چكيده به لاتين
In this work, nanostructures of titanium dioxide were synthesized and compared for their photocatalytic and adsorption properties. For this purpose, titanium dioxide powder of the anatase phase and mean particle size of 0.13 µm as precursor and 10 M alklaine solutions of sodium hydroxide, potassium hydroxide and their mixtures at different molar ratios were used. Time of synthesis was considered constant at 24 h in all the cases and temperatures of synthesis and calcination were selected at 3 (110, 155, and 200 ˚C) and 2 (450 and 700 ˚C) different levels, respectively according to the literature. The synthesized samples were then compared to each other for their photocatalytic and adsorption properties. The best performance for adsorption property was achieved in the sample synthesized at equal molar ratio of sodium and potassium hydroxides (5 M : 5 M) at 155 ˚C. The same sample when calcined at 700 ˚C exhibited the highest photocatalytic property. The highest adsorption capacity for methylene blue was 96 mg/g and the maximum degradation efficiency for RhB under UV light was 93%.
The selected samples were then characterized using SEM, BET, XRD, DRS and FTIR techniques. According to microscopy studies, the selected samples exhibited a nano-rod morphology with a mean diameter size of approximately 30 nm.
