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Characterization and Photocatalytic Performance of Potassium-Doped Titanium Oxide Nanostructures Prepared via Wet Corrosion of Titanium Microspheres

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Potassium doped titanium oxide (KTiO x ) nanowires were prepared by the wet corrosion process (WCP) and their photocatalytic effects were systematically characterized. For the synthesis of KTiO x , 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 x 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 KTiO x nanostructures with high surface area showed significantly higher photocatalytic degradation compared to their TiO x counterpart. They also showed high efficiency for recovery and re-use. Annealing KTiO x 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 x 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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Keywords: KTiOx; Nanostructures; Photocatalysis; Titanium Core Shell; Wet Corrosion Process

Document Type: Research Article

Affiliations: 1: Department of Materials Engineering, KU Leuven, B-3001 Leuven, Belgium 2: Institut für Werkstofftechnik, Universität Bremen, D-28359 Bremen, Germany 3: Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Republic of Korea 4: Soft Innovative Materials Research Center, Korea Institute of Science and Technology, Wanju, 565-90, Republic of Korea 5: Department of Physics and Astronomy, KU Leuven, B-3001 Leuven, Belgium

Publication date: January 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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