Silicatos mesoporosos SBA-15 modificados con Fe como catalizadores para la degradación de fármacos mediante proceso fenton heterogéneo
Date
2018
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Abstract
Se investigó la influencia de diferentes fuentes de hierro sobre las especies metálicas
desarrolladas en soportes del tipo SBA-15. Los silicatos fueron sintetizados incorporando el metal
directamente en el gel de síntesis. Los sólidos presentaron buen ordenamiento estructural y
elevadas áreas, típico de los tamices con ordenamiento hexagonal de largo alcance. Todos los
sólidos mostraron contenidos similares de Fe aunque el análisis de UV-Vis RD y TPR mostró que
el porcentaje relativo las especies metálicas desarrolladas en los materiales fueron diferentes
según el precursor de hierro usada. El catalizador sintetizado con sulfato férrico presentó una
mejor actividad en la degradación del paracetamol, adjudicada a la presencia de iones Fe3+
aislados y fuertemente anclados con los O de la estructura. Así, los iones del metal en estas
especies interactúan con el H2O2 iniciando las reacciones de formación de especies radicalarias
responsables de la degradación del fármaco.
It was studied the influence of iron precursor on the metallic species developed on SBA-15 mesoporous silicates. The molecular sieves were synthesized by direct adding of the metal precursor in the initial synthesis gel. All solids showed good structural order and high specific areas, characteristic of molecular silicates with log-range hexagonal ordering. Although a Si/Fe molar ratio of 20 allowed incorporating a similar metal content on the materials, different iron species were formed as a function of metal precursor. The catalyst synthesized with ferric sulfate showed the best activity in the paracetamol (PCT) degradation. The high performance of this solid was attributed to the presence of isolated Fe3+ ions stabilized on the structure by multiple oxygen bridge bonds. Such sites would be the active centers capable to interact efficiently with H2O2 to generate OH● species responsible for the oxidative degradation of organic molecules as PCT.
It was studied the influence of iron precursor on the metallic species developed on SBA-15 mesoporous silicates. The molecular sieves were synthesized by direct adding of the metal precursor in the initial synthesis gel. All solids showed good structural order and high specific areas, characteristic of molecular silicates with log-range hexagonal ordering. Although a Si/Fe molar ratio of 20 allowed incorporating a similar metal content on the materials, different iron species were formed as a function of metal precursor. The catalyst synthesized with ferric sulfate showed the best activity in the paracetamol (PCT) degradation. The high performance of this solid was attributed to the presence of isolated Fe3+ ions stabilized on the structure by multiple oxygen bridge bonds. Such sites would be the active centers capable to interact efficiently with H2O2 to generate OH● species responsible for the oxidative degradation of organic molecules as PCT.
Description
Keywords
Especies metálicas, SBA-15, Degradación de fármacos, Fenton heterogéneo
Citation
1° Congreso Latinoamericano y 3° Congreso de Ingeniería de Procesos y Productos
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