期刊
CERAMICS INTERNATIONAL
卷 38, 期 7, 页码 5791-5797出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.04.026
关键词
TiO2 nanotube arrays; Anodic oxidation; Photocatalytic reaction; Methyl orange
资金
- National Science Foundation of China [NSFC 50672089, 51172218]
- Program for New Century Excellent Talents in University [NCET-08-0511]
- Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province [BS2010CL049]
TiO2 nanotube arrays were successfully prepared by anodic oxidation method in the electrolyte of ethylene glycol and deionized water mixed in 9:1 volumetric ration including 0.5 wt.% NH4F. The microstructure and phase compositions of samples annealing from 0 degrees C to 800 degrees C were characterized by field-emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). FESEM showed that the obtained nanotubes with diameter 80-100 nm and length 4.89 mu m were highly ordered and perpendicular to Ti substrate. The tubular structure collapsed at 680 degrees C. The photocatalytic activity of samples annealing at different temperature were calculated by the degradation of a model dye, methyl orange (MO), under UV light illumination. The results indicated the phase composition and the morphology of TiO2 nanotubes both played an important role in the degradation of MO. In addition, the effects of initial solution pH and dye concentration on degradation of MO had also been investigated. As a result, the optimum values of calcination temperature, initial solution pH and dye concentration were found to be 550 degrees C, 3, 10 mg/l, respectively. The best photodegradation of MO was 76% under illumination for 3 h. C) 2012 Published by Elsevier Ltd and Techna Group S.r.l.
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