Synthesis, characterization and photocatalytic application of TiO2 nanosized particles / by Dongliang Liao.
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"In this thesis, effects of surfactant composition and concentration on shape, size, zeta potential, and photocatalytic activity of TiO2 nanosized particles are reported. Spherical, cubic, rod, ellipse and leaf-like shaped TiO2 nanosized particles were obtained with the addition of different surfactants in various composition and concentrations during preparation. The results show that the shape and size of the TiO 2 nanosized particles depend on not only surfactant composition but also surfactant concentration. The pH dependence of zeta potential of TiO2 nanosized particles was studied. A unique finding is that TiO2 nanosized particles shaped by sodium dodecyl sulfate (SDS) have two isoelectric points (IEPs), while other shape-controlled TiO2 nanosized particles have only one IEP. At neutral pH, shape-and size-controlled TiO2 nanosized particles have a more negative zeta potential than TiO2 nanosized particles obtained without the addition of surfactants during synthesis and commercial anatase TiO2 nanosized particles Degussa P-25. Different zeta potential values are observed for TiO2 nanosized particles obtained with the addition of different surfactants during preparation.