Abstract. The influence of thermal annealing to TiO2 nanopowders doped with Fe atoms was investigated using coprecipitation method. Fe-doped TiO2 nanopowders were prepared using a cold titanium tetrachloride (TiCl4) and FeCl3. The samples were annealed at various temperatures from 200 o C to 500 o C during 60 minutes. Based on the X-Ray Diffraction results showed that the grain size of Fe:TiO2 nanopowders increased as annealing temperature was increased. This was due to the reducing of FWHM values in the X-RD spectra. FTIR results showed that the spectra were observed at 3417 cm -1 , 2358 cm -1 , 1645 cm -1 , and 518 cm -1 indicating the bond functional groups of O-H bond, C-O bond, O-H bond, and Fe-O bond, respectively. The agglomeration of Fe:TiO2 nanopowders into a large cluster were observed with scanning electron microscopy (SEM) when the samples were annealed at 500 o C.
Titanium dioxide (TiO2) doped with iron (Fe) atom are investigated using X-Ray diffraction, field emission scanning electron microscopy (FESEM), and photocatalysts measurements. Fe-TiO2 nanoparticles with different concentration of iron were formed using the conventional co-precipitation technique from two different chemical solutions. The precursors of TiO2 were prepared using titanium tetrachloride (TiCl4) of 50 ml, and iron trichloride (FeCl3) was used as a dopant source. X-ray diffraction results show that diffraction pattern have two phases structures anatase and rutile phase structures where the intensity of the rutile structures are superior to that the anatase phase intensities. The results from FESEM micrograph indicate that the agglomerations were taken place, forming into clusters. Irradiation of ultraviolet (UV) with varying the time from 30 minutes to 120 minutes to the Fe-doped TiO2 nanoparticles using methylene blue shows that the absorption intensity reduces as time irradiation increased. The results indicate that the TiO2 nanoparticles doped with iron are suitable as photocatalysts.
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