Utilization from ultraviolet to infrared light for CO2 reduction with P4O10/TiO2 photocatalyst

Abstract

This study aims to extend the light spectrum which could be absorbed by TiO2 to infrared ray light (IR) by loading P4O10 in order to promote the CO2 reduction performance of TiO2 photocatalyst. Three ranges of light with P4O10/TiO2 film are studied, which are ultra violet light (UV) + visible light (VIS) + IR, VIS + IR, and IR only. This study also investigates the impact of molar ratio of CO2/H2O or CO2/NH3 on the CO2 reduction characteristics of P4O10/TiO2 film. The largest CO2 reduction performance in case of CO2/H2O and CO2/NH3 is obtained at CO2:H2O = 1:1 and CO2:NH3 = 3:2 respectively, irrespective of light illumination condition. With IR light illumination only, the largest molar quantity of CO per unit weight of photocatalyst for P4P10/TiO2 film in case of CO2/H2O and CO2/NH3 is 2.36 mmol/g and 33.4 mmol/g, respectively.

Heat-Transfer Analysis of the Promotion of the CO2 Reduction Performance of a P4O10/TiO2 Photocatalyst Using a Black Body Material

“…The measurement accuracy of the thermocouple used in the authors' previous study [15] was 0.1 • C. In addition, the temperatures, which were measured for 10 min using the thermocouple [15], were applied in this study. In this study, the illumination time of the Xe lamp for the photocatalytic CO 2 reduction experiment was 8 h, which was in keeping with the authors' previous studies [12][13][14][15]. According to the authors' previous work, the formation rate of CO attains its maximum value at approximately 2 h of Xe illumination and decreases gradually.…”

“…In previous studies [12,13], the authors prepared P 4 O 10 /TiO 2 , which successfully extended the absorbed wavelength of light up to IR. Under IR illumination, the largest molar quantity of CO per unit weight of photocatalyst for the P 4 O 10 /TiO 2 film in the case of CO 2 /H 2 O was 2.36 µmol/g, while that in the case of CO 2 /NH 3 was 33.4 µmol/g [12,13].…”

CO2 Reduction Performance with Double-Layered Cu/TiO2 and P4O10/TiO2 as Photocatalysts under Different Light Illumination Conditions

“…Hierarchical ZnIn 2 S 4 nanorods, prepared using the solvothermal method, exhibited the production performance of CO of 54 µmol/g and CH 4 of 9 µmol/g [25]. According to the authors' previous studies [26], P 4 O 10 /TiO 2 has been investigated. The largest molar quantity of the CO per unit weight of the photocatalyst for P 4 O 10 /TiO 2 film in the case of CO 2 /H 2 O was 2.36 µmol/g under the light illumination condition with IR, while that in case of CO 2 /NH 3 was 33.4 µmol/g [26].…”

“…Cu is a promising dopant for expanding the light absorption to VIS since many previous studies have reported its good performance [13][14][15][16][17][18]. In addition, P 4 O 10 is also a promising dopant to expand the light absorption to IR since previous studies carried out by authors have reported its good performance [26]. However, there is no study to clarify the impact of the combination of the photocatalyst absorbing the light with VIS as well as that with IR.…”

“…The pulse number of Cu for preparing Cu/TiO 2 was 200, which followed the optimum pulse number decided by the authors' previous study [17]. P 4 O 10 /TiO 2 has been prepared by sol-gel and the dip-coating processes following the authors' previous studies [26].…”