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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2555| 1.29 Synthesis of spinel-type ferrites by the Oil-in-Water microemulsion reaction method and its evaluation for photocatalytic water-splitting | |
| ARTURO ADRIAN RODRIGUEZ RODRIGUEZ MIGUEL ANGEL PEREZ ANGON Alejandro López Ortíz | |
| Acceso Abierto | |
| Atribución-NoComercial | |
| ABSTRACT Spinel-type ferrites have the molecular formula MFe2O4, where M represents a divalent metallic cation, such as Co2+, Ni2+ and Zn2+ for CoFe2O4, NiFe2O4 and ZnFe2O4, respectively.As photocatalyst, spinel-type ferrites have shown an efficient visible light absorption, high sorption ability, thermal stability, and low toxicity. Moreover the magnetic response of MFe2O4 allows their easy recovery from the liquid reaction media. Thanks to these features, MFe2O4 compounds are a promising option for the photocatalytic water-splitting, a clean and simple technology to obtain H2. In regard to the light driven production of hydrogen, the capacity of these oxides has not been fully explored, especially MFe2O4 nanoparticles synthesized by microemulsion. Based on this, we synthesized cobalt, niquel and zinc spinel-type ferrites employing the oil-in-water microemulsion reaction method and explored its H2 evolution. In order to perform the photocatalytic experiments, a dispersion of nanoparticles in water (with 2% of MeOH) was prepared inside a quartz tube reactor; this system was sealed, and then illuminated with a 250 W mercurial lamp. H2 production was monitored by gas chromatography. Prior to photocatalytic evaluation, as-synthesized nanomaterials were thermally treated and characterized. Obtained results evinced nanoparticles with a spinel-type crystalline structure and a semi-globular morphology. Furthermore, MFe2O4 materials exhibited an adequate surface area, visible light absorption, and a soft magnetic behavior. In the evaluation of the photoactivity, ZnFe2O4 yielded a higher amount of hydrogen (354 μmolH2g-1) compared with Co and Ni ferrites in an 8 h experiment. Broadly, this work represents a novel contribution to the studies of spinel-type ferrites for the photocatalytic production of H2. | |
| 2017 | |
| Artículo | |
| Inglés | |
| BIOLOGÍA Y QUÍMICA | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
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