Photocatalytic activity under UV/Visible light range of Nb-doped titanate nanostructures synthesized with Nb oxide
- Authors
- Byun, Jong Min; Choi, Hye Rim; Kim, Young Do; Sekino, Tohru; Kim, Se Hoon
- Issue Date
- Sep-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Titanate nanostructures; Hydrothermal process; Niobium; Doping; Photocatalytic activity
- Citation
- APPLIED SURFACE SCIENCE, v.415, pp.126 - 131
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 415
- Start Page
- 126
- End Page
- 131
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/18806
- DOI
- 10.1016/j.apsusc.2016.08.132
- ISSN
- 0169-4332
- Abstract
- In this work, using economical and stable niobium oxide (Nb₂O₅) powder as niobium source, visible light responsive Nb-doped titanate nanostructures were synthesized by hydrothermal process. The synthesized Nb-doped titanate nanostructures were composed of two types of titanate nanostructures (nanotubes and nanosheets) and TiO₂ nanoparticles. They have a smaller band gap energy of 3.24 eV compared to pure TNTs that were synthesized under the same experimental conditions. The photocatalytic activity of the synthesized Nb-doped titanate nanostructures was evaluated under visible light irradiation through the degradation of methylene blue (MB) and rhodamine B (RhB). Consequently, the synthesized Nb-doped titanate nanostructures exhibited much higher photocatalytic activity under visible light irradiation than pure TNTs. The photocatalytic activity of the synthesized Nb-doped titanate nanostructures was 1.4 times (MB) and 3.1 times (RhB) higher than of pure TNTs because the Nb-doping narrowed the band gap and it accelerated the separation of photo-induced electron-hole pairs.
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