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ABSTRACT
This study presents the results obtained for methylene blue removal on a commercial natural activated plant-based carbon using a simple and fast method. The optimum adsorption conditions were 200 mg/L initial methylene blue concentration, pH 1 in the initial solution, 0.5 g quantity of commercial natural activated plant-based carbon, 300 min contact time, <0.5 mm particle size of commercial natural activated plant-based carbon, and 75 rpm stirring rate. Analysis of variance indicated that the most significant parameter for methylene blue removal was the quantity of commercial natural activated plant-based carbon. Also, the results showed that the quantity of commercial natural activated plant-based carbon was the most significant parameter for methylene blue removal (24% contribution), while contact time was the least significant parameter (6% contribution). Langmuir and Freundlich isotherms suggested a favorable adsorption of methylene blue by commercial natural activated plant-based carbon, while the Dubinin–Radushkevich isotherm indicated a chemisorption process involved in methylene blue removal.