Journal of Ceramic Processing Research

Ceramic Processing Research Center (한양대학교 세라믹연구소)
권호 표지

Effect of calcination temperature on photocatalytic activities of Er-TiO2 nanotubes

  • Song, Yo-Seung (Department of Materials Engineering, Korea Aerospace University) ;
  • Lee, Myung-Hyun (Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Bae-Yeon (Department of Materials Science and Engineering, Incheon National University) ;
  • Lee, Deuk Yong (Department of Biomedical Engineering, Daelim University)
  • Published : 2019.04.01

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Abstract

0.7 mol% Er-TiO2 nanotubes were prepared using a sol-gel derived electrospinning and subsequent calcination at intervals of 50 ℃ from 500 ℃ to 650 ℃ to investigate the effect of calcination temperature on the crystal structure and the photocatalytic activity of methylene blue (MB). X-ray diffraction (XRD) results indicated that Er-TiO2 nanotubes calcined at 500 ℃ were composed of anatase only. However, mixed phases of anatase (51%, 55%, 96%) and rutile (49%, 45%, 4%) were observed for the nanotubes calcined at 550 ℃, 600 ℃ and 650 ℃, respectively. As the calcination temperature rose from 500 ℃ to 600 ℃, the Barrette-Emmett-Teller (BET) surface area and degradation kinetic constant increased from 97.77 ㎡/g to 117.62 ㎡/g and from 1.2 × 10-2min-1 to 1.6 × 10-2 min-1, respectively. The Er-TiO2 nanotubes calcined at 600 ℃ exhibited enhanced MB degradation (87%) compared to that of Er-TiO2 nanofibers (37%) due to the synergic combinations of tailored mixed crystals and larger BET area.

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