Kinetic Studies On Reactive Dye Removal From Aqueous Solution By Using Arecanut Peel

Abstract

This research aims at finding the effectiveness of Remazole Red RGB dye removal using arecanut peel, an agricultural waste, as an activated carbon. The arecanut peel-activated carbon was prepared in the laboratory by carbonization followed by activation. Adsorption studies were carried out to look for the effect of different experimental scenarios, like different pH values, varying contact times, the initial concentration of dye, and changing arecanut peel carbon dosage, on the removal efficiency of Remazole Red RGB dye from the experimental solution. The equilibrium experimental results were checked for the applicability of the Langmuir and Freundlich isotherm models and the kinetic models. The batch test result was a maximum dye removal of 83% with an initial dye concentration of 5 mg/L at an adsorbent dose of 0.625 g/L at dye pH 4 in a 50-minute time span. For Remazole Red RGB dye removal, the test result is unfavorable for the Langmuir isotherm model but suits well for he Freundlich i isotherm model. The maximum adsorption capacity of arecanut peel carbon on Remazole Red RGB dye was 3.89 mg/g. It was evident that the adsorption process is favorable for the pseudo-second-order rate kinetics. It was seen that intra-particle diffusion is not the only rate-limiting step in this adsorption experimental system; also, regression results show that the linear regression model gives the best outcome. The end result of this study confirms that powder arecanut peel activated carbon was the right option for removing reactive dye from an aqueous solution.