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

Title
Characterization and Photocatalytic Performance of Potassium-Doped Titanium Oxide Nanostructures Prepared via Wet Corrosion of Titanium Microspheres
Authors
손동익So Yoon LeeJie ZhangLee-Woon JangYujie GuoZhihong ZhangSamir SalamehSanghoon KimVijay Shankar RangasamySavitha ThayumanasundaramJean-Pierre LocquetJin Won Seo
Keywords
KTiOx; Titanium Core Shell; Nanostructures; Photocatalysis; Wet Corrosion Process
Issue Date
2019-01
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 19, NO 1-374
Abstract
Potassium doped titanium oxide (KTiOx nanowires were prepared by the wet corrosion process (WCP) and their photocatalytic effects were systematically characterized. For the synthesis of KTiOx, 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 KTiOx 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 KTiOx nanostructures with high surface area showed significantly higher photocatalytic degradation compared to their TiOx counterpart. They also showed high efficiency for recovery and re-use. Annealing KTiOx 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 KTiOx 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.
URI
http://pubs.kist.re.kr/handle/201004/69015
ISSN
1533-4880
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KIST Publication > Article
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