Preparation of activated carbons from coffee husks by hydrothermal carbonization method and application in Methylene Blue dye removal
Keywords:
Coffee husk, Methylene blue, Adsorption isotherms, Adsorption kineticsAbstract
Activated carbon obtained from the coffee husk was successfully prepared through the method of hydrothermal carbonization (HTC) with an activating agent 1M H3PO4 at a low temperature of 130 oC. The product after the hydrothermal process was subjected to pyrolysis under N2 flow for 2 hours, at a heating temperature of 700 oC activated carbon was obtained. The adsorption of methylene blue from activated carbon is described by the Langmuir, Freundlich isotherm model, pseudo-first-order kinetic and pseudo-second-order kinetic model. Activated carbon has a high ability to adsorb methylene blue, the adsorption capacity reached 195.794 mg / g. The results of the adsorption process of activated carbon are described in accordance with the Langmuir adsorption isotherm, the correlation coefficient of the regression equation reached R2 = 0.9995. The possibility of applying a pseudo-second-order kinetic model is possible to describe the process of adsorption of methylene blue on activated carbon. This study shows that hydrothermal carbonization is a promising method for obtaining low-cost activated carbon that can become a highly effective adsorbent.
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