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Title: Effects of various TiO2 nanostructures and graphene oxide on photocatalytic activity of TiO2
Authors: Gao, Peng
Li, Anran
Sun, Darren Delai
Ng, Wun Jern
Keywords: DRNTU::Engineering::Environmental engineering::Water treatment
DRNTU::Engineering::Materials::Nanostructured materials
Issue Date: 2014
Source: Gao, P., Li, A., Sun, D. D., & Ng, W. J. (2014). Effects of various TiO2 nanostructures and graphene oxide on photocatalytic activity of TiO2. Journal of hazardous materials, 279, 96-104.
Series/Report no.: Journal of hazardous materials
Abstract: The nanostructures of TiO2 significantly affect its photocatalytic activity. In this work, various TiO2 nanostructures have been successfully synthesized, including one-dimensional (1D) TiO2 nanotube, 1D TiO2 nanowire, three-dimensional (3D) TiO2 sphere assembled by nanoparticles (TiO2 sphere-P) and 3D TiO2 sphere assembled by nanosheets (TiO2 sphere-S). The results of photodegradation activity towards acid orange 7 (AO7) indicate that the photodegradation efficiency of TiO2 sphere-S is the highest among the investigated TiO2 nanostructures, even though the specific surface area of TiO2 sphere-S is lower than that of TiO2 nanotube. The best photodegradation activity of TiO2 sphere-S can be attributed to the highest light harvesting capacity resulted from multiple reflections of light, and hierarchical mesoporous structure. In addition, the combination of TiO2 sphere-S with graphene oxide (GO) sheets can further enhance the photodegradation efficiency of AO7 and disinfection activity of Escherichia coli (E. coli) under solar light, which is more energy efficient. The promising photocatalytic activity of GO-TiO2 composites is originated from the enhanced light absorption and efficient charge separation. Hence, this study paves a way for improving the performance of other photocatalysts.
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2014.06.061
Rights: © 2014 Elsevier B. V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Hazardous Materials, Elsevier B. V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
MSE Journal Articles

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