Speaker
Mr
Olatunbosun Nubi Nubi
(University of Limpopo)
Description
The large band-gap of Titania, and the high recombination of photogenerated charge carriers that limit its overall photocatalytic efficiency, prompted the systematic investigation of copper and silver, doped and codoped, TiO2 nanocatalysts. In the study, four different TiO2 nanopowder species, namely undoped, Cu-doped, Ag-doped and Cu+Ag-doped, were fabricated via the sol-gel route for the activity assessment. After drying at 100oC, the powder samples were annealed for one hour at temperatures of 300oC, 600oC, 900oC and 1100oC. Analysis by XRD revealed that TiO2 was effectively doped, and that the anatase – rutile mixed-phase occurred around 600oC. Brookite-bearing, mixed‐phases (anatase – brookite, brookite – rutile) appeared in the 300oC and 600oC of the codoped samples. UV-vis indicated a shift of the absorption edge to a lower energy and a stronger absorption in the visible light region for these two samples, the highest quantum efficiency being induced by the former. Photoluminescence (PL) spectroscopy suggests that these high activity photocatalysts produced lower PL spectra intensities. The visible emission observed were attributed to the enhancement of oxygen and Ti vacancies by the presence of the brookite phase.
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Primary authors
Mr
Olatunbosun Nubi Nubi
(University of Limpopo)
Dr
Thuto Mosuang
(University of Limpopo)
