Cerium molybdate semiconductive nanoparticles were synthesized by the EDTA-citrate combined complexation method. Gel thermal degradation behavior, phase formation, morphology, composition and band gap of cerium molybdate powders were characterized by TG/DSC, XRD, SEM/EDS and DRS analysis, respectively. The nanoparticles were synthesized by fixing the pH of the reaction medium to 9, producing an organometallic gel which was heated to 230 ºC obtaining a precursor powder. The precursors were calcined in a temperature range of 450 -800 ºC for 3 h. The cerium molybdate powders were characterized and the phase evolution, morphology and band gap changes with the increase of calcining temperature were investigated. It was observed that the calcining temperature directly influences the formation of the crystalline structure, appearance of other phases in the materials and the particle size.
International audienceNano-octahedral grains of cobalt ferrite (CoFe2O4) with size around 20 nm were synthesized by a hydrothermal route. X-rays and electron diffraction, along with scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy and thermogravimetric analysis were used to characterize the powders. Images and simulations of high-resolution electron microscopy allowed the identification of the shape of the grains. Process parameters such as temperature and time of reaction, reagents concentration, and pH of the reacting medium were optimized. The surfactant cetyltrimethylammonium bromide (CTAB) hindered the formation of goethite, which favored the production of a pure CoFe2O4 powder. The oxidation state of cobalt atoms on the ferrite structure was also influenced by CTAB. The control of the shape of the grains was associated mainly to the nature of the precipitating agent
CO2 photocatalytic conversion into value-added
fuels
through solar energy is a promising way of storing renewable energy
while simultaneously reducing the concentration of CO2 in
the atmosphere. Lead-based halide perovskites have recently shown
great potential in various applications such as solar cells, optoelectronics,
and photocatalysis. Even though they show high performance, the high
toxicity of Pb2+ along with poor stability under ambient
conditions restrains the application of these materials in photocatalysis.
In this respect, we developed an in situ assembly strategy to fabricate
the lead-free double perovskite Cs2AgBiBr6 on
a 2D bismuthene nanosheet prepared by a ligand-assisted reprecipitation
method for a liquid-phase CO2 photocatalytic reduction
reaction. The composite improved the production and selectivity of
the eight-electron CH4 pathway compared with the two-electron
CO pathway, storing more of the light energy harvested by the photocatalyst.
The Cs2AgBiBr6/bismuthene composite shows a
photocatalytic activity of 1.49(±0.16) μmol g–1 h–1 CH4, 0.67(±0.14) μmol
g–1 h–1 CO, and 0.75(±0.20)
μmol g–1 h–1 H2, with a CH4 selectivity of 81(±1)% on an electron
basis with 1 sun. The improved performance is attributed to the enhanced
charge separation and suppressed electron–hole recombination
due to good interfacial contact between the perovskite and bismuthene
promoted by the synthesis method.
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