Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 89, Issue 3-4, Pages 425-431Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2008.12.025
Keywords
Photoelectrical catalysis; Fullerene; TiO2 nanotube array; Methylene blue
Funding
- Chinese National Science Foundation [20673065]
- National Basic Research Program of China [2007CB613303]
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Fullerene (C-60)-modified TiO2 nanotube array (TNA) was prepared by the electrophoresis deposition technique. The as-prepared samples showed the high efficiency for the photoelectric catalytic (PEC) degradation of nonbiodegradable azodyes methylene blue (MB). The highest PEC activity of C-60-modified TNA (TNA/C-60) was achieved at a lower bias potential (4.0 V), which was 2.3 times of the highest activity of TNA at 5.0 V. The high PEC activity came from the synergetic effect between C-60 and TiO2, which promoted the charge separation, influenced the charge distribution of the electrical double layer and reduced the impedances of the Helemholtz and depletion layers. Moreover, the oxidation of MB was a quick process during the PEC degradation, and the process began with the oxidation of the dimethylamino group, which was different from the photocatalytic (PC) process began with the oxidation of S atom; MB was mineralized completely during PEC degradation. (C) 2009 Published by Elsevier B.V
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