Phenol degradation using an anodized graphene-doped TiO2 nanotube composite under visible light
- Authors
- Kim, Seu-Run; Ali, Imran; Kim, Jong-Oh
- Issue Date
- May-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Phenol degradation; Visible light; Anodization; RGO-TNTs; Photocatalyst
- Citation
- APPLIED SURFACE SCIENCE, v.477, pp 71 - 78
- Pages
- 8
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 477
- Start Page
- 71
- End Page
- 78
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2220
- DOI
- 10.1016/j.apsusc.2017.12.024
- ISSN
- 0169-4332
1873-5584
- Abstract
- TiO2 nanotubes (TNTs) were doped with reduced graphene oxide (RGO) via anodization. The synthesized catalyst was characterized by FE-SEM, XRD, AES, PL, Raman, and UV-vis DRS. We have synthesized the catalyst with different RGO doping time and RGO concentration. The optimum synthesis conditions for RGO doping were a 0.5 g L-1 RGO anodization at 60 V for 1 min. Compared with un-doped TNTs, the RGO-doped TNT photocatalyst showed a 3.8-fold higher photocatalytic activity, while phenol degradation under visible light irradiation. Optimum phenol degradation was observed at an external bias of 0.5 V using a photoelectrocatalytic method, and this degradation rate was 3.5-fold higher than that observed for un-doped TNTs. The intermediate products of phenol were also analyzed using TD-GC-MS method to evaluate the phenol degradation pathways. The RGO-doped TNTs reduced the recombination of photo-induced e- and h(+) and thus increased the formation of the OH radicals and superoxides that degrade phenol.
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