Author(s)

Liouna Adoum Amola¹, Theophile Kamgaing¹, Donald Raoul Tchuifon Tchuifon^1,2, Cyrille Donlifack Atemkeng¹, Solomon Gabche Anagho^1*

¹Laboratory of Noxious Chemistry and Environmental Engineering, Department of Chemistry, University of Dschang, Dschang, Cameroon.
²Department of Chemical Engineering and Process Engineering, National Higher Polytechnic School of Douala, University of Douala, Douala, Cameroon.

In this study, shea residues (Vitellaria paradoxa) dumped in the wild by the units processing almonds into butter were used in the production of activated carbons. Shea nut shells harvested in the locality of Baktchoro, West Tandjile Division of Chad were used as a precursor for the preparation of activated carbons by chemical activation with phosphoric acid (H₃PO₄) and sulphuric acid (H₂SO₄). Central Composite Design (CCD) was used to optimize the preparation conditions, and the factors used were concentration of activating agent (1 - 5 M), carbonization temperature (400°C - 700°C) and residence time (30 - 120 min). The studies showed that at optimal conditions the yield was 51.45% and 42.35%, while the iodine number (IN) was 709.45 and 817.36 mg/g for CAK-P (phosphoric acid activated carbon) and CAK-S (sulphuric acid activated carbon) respectively. These two activated carbons (ACs) which were distinguished by their considerable iodine number, were variously characterized by elementary analysis, pH at the point of zero charge (pHpzc), bulk density, moisture content, Boehm titration, Fourier transform infrared spectroscopy, BET adsorption and scanning electron microscopy. These analyses revealed the acidic and microporous nature of CAK-P and CAK-S carbons, which have a specific microporous surface area of 522.55 and 570.65 m²·g⁻¹ respectively.

Residue, Shea Nuts, Activated Carbon, Optimization, Central Composite Design

Amola, L. , Kamgaing, T. , Tchuifon, D. , Atemkeng, C. and Anagho, S. (2020) Activated Carbons Based on Shea Nut Shells (Vitellaria paradoxa): Optimization of Preparation by Chemical Means Using Response Surface Methodology and Physicochemical Characterization. Journal of Materials Science and Chemical Engineering, 8, 53-72. doi: 10.4236/msce.2020.88006.