[01] Richard Domga, Department of Applied Chemistry, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon；Department of Chemistry, Faculty of Science University of Ngaoundere, Ngaoundere, Cameroon. [02] Massai Harouna, Department of Chemistry, Faculty of Science, University of Maroua, Maroua, Cameroon. [03] Constant Tcheka, Department of Inorganic Chemistry, Faculty of Science, University of Yaounde, Yaounde, Cameroon. [04] Jean Bosco Tchatchueng, Department of Applied Chemistry, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon. [05] Arbam Tsafam, Department of Chemistry, Faculty of Science University of Ngaoundere, Ngaoundere, Cameroon. [06] Domga , Department of Applied Chemistry, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon. [07] Nathalie Kobbe Dama, Department of Applied Chemistry, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon. [08] Dangwang Dikdim, Department of Applied Chemistry, ENSAI, University of Ngaoundere, Ngaoundere, Cameroon；Department of Chemistry, Faculty of Science University of Ngaoundere, Ngaoundere, Cameroon.

This paper report the efficiency of carbonaceous adsorbent prepared from Bos Gudali Inducus bones in removing of methylene blue (MB) in aqueous solution. The experimental parameters such as pH of solution, contact time, adsorbent dose, initial concentration of MB and temperature were studied. The adsorbent showed good potential for adsorption at pH 3.0 with a maximum take up of 98.58%. Adsorption equilibrium was reached after 10min. FT-IR spectra indicated high surface functional groups present in the carbons. Experimental data were analysed by two adsorption isotherms models (Langmuir and Freundlich). Applicability of isotherm equation to describe the adsorption process was analysed by the correlation coefficients values, R². Langmuir model shows best fit with R2 values of 0.999, as compared to the Freundlich model. Kinetic model of pseudo-second-order best describes the adsorption kinetics on the experimental data. 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 ΔH°, ΔG° and ΔS° 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. The results of this study show that the animal activated carbon from bones of zebu cattle Gudali can be used as an adsorbent for removal of methylene blue residue in aqueous solution.

Activated Carbon, Adsorption Isotherms, Kinetics, Methylene Blue, Thermodynamic

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