Anodization of bismuth doped TiO2 nanotubes composite for photocatalytic degradation of phenol in visible light
- Authors
- Ali, Imran; Kim, Seu-Run; Kim, Sung-Pil; Kim, Jong-Oh
- Issue Date
- Mar-2017
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Anodization; Bismuth doping; TiO2 nanotubes; Organic pollutant; Phenol; Photocatalytic degradation
- Citation
- Catalysis Today, v.282, pp.31 - 37
- Indexed
- SCIE
SCOPUS
- Journal Title
- Catalysis Today
- Volume
- 282
- Start Page
- 31
- End Page
- 37
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4809
- DOI
- 10.1016/j.cattod.2016.03.029
- ISSN
- 0920-5861
- Abstract
- Bismuth doped TiO2 photocatalyst was synthesized in a one-step electrochemical anodization method. Bismuth nitrate Bi(NO3)(3) was used as a bismuth source. The obtained samples were characterized by FE-SEM, XRD, EDX and XPS. The optimum synthesis conditions for bismuth doping were 1.0 M bismuth nitrate in an ethylene glycol electrolyte with anodization at 40 V for 2 h. Compared with undoped TiO2 nanotubes, bismuth doped TiO2 photocatalyst showed a higher photocatalytic activity by a factor of 4.0 for phenol degradation under visible light irradiation. The optimum phenol degradation using a photo-electrocatalytic method was observed at a 0.5 V external bias, and this degradation rate was 5.2 times faster than that observed for undoped TiO2 nanotubes. The doped bismuth TiO2 nanotubes are favorable for the separation of photo-induced electrons and holes, reducing the recombination of charges, and promoting the formation of hydroxyl radicals and superoxides that degrade phenol.
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