TITLE:
Activated Carbon Based on Acacia Wood (Auriculeaformis, Côte d’Ivoire) and Application to the Environment through the Elimination of Pb2+ Ions in Industrial Effluents
AUTHORS:
Drissa Ouattara Kra, Grah Patrick Atheba, N’da Arsène Kouadio, Patrick Drogui, Albert Trokourey
KEYWORDS:
Acacia auriculeaformis, Activated Carbon, Lead(II) Ion, Adsorption Isotherms, Kinetics
JOURNAL NAME:
Journal of Encapsulation and Adsorption Sciences,
Vol.11 No.1,
March
31,
2021
ABSTRACT: The objective of this study is to develop carbon, that of Acacia
auriculeaformis through its activation in order to eliminate lead in an aqueous medium. A
series of activated carbon has been prepared by chemical activation with
phosphoric acid, sodium hydroxide and sodium chloride. The determination of the physico-chemical properties of the
prepared carbon guided the choice of phosphoric acid activated carbon as the
best adsorbent for the elimination of lead(II) in an aqueous solution. Pb2+ adsorption tests in batch mode have
shown that the adsorption capacity is influenced by various parameters such as
mass, pH, concentration of Pb2+ ions and contact time
linked to the medium and the adsorbent. Adsorption isotherms, kinetic models
and thermodynamics have been used to describe the adsorption process. The
equilibrium data for activated charcoal correspond well to the model of
Freundlich, Langmuir, Temkin and Kiselev.
The kinetic adsorption data proved to be better described by the
pseudo-second order model with external and
intraparticle diffusion which are two decisive steps in the adsorption
process of Pb2+ ions. Thermodynamics and adsorption
isotherms predict a spontaneous exothermic surface reaction, of the
chemisorption type, with ion retention in
orderly monolayers on the heterogeneous surface of the adsorbent. Tests carried
out with this adsorbent material have contributed to the elimination of the Pb2+ ions contained in an industrial effluent with a reduction rate reaching
42.52% against 85.90% in a synthetic solution.