Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 173, Issue 1-3, Pages 539-543Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.08.119
Keywords
Titania; Hollow microsphere; Nanoparticles; Surface fluorination; Photocatalytic degradation
Categories
Funding
- National Natural Science Foundation of China [50625208, 20773097, 20877061]
- Natural Science Foundation of Hubei Province [2008CDB265]
- China Postdoctoral Science Foundation [20090451086]
- National Basic Research Program of China [2007CB613302]
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To study the synergistic effects of hollow structure and surface fluorination on the photoactivity of TiO(2), TiO(2) hollow microspheres were synthesized by a hydrolysis-precipitate method using sulfonated polystyrene (PS) as templates and tetrabutylorthotitanate (TBOT) as precursor, and then calcined at 500 degrees C for 2 h. The calcined samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N(2) sorption. Photocatalytic activity was evaluated using reactive brilliant red X3B, an anionic organic dye, as a model pollutant in water. The results show that the photocatalytic activity of TiO(2) hollow microspheres is significantly higher than that of TiO(2) nanoparticles prepared in the same experimental conditions. At pH 7 and 3, the apparent rate constants of the former exceed that of the latter by a factor of 3.38 and 3.15, respectively. After surface fluorination at pH 3, the photoactivity of hollow microspheres and nanoparticles further increases for another 1.61 and 2.19 times, respectively. The synergistic effect of surface fluorination and hollow structure can also be used to prepare other highly efficient photocatalyst. (C) 2009 Elsevier B.V. All rights reserved.
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