1 EXPERIMENTAL STUDY TOWARDS FABRICATION OF SPRAY-DRIED PHOTOCATALYTIC TITANIUM DIOXIDE FILMS FOR WATER TREATMENT

Doped TiO2 were milled and then processed into powder using a spray dryer. The powder was dried overnight and then heat treated (calcined) at different temperatures for 4 hours. Characterization of doped TiO2 was done using Field Emission Scanning Electron Microscope for size and morphology determination; X-Ray Diffractometer for crystallinity analysis; and FT Raman Spectrometer for Raman spectroscopic analysis. As calcination temperature went up, rutile phase increased with increased crystallite size in commercial (Degussa P25) TiO2 but it was not observed in the doped sample. The crystallite size and diffraction peak intensity of the doped (anatese) TiO2 increased as calcination temperature went up. Diffraction peaks for talc disappeared after milling (i.e grinding process). Two new RAMAN bands started to emerge at 1926 and 1498 cm 1 starting at temperature 750°C and showed significant peaks at 950°C due to presence of talc or its constituents in the doped sample. This requires further study an