Journal
MATERIALS LETTERS
Volume 106, Issue -, Pages 41-44Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2013.04.079
Keywords
Electrospun; TiO2 fibers; Hydrothermal reaction; Calcination treatment; Photocatalyst
Funding
- Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korea Government Ministry of Knowledge Economy [201140100090]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [R13-2008-010-00000-0]
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Crystalline TiO2 fibers were fabricated using a hydrothermal reaction or calcination treatment from titanium isopropoxide/poly(methyl methacrylate) fibers prepared using a sol-gel method and an electrospinning technique. The samples were characterized using thermogravimetric analysis, field-emission scanning electron microscopy, and X-ray diffraction. The TiO2 fiber prepared by hydrothermal reaction than calcinations treatment could be obtained to anatase phase of the small crystallite size. The crystallites size of the hydrothermal-185, calcination-450, and calcination-500 were 6.28, 12.80, and 15.39 nm, respectively. These photocatalysts were evaluated based on the photodecomposition of methylene blue under ultraviolet light. The photocatalytic degradation rate followed a pseudo-first-order equation. The kinetic constant (k(1)) of the hydrothermal-185, calcination-450, and calcination-500 samples were 7.40 x 10(-3), 2.21 x 10(-2), and 1.55 x 10(-2), respectively. The TiO2 fibers prepared using calcination treatment had higher efficiencies than those prepared using a hydrothermal reaction, but the TiO2 fibers prepared without calcination treatment could be used as photocatalysts. (C) 2013 Elsevier B.V. All rights reserved.
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