Research Paper
Year: 2022 | Month: October | Volume: 9 | Issue: 10 | Pages: 34-42
DOI: https://doi.org/10.52403/ijrr.20221006
Adsorption of Methylene Blue on MnO2-Modified Activated Carbon Prepared from Cocoa Pod Shells
Akissi Lydie Chantal Koffi1, Djamatché Paul Valéry Akesse1, Amadou Kouyate1, Bini Kouamé Dongui1, Kouassi Binjamin Yao2
1Laboratory for Environmental Science and Technology, Jean Lorougnon Guede University, Daloa, Côte d’Ivoire, BP 150 Daloa, Côte d'Ivoire
2Laboratory of Industrial Processes, Synthesis, Environment and New Energies (LAPISEN) ; Institut National Polytechnique Houphouët-Boigny, BP 1313 Yamoussoukro, Côte d’Ivoire
Corresponding Author: Akissi Lydie Chantal Koffi
ABSTRACT
This study focused on the preparation of activated carbon modified with manganese oxides, in order to apply it to the removal of methylene blue in aqueous solution. Activated carbon (AC) was elaborated from cocoa pod shells, which is a local biomass available in Côte d'Ivoire. This activated carbon was then modified with manganese oxides to give AC-MnO2 in order to increase its performance in the removal of methylene blue in aqueous solution. The characterization of these activated carbons revealed their microporous structure with a specific surface of 890.64 m2/g for AC and 732.3 m2/g for AC-MnO2. Kinetic study showed that the methylene blue elimination reaction is pseudo-second order with an equilibrium time of 60 min. Langmuir's model of a monolayer adsorption better reproduces the experimental adsorption isotherms with a maximum adsorption capacity of 222.22 mg/g with CA and 270.27 mg/g with AC-MnO2.
Keywords: Adsorption, Activated carbon, cocoa pod shell, Methylene blue, manganese oxides
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