Facile solvo-hydrothermal synthesis of Bi₂MoO₆ for the photocatalytic reduction of CO2 into ethanol in water under visible light

Ribeiro, Camila Silva and Azário Lansarin, Marla (2019). Facile solvo-hydrothermal synthesis of Bi₂MoO₆ for the photocatalytic reduction of CO2 into ethanol in water under visible light. Reaction Kinetics, Mechanisms and Catalysis, 127(2) pp. 1059–1071.

DOI: https://doi.org/10.1007/s11144-019-01591-z

Abstract

Bi₂MoO₆ photocatalysts were synthesized by the hydro- and solvothermal methods. Using diferent solvents, pH values of the precursor suspensions and temperature during synthesis were tested, by and experimental design, to investigate the efect of these variables on the catalysts’ photocatalytic activity. To evaluate and compare the physical properties of the samples, X-ray difraction analysis, SEM, BET measurements, UV–vis spectroscopy and zeta potential were applied. The results revealed that the pH is the statistically signifcant variable more important for both solvents and diferences in catalysts characterizations, like morphology and crystallinity, were found with the solvents change. The as-synthesized samples exhibited good performance for the photoreduction of CO₂ into ethanol in liquid phase. The yields of ethanol obtained over Bi₂MoO₆–H₂O and Bi₂MoO₆–EG/Et catalysts, under the optimal conditions, were 34.44 and 24.43 µmol g⁻¹ h⁻¹, respectively.

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