Abstract
The photocatalytic reduction of carbon dioxide (CO2) on jet spray formed titanium dioxide (TiO2) was studied using light-emitting diode (LED) illumination centred at a wavelength of 388nm. In addition, the photocatalytic reduction of CO2 under soft X-ray irradiation was also studied. Specifically, the experiments examined the reduction of CO2 in a gaseous and liquid–gas system using residual gas analysis mass spectrometry. A photochemical reduction of CO2 was observed over a course of 250min, with transformation to a major product, C2H3O− (ethenolate), until equilibrium was reached. The product was observed to be surface stabilised, with it reverting back to CO2 over the course of 100min without illumination. A proposed free radical mechanism is presented for the formation of this product. A similar effect to that of UV illumination is also observed to occur under the influence of soft X-rays, which presents a potentially significant alternative method for the activation of TiO2.
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