Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 194, Issue 1, Pages 11-19Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2007.07.008
Keywords
TiO2/ZnO composite nanoparticles; shape control; photocatalytic activity
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The shape and size of TiO2/ZnO composite nanoparticles can be manipulated by introducing surfactants and different Zn/Ti(OBu)(4) molar ratios during the synthesis process. Different sizes of spherical TiO2/ZnO composite nanoparticles are obtained when sodium dodecyl benzene sulfonate (DBS) and different Zn/Ti(OBu)(4) molar ratios are used. Cubic TiO2/ZnO composite nanoparticles, hexagonal nanorods, and nanobelts are obtained when sodium dodecyl sulfonate (SDS) and different Zn/Ti(OBu)(4) molar ratios are used. The XRD study shows that there is no obvious difference in crystal composition of various shapes of TiO2/ZnO composite nanoparticles. The photocatalytic degradation of methyl orange shows significant variation in rate that decreases in the order: TiO2/ZnO composites >TiO2 (with surfactant but no Zn) >TiO2 (without surfactant and Zn). An optimal Zn/Ti(OBU)4 molar ratio of 0.25:1 is found to achieve the highest photocatalytic activity of TiO2/ZnO composite nanoparticles. (C) 2007 Elsevier B.V. All rights reserved.
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