozone dosages (0.12-0.57 g/h), catalyst dosage (0.5-2 g/L), pH (3-9) and light source (254 and 365 nm) to arrive at optimized reaction conditions for carbaryl degradation by photocatalytic ozonation. Then, three experimental sets (TiO2/UV, UV/O3 and TiO2/UV/O3) were conducted under optimized reaction conditions to prove the synergistic effect of ozone on TiO2 photocatalysis. By photocatalytic ozonation process, complete removal of parent carbaryl molecule and 77% mineralization was achieved. The kinetic study showed that degradation rate constant with TiO2/UV/O3 was 2.3 times higher than O3/UV and 4.4 times higher than that of TiO2/UV. The laboratory study has also demonstrated that effective utilization of ozone in the combined process. Thus, photocatalytic ozonation process will overcome the disadvantage of the selectivity of ozonation and the lower efficiency of TiO2 photocatalysis in the degradation of pesticides.
© 2016 by Walter de Gruyter Berlin/Boston
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- 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
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Artikel in diesem Heft
- 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
