Adsorption Of Methylene Blue Using Unactivated Corn Cobs Powder From Adamawa Region Of Cameroon

The agricultural waste corn ears have been used in the depollution of sewage loaded with coloring, including Methylene Blue (MB). The adsorption balance was reached in 15min. The yield of elimination of Methylene Blue reached 96.85%. The experimental data are analyzed by two isotherms (Freundlich and Temkin). The Freundlich nf constant is between 0 and 0.5. We have studied thermodynamic parameters in the temperature range of 298K and 338K. We got free energy negative (ΔG˂0), the standard enthalpy of the removal positive and below 50 KJ/mol, demonstrating that the reaction is favorable, spontaneous, endothermic, and of physical nature. The kinetic model of pseudo second order and Elovich were applied is the correlation coefficients R2 is 0.99. The reactions are made according to the models of pseudo second order and Elovich suggesting the hypothesis that the mechanism of the reactions are done in two phases: - The diffusion of the BM towards the surface of the adsorbent; - The interaction between the adsorbate molecules (MB) and the surface of the adsorbent, suggesting the existence of chemisorption.