Abstract
Cu-doped TiO2 (Cu/TiO2) film photocatalyst was prepared by combination of sol-gel and dip-coating process and pulse arc plasma method. The effect of Cu/TiO2 photocatalyst on CO2 reduction performance with reductants of H2O and H2 or NH3 was investigated. In addition, the overlapping two Cu/TiO2 coated on netlike glass discs were also investigated. The CO2 reduction performance of Cu/TiO2 film was tested under illumination of Xe lamp with or without ultraviolet (UV) light, respectively. As to the condition of CO2/H2/H2O, the best CO2 reduction performance has been achieved under the condition of CO2/H2/H2O = 1:0.5:0.5 with UV light illumination as well as without UV light illumination. The theoretical molar ratio of CO2/H2O or CO2/H2 to produce CO is 1:1. Since the molar ratio of CO2/H2/H2O = 1:0.5:0.5 can be regarded as the molar ratio of CO2/total reductants = 1:1, it is believed that the results of this study follow the reaction scheme of CO2/H2O and CO2/H2. On the other hand, as to the condition of CO2/NH3/H2O, the best CO2 reduction performance has been achieved under the condition of CO2/H2/H2O = 1:1:1 with UV light illumination as well as without UV light illumination.
Highlights
Paris Agreement adopted in 2015 sets the goal that the increase in average temperature in the world from the industrial revolution by 2030 should be kept less than 2 K
The present study has investigated if two layers of two Cu-doped TiO2 (Cu/TiO2) coated on netlike glass fiber put on the top of the other, what impact/improvement would be on the CO2 reduction performance
After confirming the pressure and gas temperature in the reactor at 0.1 MPa and 298 K, respectively, the NH3 aqueous solution (NH3; 50 vol%), which was changed according to the planed molar ratio, was injected into the reactor through gas sampling tap, and Xe lamp illumination was turned on the same time
Summary
Paris Agreement adopted in 2015 sets the goal that the increase in average temperature in the world from the industrial revolution by 2030 should be kept less than 2 K. Noble metal doping such as Pt, Pd, Au and Ag [11], Au, Pd-three dimensionally ordered macroporous TiO2 [12], composition materials formed by GaP and TiO2 [13], nanocomposite CdS/TiO2 combining two different band gap photocatalysts [14], and carbon-based AgBr nanocomposited TiO2 [15], had been attempted to overcome the shortcomings of the pure TiO2 They could improve the CO2 reduction performance; the concentrations in the products achieved in all the attempts so far were still low, ranging from 1 to 150 μmol/g-cat [11–16]. Though a few studies using pure TiO2 under CO2/H2/H2O condition were reported [24, 26], the effect of ratio of CO2, H2 and H2O or NH3 as well as the effect of Cu doping with TiO2 on CO2 reduction performance of photocatalyst were not investigated previously. The CO2 reduction performance with H2O and H2 or NH3 using Cu/TiO2 coated on netlike glass fiber as photocatalyst under the condition of illuminating Xe lamp with or without UV light was investigated. The effect of overlapping two layers of Cu/TiO2-coated netlike glass fiber on CO2 reduction performance with H2 and H2O was investigated
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