Effect of shape-driven intrinsic surface defects on photocatalytic activities of titanium dioxide in environmental application
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© 2017 Elsevier B.V. This study investigated the effect of TiO 2 morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO 2 particles, nano-granular TiO 2 particles (TiNP) and TiO 2 nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO 2 particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.
author list (cited authors)
Yoon, S. H., ElShorafa, R., Katbeh, M., Han, D. S., Jeong, H. W., Park, H., & Abdel-Wahab, A.