Photocatalytic Oxidation of Multi-Component Systems – An Investigation Using Toluene/Ethylbenzene, Octane/Decane/Dodecane and Formaldehyde/Acetaldehyde
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Wenhao Chen
and
Jianshun Jensen Zhang
Abstract
In the design of UV-PCO-based air cleaners for improving IAQ, multiple compounds interference effects need to be quantified because indoor environment has multiple VOCs under low concentrations (typically at ppb and sub-ppb levels). This paper presents a systematic experimental investigation using a labscale UV-PCO reactor under individual vs. multiple VOC challenges. Tests were conducted for two aromatics (toluene and ethylbenzene) and two aldehydes (formaldehyde and acetaldehyde) as individual compound and binary mixture, and three alkanes (octane, decane and dodecane) as individual compound, binary and ternary mixtures. An annular tube reactor coated with Degussa TiO2/3% WO3 (by weight) was placed in a small-scale (50 L) stainless steel chamber. The test chamber had a continuous feed flow and the system operated as a continuous stirred tank reactor. The concentration of test VOCs at chamber inlet ranged from 0.5 to 35 mg/m3. The overall reaction rates were measured. The mass transfer effects were quantified. The average reaction rate constants were then determined. Reversible deactivations were observed for toluene and ethylbenzene as individual VOCs and as mixture. For the individual compound tests, the bimolecular L-H rate form fit experimental data best. For the binary mixture tests, the bimolecular L-H rate model with the binary component competitive adsorption considered described the trend of experimental data well, and the rate coefficients from the PCO reaction of individual compound could apply. As for alkanes and aldehydes, the reaction rate was linearly dependent on the reactant concentration within the tested concentration range. The competition/interference effects between different compounds (except octane in one ternary mixture test) were insignificant under test conditions. Results also indicate that mass transfer resistance needs to be considered under low VOC concentration levels and high UV intensities (typical for an annular tube reactor as UV lamp is in the middle of the tube) because it is likely in the same order of magnitude as the reaction resistance.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface
- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
- Photocatalytic Decolorization of Methylene Blue with Two Photoreactors
- Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model
- Evaluation of Zinc Oxide-Based Photocatalytic Degradation of a Commercial Pesticide
- Photocatalytic Activity of W-Doped TiO2 Nanopowders
- Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale
- Effect of Ultrasound on the Properties of Heterogeneous Catalysts for Sono-Fenton Oxidation Processes
- AOP in Water by Means of a DBD Conducted in a Coaxial Reactor
- Removal of Atrazine from Simulated Groundwater by AOTs
- Modelling Approach to Fenton and Photo-Fenton Treatments
- Chlorobenzene Degradation Assisted by TiO2 under UV Irradiation in Aqueous Solutions
- Optimization of Parameters for Hydrogen Production by Photocatalytic Alcohol Reforming in the Presence of Pt/TiO2 Nanocrystalline Thin Films
- Study on Bipolar Corona Discharge in Emitting Needle Electrode Configuration
- I-V Characteristics of Corona Discharge in Emitting Wire Electrode Configuration
- Micro-pore Ceramic Filter and UV System as Ballast Water Treatment: Preliminary Study on Chlorella Removal and Bacteria Inactivation
- Application of Box–Wilson Experimental Design Method for the Photocatalytic Degradation of Remazol Brilliant Blue R-A with Solar UV/TiO2/Fe(III) Processes
- Treatment of Industrial Cork Processing Water by Ozonation and Ozone Based Advanced Oxidation Processes (O3/UV and O3/H2O2) in a Bubble Column Reactor
- Chemo- and Regio-Selectivity in the TiO2-Mediated Photooxidation of 1,n-diols
- Photosensitized Chlorobenzene Degradation by UV/H2O2 Oxidation
- Influence of Solution Composition and Chemical Structure of Dye on Removal of Organic Dye by DC Diaphragm Discharge in Water solutions
- Photocatalytic Oxidation of Multi-Component Systems – An Investigation Using Toluene/Ethylbenzene, Octane/Decane/Dodecane and Formaldehyde/Acetaldehyde
Articles in the same Issue
- Preface
- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
- Photocatalytic Decolorization of Methylene Blue with Two Photoreactors
- Determination of Quantum Yield in a Heterogeneous Photocatalytic System Using a Fitting-Parameters Model
- Evaluation of Zinc Oxide-Based Photocatalytic Degradation of a Commercial Pesticide
- Photocatalytic Activity of W-Doped TiO2 Nanopowders
- Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale
- Effect of Ultrasound on the Properties of Heterogeneous Catalysts for Sono-Fenton Oxidation Processes
- AOP in Water by Means of a DBD Conducted in a Coaxial Reactor
- Removal of Atrazine from Simulated Groundwater by AOTs
- Modelling Approach to Fenton and Photo-Fenton Treatments
- Chlorobenzene Degradation Assisted by TiO2 under UV Irradiation in Aqueous Solutions
- Optimization of Parameters for Hydrogen Production by Photocatalytic Alcohol Reforming in the Presence of Pt/TiO2 Nanocrystalline Thin Films
- Study on Bipolar Corona Discharge in Emitting Needle Electrode Configuration
- I-V Characteristics of Corona Discharge in Emitting Wire Electrode Configuration
- Micro-pore Ceramic Filter and UV System as Ballast Water Treatment: Preliminary Study on Chlorella Removal and Bacteria Inactivation
- Application of Box–Wilson Experimental Design Method for the Photocatalytic Degradation of Remazol Brilliant Blue R-A with Solar UV/TiO2/Fe(III) Processes
- Treatment of Industrial Cork Processing Water by Ozonation and Ozone Based Advanced Oxidation Processes (O3/UV and O3/H2O2) in a Bubble Column Reactor
- Chemo- and Regio-Selectivity in the TiO2-Mediated Photooxidation of 1,n-diols
- Photosensitized Chlorobenzene Degradation by UV/H2O2 Oxidation
- Influence of Solution Composition and Chemical Structure of Dye on Removal of Organic Dye by DC Diaphragm Discharge in Water solutions
- Photocatalytic Oxidation of Multi-Component Systems – An Investigation Using Toluene/Ethylbenzene, Octane/Decane/Dodecane and Formaldehyde/Acetaldehyde
