Degradación de herbicidas por el proceso tipo foto-Fenton heterogéneo empleando materiales mesoporosos modificados con Ni
Date
2017
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Abstract
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La actividad agrícola de nuestra región ha intensificado en las últimas décadas la demanda de
agroquímicos destinados al control de plagas, con el fin de maximizar los rendimientos de cosecha.
Debido a esto se han convertido en los productos químicos industriales de mayor demanda en el
mercado nacional. Estos compuestos son uno de los agentes principales que han permitido alcanzar los
actuales rendimientos de la economía nacional. Sin embargo, dada su toxicidad intrínseca y
persistencia ambiental, tanto en aguas superficiales como subterráneas, terminan generando un serio
problema de contaminación y riesgo para la salud del hombre y del ecosistema. En los últimos años,
los Procesos Avanzados de Oxidación (PAO’s) han sido ampliamente utilizados para la destrucción y
la mineralización de contaminantes orgánicos no biodegradables en las aguas residuales. Diferentes
investigaciones revelan que las estructuras mesoporosas son preferibles para la degradación
agroquímicos. En este trabajo se sintetizaron silicatos mesoporosos del tipo MCM-41 modificados con
níquel mediante el método de impregnación húmeda y el método de incorporación directa seguido de
tratamiento hidrotérmico (HT). Las diferentes meso-estructuras obtenidas se caracterizaron mediante
DRX, isotermas de adsorción-desorción de N2 a 77 K, UV-Vis DRS y se estudió su comportamiento
como catalizadores heterogéneos en la reacción tipo foto-Fenton.
In the last few decades, the agricultural activity of our region has intensified the agrochemicals demand destined to the plagues control, in order to maximize the yields of harvest. Thus, these have become the most demanded industrial chemicals in the national market. These compounds are one of the main agents that allowed to the national economy, reach the current yield productivity. However, because of its toxicity and environmental persistence on surface water and groundwater, they constituted a quite serious contamination problem of ecosystems and a risk to human health. In recent years, the applications of Advanced Oxidation Processes (AOP’s) have been widely used for destruction and mineralization of non-biodegradable organic pollutants. Many studies have shown that mesoporous structures are preferred for agrochemicals degradation. In this work, MCM-41 mesoporous materials modified with nickel have been synthetized by the wet impregnation method and direct hydrothermal synthesis. The different mesostructures were characterized by XRD, N2 adsorption-desorption isotherms at 77 K, UV-Vis DRS and their behavior as heterogeneous catalyst in the photo-Fenton process was studied.
In the last few decades, the agricultural activity of our region has intensified the agrochemicals demand destined to the plagues control, in order to maximize the yields of harvest. Thus, these have become the most demanded industrial chemicals in the national market. These compounds are one of the main agents that allowed to the national economy, reach the current yield productivity. However, because of its toxicity and environmental persistence on surface water and groundwater, they constituted a quite serious contamination problem of ecosystems and a risk to human health. In recent years, the applications of Advanced Oxidation Processes (AOP’s) have been widely used for destruction and mineralization of non-biodegradable organic pollutants. Many studies have shown that mesoporous structures are preferred for agrochemicals degradation. In this work, MCM-41 mesoporous materials modified with nickel have been synthetized by the wet impregnation method and direct hydrothermal synthesis. The different mesostructures were characterized by XRD, N2 adsorption-desorption isotherms at 77 K, UV-Vis DRS and their behavior as heterogeneous catalyst in the photo-Fenton process was studied.
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Keywords
Atrazina, Níquel, MCM-41, PAO´s
Citation
XX Congreso Argentino de Catálisis (2017).
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