INOR 303 |
| Titania (TiO2) fibers were prepared by electrospray of solution of titanium tetra isopropoxide and polyvinyl acetate in dimethylformaldehide followed by drying and calcination. The complete removal of the polymer was achieved and the transition from anatase titania to rutile finished, below and right above 600oC, respectively. While the fibers remained porous immediately following the removal of polymers, they became composed of facetted crystals whose size increased with the temperature of calcination. The inclusion of metal (e.g., silver, copper and nickel) precursors into the precursor solution resulted in well metal-dispersed titania fibers. The crystallite size of the metal did not increase appreciably with the increase of the calcination temperature. Post impregnation of metals was also performed on the calcined titania fibers. Photocatalysis of decompositions of methylene blue and phenol with the fibers either unmodified or modified with metals or other additives such as dyes were investigated with ultraviolet and visible range of light. The feasibilities of direct preparations of catalyst beds and films by electrospray were also discussed. |
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Synthesis and Characterization of Materials
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |