Dentre os processos para remover contaminantes da água, a adsorção se distingue como uma tecnologia de remediação superior. O grafeno vem se destacando como material adsorvente devido às suas propriedades únicas. Este estudo foi realizado utilizando um nanocompósito magnético híbrido de grafeno e ferrita de manganês (NCGM) para o tratamento de água contaminada com herbicida diuron, desenvolvendo possíveis processos alternativos de tratamento de água e efluentes. O potencial de adsorção do adsorvente foi avaliado em ensaios batelada. Foram realizados estudos cinéticos, sendo as isotermas de adsorção também estudadas. Os resultados mostraram que o grafeno apresentou uma capacidade máxima de adsorção 7,9 mg g-1 para a temperatura de 45 ºC após 4 h de tempo de contato. Os resultados da cinética de adsorção ajustaram-se ao modelo de pseudo-segunda ordem, indicando um processo químico envolvido. O modelo de Freundlich foi melhor para os ajustes dos dados obtidos para as isotermas de adsorção, indicando um processo de adsorção heterogêneo e multicamadas. O processo se mostrou endotérmico, sendo favorecido pelo aumento de temperatura. Portanto, concluiu-se que o NCGM apresentou-se como um potencial material adsorvente para tratamento de águas contaminadas com diuron.
One of the current challenges is to meet the demands for quality water since the contamination of bodies of water has been intensified in the last years with the increase in the use of pesticides. Therefore, finding a way to remove contamination by pesticides from water becomes a relevant work. In this study, it was presented the design and construction of a pilot-scale batch reactor prototype in order to remove the herbicide glyphosate from artificially contaminated water using a graphene hybrid composite with manganese ferrite, MnFe2O4-G, as an adsorbent. For the reactor design, it was initially required to know the steps necessary for the removal of the glyphosate from water, according to the chosen hybrid compound for the removal. After the steps were determinated, the components were selected to compose the treatment system. The layout of the prototype was defined and the positions of the elements and materials were chosen. Finally, the prototype was built and tested in the laboratory. The results showed that within 15 minutes the separation was completed and 70% of the adsorbent was recovered in the magnetic separator after 4 complete cycles of treatment. It was concluded that the prototype built fulfills the objective for which it was proposed, presenting the advantage of having all the steps of adsorption and desorption for glyphosate decontamination in the same equipment, being able to be expanded for use in effluent treatment plants.
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