Synthesis of TiCh photocatalyst was performed from 12.8 …show more content…
Solution A consisted of 20 mL of TBT dissolved in 20 mL of anhydrous ethanol. Afterwards, 20 ml of 3 M acetic acid was drop-wise added into solution that was stirred for 15 min. Solution B consisted of 2.1 mL of DDAC was mixed with 60 mL anhydrous ethanol and 20 mL distilled water and stirred for 15 min at room temperature. Then, the solution B was drop-wise added into the solution A. The resultant mixture was stirred for 45 min with high speed disperser (7500 rpm) than transferred in an Erlenmeyer flask and heated at 85 °C in an oven for 24 h until a transparent sol was obtained. The obtained sample was then washed several times with distilled water and dried at 100 ºC for 12 h. Finally, the samples were calcined for 3 h at the following temperatures: 400 °C, 500 °C, 600 …show more content…
The band at 2350 cm-1 originates from the CO2 in the air [29]. The broad absorption bands that appear in the low frequency region of infrared spectrum, located in the range 450-850 cm−1 are characteristic of a Ti-O-Ti symmetric stretching vibration mode [4] and observed maximum at around 500 cm-1 corresponding to the stretching vibration of Ti-O, which are formed during condensation reaction of sol-gel synthesis. The most significant vibrational bands of TiO2 appears in the range 647 cm−1 to 830 cm-1, correspond to TiO2 modes in the anatase phase and change in absorbance intensity with higher calcined temperatures indicate change of crystallinity, less well-defined anatase crystals [5] as observed for the studied samples,