TITLE:
Fixed-Bed Column Adsorption Modeling of MnO4- Ions from Acidic Aqueous Solutions on Activated Carbons Prepared with the Biomass
AUTHORS:
Charly Mve Mfoumou, Francis Ngoye, Pradel Tonda-Mikiela, Mbouiti Lionel Berthy, Bouassa Mougnala Spenseur, Guy Raymond Feuya Tchouya
KEYWORDS:
Acidic Media, MnO4-, Biomass, Activated Carbon, Dynamic Adsorption, Kinetics Models
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.13 No.2,
April
30,
2023
ABSTRACT: Activated carbons calcined at 400˚C and 600˚C (AC-400 and AC-600),
prepared using palm nuts, collected in the town of Franceville in Gabon, were
used to study the dynamic adsorption of MnO4- ions in
acidic media on fixed bed column and on the
kinetic modeling of experimental data of breakthrough curves of MnO4- ions
obtained. Results on the adsorption ofMnO4- ions in fixed-bed dynamics obtained on AC-400 and AC-600 adsorbents beds indicated that the AC-400
bed appears to be the most efficient in removingMnO4- ions in
acidic media. Indeed, the adsorbed amounts, the adsorbed capacities at
saturation and the elimination percentage ofMnO4- ions
obtained with AC-400 (31.24 mg; 52.06 mg·g-1 and 41.65%
respectively) were higher compared to those obtained with AC-600 (9.87 mg;
16.45 mg·g-1 and 17.79% respectively). The breakthrough curves kinetic modeling revealed
that the Thomas model and the pseudo-first-order kinetic model were the most
suitable models to describe the adsorption ofMnO4- ions on
adsorbents studied in our experimental conditions. The results of the
intraparticle diffusion model showed that intraparticle diffusion was involved
in the adsorption mechanism ofMnO4- ions on
investigated adsorbents and was not the limiting step and the only process
controllingMnO4-ions
adsorption. In contrast to AC-400, the intraparticle diffusion on AC-600 bed
plays an important role in the adsorption mechanism ofMnO4- ions.