Photocatalytic evaluation of composites of Ba3Li2Ti8O20-CuO in the reduction of CO2 to formaldehyde under visible light irradiation

Ba3Li2Ti8O20 photocatalytic activity for formaldehyde production was compared under different synthetic sol gel conditions (pH). Structural, morphological, optical and electrochemical characterization was performed to materials in order to correlate its properties with the photocatalytic activity. Neutral sol gel synthesis had the highest formaldehyde production (11.6 μmol/gh) attributed mainly to its lower particle size distribution and higher surface area compared to the others, allowing an increasing in the CO2 adsorption. This photocatalytic activity was enhanced with the deposition of CuO particles assisted by microwaves, creating an n-p heterojunction with higher surface area and increasing the formaldehyde production 50 times in the sample synthesized by solid state (50 μmol/gh). © 2018 Elsevier B.V.

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