Synthesis of hierarchical flower-like Bi₂MoO₆microspheres as efficient photocatalyst for photoreduction of CO₂into solar fuels under visible light

Abstract

Hierarchical flower-like Bi 2 MoO 6 microspheres were successfully synthesized via a facile hydrothermal approach, employing PVP as the crystal growth modifier. The building units of the hierarchical flower-like Bi 2 MoO 6 were constructed by two-dimensional thin flakes, which intercrossed with each other and aggregated together to form the three-dimensional flower-like structure. The PVP amount and hydrothermal duration played crucial roles in the formation of the Bi 2 MoO 6 architectures with evolving morphologies.The Bi 2 MoO 6 samples were first evaluated for the photocatalytic reduction of CO 2 into methanol and ethanol as solar fuels under visible-light irradiation. It has been found that the hierarchical flower-like Bi 2 MoO 6 exhibits highly efficient photocatalytic activity. After 4 hours of irradiation, the yields of methanol and ethanol were 24.8 and 18.8 μmol g cat −1 respectively, higher than those obtained over previously-reported Bi 2 WO 6 hollow microspheres. This demonstrates that the hierarchical flower-like Bi 2 MoO 6 is a simple, efficient and promising visible-light-driven photocatalyst for the photoreduction of CO 2 into solar fuels.

Bismuth‐Based Photocatalysts for Solar Photocatalytic Carbon Dioxide Conversion

“…[179][180][181] It is widely applied in the degradation of organic pollutants [179] and photocatalytic oxygen evolution. [182] Methanol and ethanoly ields were 6.2 and 4.7 mmol h À1 g À1 ,r espectively, which were highert han those reported for hollow Bi 2 WO 6 microspheres. Dai and co-workers found that hierarchical flowerlike Bi 2 MoO 6 exhibited efficient photocatalytic activity for CO 2 conversion.…”

“…Dai and co-workers found that hierarchical flowerlike Bi 2 MoO 6 exhibited efficient photocatalytic activity for CO 2 conversion. [182] Methanol and ethanoly ields were 6.2 and 4.7 mmol h À1 g À1 ,r espectively, which were highert han those reported for hollow Bi 2 WO 6 microspheres. In 2017, Zhou et al also provedt he photocatalytic activity of Bi 2 MoO 6 for the conversion of CO 2 into CH 4 .…”

Bi2MoO6 Nanostrip Networks for Enhanced Visible‐Light Photocatalytic Reduction of CO2 to CH4

“…[3] The g-Bi 2 MoO 6 ,k nown as "koechlinite", [4] is ak ind of visible-light-responsive photocatalyst, widely being applied in the degradation of organic pollutants, [6][7][8][9][10][11][12][13][14][15][16][17][18][19] photocatalytic oxygen evolution, [20][21][22][23] and the photocatalytic reduction of CO 2 . [24] Many g-Bi 2 MoO 6 morphologies were reported,i ncludingn anosheets, nanoplates, flakes or nanobelts, [6][7][8][9][10][11][12][13]20] hollow boxes, [14] nanotubes, [15] hollow spheres, [16,17] nanoparticles, [18] and flowerlike hierarchical microspheres. [19,24] Hierarchicala rchitectures, building of nanorods, nanoplates, nanotubes etc.,h ave received wide attention in photocatalysis.…”

“…[24] Many g-Bi 2 MoO 6 morphologies were reported,i ncludingn anosheets, nanoplates, flakes or nanobelts, [6][7][8][9][10][11][12][13]20] hollow boxes, [14] nanotubes, [15] hollow spheres, [16,17] nanoparticles, [18] and flowerlike hierarchical microspheres. [19,24] Hierarchicala rchitectures, building of nanorods, nanoplates, nanotubes etc.,h ave received wide attention in photocatalysis. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Properly designed hierarchical structures (including porosity and morphology)c an not only enhance light harvesting and improve molecular diffusion/transportk inetics, but also increase the surface area and the amount of active sites, which accelerate the surface reaction kinetics.…”

“…[19,24] Hierarchicala rchitectures, building of nanorods, nanoplates, nanotubes etc.,h ave received wide attention in photocatalysis. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Properly designed hierarchical structures (including porosity and morphology)c an not only enhance light harvesting and improve molecular diffusion/transportk inetics, but also increase the surface area and the amount of active sites, which accelerate the surface reaction kinetics. [2] In this work, g-Bi 2 MoO 6 nanostrip networks were synthesized through ah ydrothermalr oute using sodium oleate as as urfactant.…”