Photocatalytic Activity of W-Doped TiO2 Nanopowders
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Katarzyna A. Michalow
,
Felix A. Reifler
Abstract
Polycrystalline tungsten-doped titanium dioxide nanopowders within a dopant concentration of 0-1 at.% were prepared by a one-step flame spray synthesis (FSS). Mixtures of titanium tetra-isopropoxide dissolved in ethanol and tungsten hexacarbonyl solubilized in tetrahydrofuran were used as precursors. The specific surface area (SSA) of the powders was between 40 and 130 m2/g depending on the process parameters, namely the flame combustion stoichiometry and their chemical composition. Irrespective of their composition the powders consisted of spherical particles, as visible by transmission electron microscopy (TEM). They are highly crystallized with anatase as the predominant phase, according to X-ray diffraction (XRD). The band gap energy was determined by spectrophotometric measurement and was between 3.29 eV and 3.34 eV. The photocatalytic performance of the powders was studied by the degradation of methylene blue (MB) and methyl orange (MO) in aqueous suspensions under UV-A (365 nm) as well as visible (400-500 nm) irradiation. The catalytic activity was determined as a function of the tungsten concentration, the specific surface area and the flame combustion stoichiometry. It was found that the TiO2-0.7 at %W particles with high SSA have the highest photoactivity for degradation of MB and MO. This can be explained by the incorporation of the tungsten into the TiO2 crystal lattice as well as modification surface properties.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Preface
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- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
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- 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
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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
