چكيده به لاتين
Between variety of photocatalysts, Titanium Dioxide (TiO2) attracts a lot of attention to itself, because of its high photocatalytic performance, chemical and biological stability, high optical corrosion resistance and etc. In this project TiO2 was synthesized from Ilmenite precursor, which was extracted from one of the main mines of it in Iran, the Kahnuj mine, and its photocatalytic features was investigated. The goal of this project which it might be a familiar title is reaching to an economical and simple procedure. Besides, TiO2 particles were also synthesized from TiCl4 precursor with comparison purposes. For synthesizing TiO2 from Ilmenite, Hydrothermal method was used. As the first level, the Ilmenite was mixed with NaOH for alkaline roasting, and then washed and filtered. Then, it was leached in HCl for 4 hours, so that TiOCl2 solution was formed. As the next level the formed solution was hydrolysis and formed white sediment was washed and filtered again so that Rutile TiO2 was successfully synthesized with morphology of nanorods with approximate diameter of 50 nm. The HCl concentration and the time of hydrolysis was optimized for this procedure.
In the other hand and as the second part of the project, the TiCl4 was slowly added to some water in zero Celsius Degree. After homogenization and filtration, it was moved into autoclave and was put into oven in 200 ˚C. After cooling time, Rutile TiO2 particles was formed in the autoclave as the white sediments. The Rutile particles synthesized from this was in the same morphology and the same particle size as the first sample, but with more length.
As the last level, both synthesized samples were mixed with 20 ppm methylene blue solution separately, and then were exposed under UV radiation. As the result, it was obtained that the sample synthesized from Ilmenite precursor has a better photocatalytic performance than the other sample. This better performance could be related to the higher amount of the specific surface of the sample synthesized from Ilmenite which was determined by BET results.
