Lab Experiment: Lab Analysis Of Tiv Photocatalysts

1084 Words 5 Pages
TiV photocatalyst was prepared by sol–gel method using tetra-n-butyl titanate as the precursor. Solution A was prepared by dissolving 17 mL TBT in 30 mL anhydrous ethanol with stirring (300 rpm) for 30 min. The other solution that contained 28.35 mL anhydrous ethanol, 7.25 mL deionized water and 20 mL 3 M acetic acid was slowly added into the above solution with magnetic stirring at room temperature. The prepared mixture was further hydrolyzed for 60 min with stirring until the transparent sol was obtained, which was aged for 20 h at room temperature. Thus prepared TiO2 was dried at 80 °C in an oven for 12 h and calcined for 3 h at three different temperatures: 400 °C, 500 °C, 600 °C.
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,

Related Documents