Please use this identifier to cite or link to this item: http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2405
SYNTHESIS, CHARACTERIZATION AND PHOTOCATALYTIC EVALUATION OF NiWO4 FOR THE PRODUCTION OF H2 BY WATER SPLITTING
MIGUEL JESUS MELENDEZ ZARAGOZA
Jesús Manuel Salinas Gutiérrez
Alejandro López Ortíz
VIRGINIA HIDALINA COLLINS MARTINEZ
Acceso Abierto
Atribución-SinDerivadas
This work describes the synthesis through precipitation, characterization and photocatalytic evaluation of nickel tungstate (NiWO4) under visible light irradiation for the production of H2 by the water splitting reaction. This photocatalyst was obtained at room temperature by a dissolutionprecipitation reaction between the corresponding Ni+2 and (WO4)-2 ions. The precipitation reaction was carried out with the addition of oleic acid (AO, 0.1 and 1%V) using two stirring methods: magnetic (AM) and shear stress (TU) stirring, each performed separately. Characterization was carried out by TGA, XRD, BET, SEM and UV-Vis spectroscopy. Photocatalytic evaluation under visible light irradiation was followed by GC analysis. The thermal behavior of the samples (TGA) revealed the physical and chemical absorption of the OA on the surface of NiWO4, reflected in the increase of the weight loss as a consequence of the increase in AO content. XRD patterns confirmed the crystalline phase of the wolframite structure, with a crystallite size around 22 nm for AM and 22-25 nm for UT for 0.1 and 1% AO. The BET surface area of the samples were 22.43, 24.25 m2/g and 27 and 18 m2/g for AM and UT in both percentages of AO, respectively. UV-Vis diffuse reflectance characterization of the samples revealed that these materials present an indirect transition of Eg ~ 2 eV, which is favorable for their photoactivation under visible irradiation of the electromagnetic spectrum. The photocatalytic evaluation for sample 1% AO under UT resulted in a production of 6.5 μmol H2/g*h, resulting in a sevenfold increase compared to WO3.
2018
Memoria de congreso
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PROCESOS QUÍMICOS
Appears in Collections:Artículos de Congresos

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