Síntesis en verde con Aloe Vera de MgAl2O4 sustituido por Mn y sin tratamiento de calcinación
DOI:
https://doi.org/10.33448/rsd-v11i6.28873Palabras clave:
MgAl2O4; Aloe Vera; Combustión de microondas; Mn.Resumen
Los aluminatos de magnesio (MgAl2O4) con Mn reemplazando los sitios A y B fueron sintetizados por el método de combustión asistida por microondas aplicando alta potencia (900 W) utilizando Aloe Vera como agente quelante verde. El estudio evaluó el efecto de la presencia de Aloe Vera y el posterior tratamiento térmico sobre las características estructurales de los polvos de espinela por difracción de rayos X (XRD). El efecto del tratamiento térmico se evaluó de dos formas: con y sin calcinación. Los resultados mostraron que las sustituciones ocurrieron formando las siguientes fases Mg0,21Mn2,36Al0,43O4, Mg0,13Mn2,63Al0,25O4, Mg0,31Mn2,06Al0,63O4, reemplazando el sitio A. Y MgMn1,88Al0,13O4 y MgMn1,75Al0,25O4, reemplazando el sitio B. La presencia de iones Mn y Aloe Vera afectó la estructura cristalina de la espinela. El grado de cristalinidad es menos intenso cuando el aluminato de magnesio fue reemplazado por el ion Mn, debido a la cantidad de deformaciones en el sistema cristalino inducidas por el ion sustituyente. Sin embargo, la calcinación de los polvos aumentó el grado de cristalinidad en todos los escenarios. Además, la sustitución provocó alteración en los parámetros de la red debido a la diferencia entre el radio iónico del sustituyente y el ion de Mg2 o Al3, evidenciándose en las posiciones de 2θ. La fase cúbica de la espinela se encontró en la mayoría de los materiales, aunque la fase tetraédrica se observó en algunas estructuras sustituidas con Mn. Los tamaños de cristalitos de los polvos fueron influenciados por la presencia de fitoquímicos presentes en el Aloe Vera. Se observó una disminución en el tamaño de los cristalitos cuando los materiales fueron calcinados como resultado de la gasificación de las biomoléculas del extracto vegetal. Sin embargo, estas biomoléculas ayudan en la disociación de precursores, aunque lentamente, lo que impidió el crecimiento de cristalitos. El uso de Aloe Vera como agente quelante demostró ser eficiente en la síntesis de espinelas de aluminato de magnesio, señalando el material sintetizado como una ruta prometedora para el campo de la síntesis verde.
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Derechos de autor 2022 Pedro Paulo Linhares Ferreira; Dulce Maria de Araújo Melo; Rodolfo Luiz Bezerra de Araújo Medeiros; Tomaz Rodrigues de Araújo; Fernando Velcic Maziviero; Ângelo Anderson Silva de Oliveira
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