Characterization and Photocatalytic Performance of Potassium-Doped Titanium Oxide Nanostructures Prepared via Wet Corrosion of Titanium Microspheres
Potassium doped titanium oxide (KTiO
) nanowires were prepared by the wet corrosion process (WCP) and their photocatalytic effects were systematically characterized. For the synthesis of KTiO
, the potassium hydroxide concentration of the WCP was
varied in order to obtain nanostructures with different surface area and surface charge. Structural and crystalline properties of KTiO
were studied by means of X-ray diffraction, scanning and transmission electron microscopy. Chemical composition was determined by X-ray
fluorescence and energy-dispersive X-ray analysis. Photocatalytic performance was investigated as a function of the surface area, pH, and crystalline structures by studying the degradation of methylene blue, cardiogreen, and azorubine red dyes upon UV irradiation. The negatively charged crystalline
nanostructures with high surface area showed significantly higher photocatalytic degradation compared to their TiO
counterpart. They also showed high efficiency for recovery and re-use. Annealing KTiO
nanostructures improved structural
properties leading to well-ordered layered structures and improved photocatalysis. However, annealing at temperatures higher than 600 °C yielded formation of rutile grains at the surface of nanowires, significantly affecting the photocatalytic performance. We believe that KTiO
nanostructures produced by WCP are very promising for photocatalysis, especially due to their high photocatalytic efficiency as well as their potential for re-use and durability.
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Titanium Core Shell;
Wet Corrosion Process
Document Type: Research Article
Department of Materials Engineering, KU Leuven, B-3001 Leuven, Belgium
Institut für Werkstofftechnik, Universität Bremen, D-28359 Bremen, Germany
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea
Soft Innovative Materials Research Center, Korea Institute of Science and Technology, Wanju, 565-90, Republic of Korea
Department of Physics and Astronomy, KU Leuven, B-3001 Leuven, Belgium
January 1, 2019
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