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- Title
Preparation of Carbon-Nanotube-supported TiO<sub>2</sub> for Enhanced Dye-degrading Photocatalytic Activity.
- Authors
Kim, Sung Phil; Choi, Hyun Chul
- Abstract
Titanium dioxide-carbon nanotube ( TiO2-CNT) nanocomposites were successfully synthesized by a sol-gel method. The prepared TiO2-CNT samples were characterized by transmission electron microscopy ( TEM), X-ray photoelectron spectroscopy ( XPS), and X-ray diffraction ( XRD). The photocatalytic activity of the samples was tested by photodegradation of methylene blue ( MB) and methyl orange ( MO) in aqueous solution under UV-light irradiation. In the photocatalytic results, the TiO2-CNTs, as compared to the pristine TiO2 and commercial P25 TiO2 photocatalysts, exhibited the fastest degradation performance in both dye solutions. The TiO2-CNTs' apparent rate constants were 0.0232 and 0.0214 min-1 in the MB and MO solutions, respectively, both of which are approximately 5 times greater than that for the commercial P25 TiO2 ( MB: 0.0046 min-1, MO: 0.0043 min-1). And as for the estimated electron-transfer resistance ( Rct) results from the ac impedance spectra, the values increased in the following order: TiO2-CNT < P25 TiO2 < pristine TiO2 , indicating that CNTs can serve as electron-transmitting paths, thus suppressing the recombination rate of photogenerated electron/hole pairs. Moreover, the degree of photodegradation inhibition was insignificant in the presence of interfering anion species (1000-fold).
- Subjects
ELECTRIC properties of carbon nanotubes; TITANIUM dioxide spectra; PHOTOCATALYSTS; PHOTOCATALYTIC oxidation kinetics; METHYLENE blue; SYNTHESIS of Nanocomposite materials; SOL-gel processes
- Publication
Bulletin of the Korean Chemical Society, 2015, Vol 36, Issue 1, p258
- ISSN
0253-2964
- Publication type
Article
- DOI
10.1002/bkcs.10060