چكيده به لاتين
Titanium oxide is one of the most widely used photocatalysts due to its high thermal stability, non-flammability, poor solubility, non-toxicity and natural origin. In this research, titanium oxide has been synthesized by solution combustion method, which is a simple and low-cost route with the ability to produce materials with superior properties. The effect of fuels such as: citric acid, glycine, CTAB as well as the mixture of these fuels at different oxidizing fuel ratios (φ = 1,2,3) were studied and then samples were calcined at 500 ° C for one hour. X-ray diffraction (XRD) analysis, Raman spectroscopy, scanning electron microscopy (SEM), differential reflectance spectroscopy (DRS) and specific surface area (BET) analysis were acquired to characterize nanoparticles properties. Ultraviolet-absorption (UV-Visible) and photoluminescence (PL) spectroscopy were used to evaluate the optical properties.
Different combinations and amounts of fuel to oxidant ratio were used to change the combustion conditions, including temperature, amount and composition of the combustion gas. Due to the suitable and porous morphology as well as the higher specific surface area in the samples synthesized with citric acid fuel, this type of fuel was selected as a suitable fuel. The results obtained for citric acid fuel with different ratio of fuel to oxidants, indicate the superiority of photocatalytic performance, crystallinity, high purity, greater porosity and finer grain size in the SEM images and less bandgap energy than other samples at ɸ = 1. In this sample, about 90% of the methylene blue was degraded in just 60 minutes. Studies were also performed on other organic dyes, including rhodamine B and methyl orange, which had lower degradation rates over the same period.
