Abstract
The conversion of CO2 into new carbon-based products, such as fuels and chemicals, is an attractive and promising means of mitigating global energy needs and minimizing environmental damage. Although bismuth tungstate (Bi2WO6) as a photocatalyst can promote CO2 photoreduction, a systematic study for the development of a low-cost and efficient catalyst is needed. Thus, Bi2WO6 with different morphologies was successfully synthesized using the hydrothermal method. An experimental design was applied to investigate the effect of synthesis time and PVP (polyvinylpyrrolidone) concentration on catalyst photocatalytic activity. Crystal structures, morphologies, optical absorption, and surface charges of the catalysts were characterized by X-ray diffraction, scanning electron microscope, UV–vis diffuse-reflection spectroscopy, nitrogen adsorption, and zeta potential. All samples exhibited good performance for the photoreduction of CO2 into ethanol, and both time and PVP concentration were significant in the ethanol yield. Changes in synthesis conditions induced differences in catalyst characteristics, such as morphology, crystallinity, and, predominantly, surface area. Furthermore, PVP addition improved photocatalytic efficiency by up to 258% compared with results without the surfactant. The best sample, W-8h-10%, presented a flower-like morphology and ethanol yield of 68.9 μmol g−1 h−1.
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The authors gratefully acknowledge the financial support of CAPES and CNPq.
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Ribeiro, C.S., Lansarin, M.A. Enhanced photocatalytic activity of Bi2WO6 with PVP addition for CO2 reduction into ethanol under visible light. Environ Sci Pollut Res 28, 23667–23674 (2021). https://doi.org/10.1007/s11356-020-10765-5
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DOI: https://doi.org/10.1007/s11356-020-10765-5