Abstract
In this work, the advanced photocatalytic system composed of titanium dioxide (P25) and mSFO (Sn-doped magnetite with Fe-doped cassiterite) was designed for the gas phase CO2 reduction process. We have proposed the synthesis route of mSFO composite involving a clean inorganic hydrothermal method supported by the full characteristics of the obtained material by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray fluorescence, Mӧssbauer spectroscopy, scanning electron microscopy, transmission electron microscopy, dynamic light scattering, diffuse reflectance spectroscopy, and porosimetry. The mSFO/P25 system indicates a photocatalytic reduction of CO2 to CO. The activity of the examined photocatalytic system was also confirmed with the use of 13C labeled carbon dioxide. It was established that the formed carbon monoxide is a product of CO2 reduction. The surface photovoltage, electrochemical (linear sweep voltammetry) and photoelectrochemical measurements substantiate the S-scheme mechanism.
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