Artificial photosynthesis for alcohol and 3-C compound formation using BiVO4-lamelar catalyst. Issue 36 (February 2020)

• Record Type: Journal Article
• Authors: Corradini, Patricia Gon; de Brito, Juliana Ferreira; Boldrin Zanoni, Maria Valnice; Mascaro, Lucia Helena
• Is Part Of: Journal of CO₂ utilization. Issue 36(2020)
• Page Start: 187
• Page End: 195
• Publication Date: 2020-02
• Subjects: Reduction of CO2 -- Photocatalysis -- Semiconductors -- Fuel production -- BiVO4 lamellar; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.10.020
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: BiVO4 lamellar was synthesized by microwave system using experimental design. All the prepared samples led to the methanol production by CO2 photoreduction. For the first time, acetone formation was observed for BiVO4 . Presence of Bi2 O3 or other crystallographic species affected the material activity. Abstract: The high levels of atmospheric CO2 transformed this compound in a preoccupant pollutant. However, a wide range of semiconductors, including bismuth vanadate (BiVO4 ), can be applied for CO2 reduction aiming generation of fuels. This work reports the optimization of the BiVO4 layer synthesis by microwave system using factorial experimental design, where the variables time (5 to 15 min) and temperature (120 to 160 °C) were studied. For evaluation purposes, the materials synthetized were applied in photocatalytic reduction of CO2 . All the BiVO4 materials analyzed promoted the formation of methanol. The best condition was obtained under the material synthesized at 160 °C with 15 min of reaction, where 1.5 mmol L −1 gcat −1 of methanol was produced after 120 min of photocatalysis. For the first time, acetone formation was observed in this kind of material. The best condition for acetone production was acquire with the material prepared at 140 °C with 10 min of synthesis, where 0.030 mmol L −1 gcat −1 was generated after 240 min of CO2 reduction. Differences in methanol concentration obtained among the samples were probably related to crystallographic patterns of the material, once the presence of Bi2 O3 or other BiVO4 crystallographic species may affect the efficiency of the material. The results obtained in this work show that the use of BiVO4 layer semiconductor prepared by microwave system for CO2 reduction leads to the generation of high amounts of methanol under just UV–vis light incidence, aside from promoting the production of acetone.