Effect of the concentration of iron in the properties of Nb2O5 with posible photocatalitic application

Efecto de la concentración de hierro en las propiedades del NB2O5 con posible aplicación fotocatalítica

dc.creatorMurillo Ruíz, Edwin Alberto
dc.creatorRaba Páez, Angela Mercedes
dc.creatorRincón Joya, Miryam
dc.date2017-11-29
dc.date.accessioned2022-12-15T16:04:20Z
dc.date.available2022-12-15T16:04:20Z
dc.identifierhttps://revistas.unimilitar.edu.co/index.php/rcin/article/view/2669
dc.identifier10.18359/rcin.2669
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/5355685
dc.descriptionAt present, it is searching to develop low gap band energy compounds to be applied in photocatalysis. Niobium pentoxide was doped with iron in order to establish the relationship between its structural, morphological and surface properties, and possible photocatalytic applications. Nb2O5 doped with Fe (at 2.5%, 5% and 10%, percentage by weight) powders were prepared through the Pechini method, this seeking to establish the appropriate synthesis conditions for the formation of Nb2O5: Fe particles. The powders were sintered at 600°C and 700°C for 2 hours in air and afterwards were examined by TGA, XRD, SEM, UV-vis diffuse reflectance spectroscopy and by the BET method. The thermal analysis allowed establishing the behavior of the percentage of weight loss as a function of temperature in the precalcined samples. Results obtained for non-doped oxide were compared with those of Nb2O5 doped with Fe to analyze its crystalline properties. The Nb2O5 doped with Fe at 2.5% and 5% diffractograms, subjected to 700°C, were similar to that of the non-doped oxide indicating that Nb was replaced by Fe and, therefore, there are not significant variations in the oxide structure. The crystallite size of the Nb2O5 doped with Fe nanostructured particles it was increased in all cases, when the sintering temperature was increased from 600°C to 700°C. The gap band energy of Nb2O5:Fe decreased with the temperature increase for the concentrations of 2.5% and 5%. The SBET value increased with the iron concentration increase. The sample Nb2O5:Fe5%, calcined at 700°C, showed an Eg of approximately 2.69 eV and structural and superficial characteristics that make it promising for tests of photocatalytic performance.en-US
dc.descriptionActualmente, se busca desarrollar compuestos de energía de banda gap baja para ser aplicados en fotocatálisis. Se eligió dopar el pentóxido de niobio con hierro con el fin de establecer la relación entre sus propiedades estructurales, superficiales y ópticas, y posibles aplicaciones fotocatalíticas. Se prepararon polvos de Nb2O5 dopados con Fe (al 2,5%, 5% y 10%, porcentaje en peso) por el método Pechini, buscando establecer las condiciones de síntesis apropiadas para la conformación de partículas de Nb2O5:Fe. Los polvos fueron sinterizados a 600°C y 700°C por 2 h en aire y posteriormente fueron examinados por TGA, DRX, MEB, espectroscopía de reflectancia difusa UV-vis y por el método BET. En las muestras precalcinadas el análisis térmico permitió establecer el comportamiento del porcentaje de pérdida de peso en función de la temperatura. Se compararon los resultados obtenidos para el óxido no dopado con los del Nb2O5 dopado con Fe para analizar sus propiedades cristalinas. Los difractogramas del Nb2O5 dopado con Fe al 2,5% y 5%, sometido a 700°C, fueron similares al del Nb2O5 no dopado indicando que el Nb fue sustituido por el Fe y, por lo tanto, no se presentan variaciones considerables en la estructura del óxido. El tamaño de cristalito de las partículas nanoestructuradas de Nb2O5 dopado con Fe se incrementó en todos los casos, cuando la temperatura de sinterización se incrementó de 600°C a 700°C. La energía de banda gap del Nb2O5:Fe disminuyó con el incremento de la temperatura para las concentraciones de 2,5% y 5%. El valor del SBET aumentó con el incremento de la concentración de hierro. La muestra Nb2O5:Fe5%, calcinada a 700°C, presentó una Eg de aproximadamente 2,69 eV y características estructurales y superficiales que la hacen promisoria para pruebas de desempeño fotocatalítico.es-ES
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dc.languagespa
dc.publisherUniversidad Militar Nueva Granadaes-ES
dc.relationhttps://revistas.unimilitar.edu.co/index.php/rcin/article/view/2669/2681
dc.relationhttps://revistas.unimilitar.edu.co/index.php/rcin/article/view/2669/3052
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dc.rightsDerechos de autor 2017 Ciencia e Ingeniería Neogranadinaes-ES
dc.rightshttps://creativecommons.org/licenses/by-nc-nd/4.0es-ES
dc.sourceCiencia e Ingenieria Neogranadina; Vol. 28 No. 2 (2018); 29-42en-US
dc.sourceCiencia e Ingeniería Neogranadina; Vol. 28 Núm. 2 (2018); 29-42es-ES
dc.sourceCiencia e Ingeniería Neogranadina; v. 28 n. 2 (2018); 29-42pt-BR
dc.source1909-7735
dc.source0124-8170
dc.subjectNb2O5en-US
dc.subjectFeen-US
dc.subjectPechini methoden-US
dc.subjectthermal treatmenten-US
dc.subjectstructural properties photocatalysisen-US
dc.subjectNb2O5es-ES
dc.subjectFees-ES
dc.subjectmétodo Pechinies-ES
dc.subjecttratamiento térmicoes-ES
dc.subjectpropiedades estructuraleses-ES
dc.subjectfotocatálisises-ES
dc.titleEffect of the concentration of iron in the properties of Nb2O5 with posible photocatalitic applicationen-US
dc.titleEfecto de la concentración de hierro en las propiedades del NB2O5 con posible aplicación fotocatalíticaes-ES
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion


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