Impact of Rotation Speed of Ball Milling on P4O10 Size Thus on Promotion of CO2 Reduction Performance with P4O10/TiO2 Photocatalyst

The aim of this study is to investigate the impact of the rotation speed of ball milling on the CO2 reduction performance of P4O10/TiO2. The rotation speeds studied were 600 rpm, 400 rpm and 200 rpm. It is revealed that the particle size of P4O10 within P4O10/TiO2 prepared at the rotation speed of 600 rpm was the smallest among the investigated rotation speeds. It is revealed that the concentration of formed CO, as well as the molar quantity of CO per unit weight of photocatalyst P4O10/TiO2, prepared at the rotation speed of 600 rpm in the case of CO2:H2O = 1:1 was the highest among the different molar ratios irrespective of light illumination condition. In the case of CO2:H2O = 1:1 under the light illumination conditions of UV and VIS and IR, VIS and IR, and IR, the following findings were obtained: The molar quantity of CO per unit weight of photocatalyst prepared at 600 rpm was 25.2 μmol/g under the light illumination condition of UV and VIS and IR, which was 20.3% more than that prepared at 400 rpm and 20.6% more than that prepared at 200 rpm. The molar quantity of CO per unit weight of rotation speed of 600 rpm under the light illumination condition of VIS and IR was 18.4 μmol/g, which was 21.3% more than that prepared at 400 rpm and 38.7% more than that prepared at 200 rpm. The molar quantity of CO per unit weight of photocatalyst prepared at 600 rpm was 11.9 μmol/g under the light illumination condition of IR, which was 1.8% more than that prepared at 400 rpm and 8.2% more than that prepared at 200 rpm.