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Effects of O2 and H2O2 on TiO2 Photocatalytic Efficiency Quantified by Formaldehyde Formation from Tris(hydroxymethyl)aminomethane
-
Veronica Diesen
und
Mats Jonsson
Veröffentlicht/Copyright:
30. November 2016
Abstract
The impact of O2 and H2O2 on the efficiency of TiO2 photocatalysis has been studied in this work. Tris(hydroxymethyl)aminomethane (Tris) was used to probe the efficiency. Upon hydrogen abstraction by e.g. hydroxyl radicals from Tris, formaldehyde is formed. This product was detected and quantified using a modified version of the Hantzsch method. A significant increase in the formaldehyde production rate was observed upon addition of O2 or H2O2. It was also found that O2 and H2O2 are equally effective in scavenging the photo-excited electron, which is probably a result of their similar adsorption properties. A strong concentration dependence, independent of O2 or H2O2 content, was found at low Tris concentrations (< 100 mM). Adsorption studies of H2O2 onto the TiO2 surface were performed in order to explore the rate controlling reactions. The results show that H2O2, having a stronger adsorption affinity than Tris towards the photocatalytic surface, govern the kinetics, but only until a monolayer is built up.
Received: 2011-10-26
Revised: 2012-7-18
Accepted: 2012-9-8
Published Online: 2016-11-30
Published in Print: 2013-1-1
© 2016 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Electrochemical Inactivation of P. Aeruginosa, A. hydrophila, L. pneumophila using Boron Doped Diamond Anodes
- Effects of O2 and H2O2 on TiO2 Photocatalytic Efficiency Quantified by Formaldehyde Formation from Tris(hydroxymethyl)aminomethane
- Non-Thermal Plasma Aided Soil Decontamination
- Ozone Degradation of Alcohols, Ketones, Ethers and Hydroxybenzenes: Determination of Pathways and Kinetic Parameters
- Power Systems of Plasma Reactors for Non-Thermal Plasma Generation
- Nitrate Removal on a Cu/Cu2O Photocathode under UV Irradiation and Bias Potential
- Gas-phase Photocatalytic Partial Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone on Au/TiO2 Photocatalysts
- DegradationMechanism of Acidic Congo Red in Sunlight/Fe2+/S2O82- System
- Oxidative Degradation of Bisphenol A: A Comparison Between Fenton Reagent, UV, UV/H2O2 and Ultrasound
- CuInS2 Superstrate Solar Cells with ZnO Compact Layer Fabricated by Totally Non-vacuum Methods
- Degradation of Ciprofloxacin and Oxytetracycline Antibiotics in Waste Sewage Sludge by Ozonation
- Quantitative Removal of β-Lactam Antibiotic Activity by Hydroxyl Radical Reaction in Water: How Much Oxidation is Enough?
- Photoelectrocatalytic Decomposition of Acid Red 4 in Aqueous Solution Using Prepared TiO2 Nanotube Arrays of Various Lengths
- Nitrogen-doped TiO2 Photocatalysts Synthesized from Titanium Nitride: Characterizations and Photocatalytic Hydrogen Evolution Performance
- Investigation of the use of Chlorine Based Advanced Oxidation in Surface Water: Oxidation of Natural Organic Matter and Formation of Disinfection Byproducts
- Photodegradation of Benzo-[a]-pyrene on the Surface of the Photocatalytic Paints and Analysis of the Degradation Products
- Ozonation of Textile Reactive Red 198 Dye in a CSTR
- Fabrication of Rh-doped Bi2O3 with Enhanced Photocatalytic Performance by Sol-gel Method
- Photocatalytic Degradation of Phenol in Aqueous Solution by Titanium Dioxide Coupled with Magnetic Field
- Comparison of Different UV-activated AOP Methods
- Degradation of Dithizone by Non Thermal Quenched Plasma of Gliding Arc Type
- Calcination Effects on Properties of TiO2/HZSM-5 Photocatalyst Using Pretreated HZSM-5 Support
