Removal of the methylene blue using activated charcoal derived from the pyrolisis of Gudali (Bos Indicus) bones

Description

The goal of this work was the production and the characterization of activated carbon from the Gudali species bones. From these analyses, it appears that the chemical formula of the product adsorbent is Ca10 (PO4)6 (OH)2. Langmuir model shows best fit with R2 values of 0.999, as compared to the Freundlich model. The mechanism of adsorption of methylene blue is therefore based on the assumption of the kinetic model of pseudo-second order in two steps. Thermodynamic parameters such as ∆H°, ∆G° and ∆S° proved that adsorption mechanism of MB onto activated carbon prepared from Gudali bones is possible, physisorption, spontaneous and exothermic in the ranges of temperature of 298-333K. Adsorption performances were assessed using a Box Behnken Experimental Design (BBED). Optimal adsorbed dye amount of 15.08 mg. g-1 was achieved with an initial concentration of 45 mg. L-1, a temperature of 45°C, and adsorbent mass of 0.2 g. Statistical analysis were performed using analysis of variances (ANOVA) and R2 = 98.99 lack of fit adequacy which gave good interpretation of different interactions of experimental parameters, with highly significant with confidential level