1. Comparison of methylene blue sequestration potentials of unmodified and Fenton’s modified plantain (Musa paradisiaca) peels biomass
- Author
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Oninla, Vincent O., Awokoya, Kehinde N., Babalola, Jonathan O., Abimbola, Asisat A., and Adesokan, Taiwo B.
- Abstract
The utilization of unmodified and Fenton’s modifies plantain peels biomass in the removal of methylene blue from aqueous solution is here reported. Optimum modification for methylene blue sequestration was established by varying Fe2+/H2O2ratio at different pH. Adsorbent’s characterization was performed by Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The effects of contact time, initial dye concentration, dosage and temperature on the sorption process were investigated in a batch adsorption process. Optimum modification was achieved at ratio 1:200 Fe2+/H2O2and pH 5. Characterization suggested the binding sites to be mainly the –OH and C=O groups. Morphology probe revealed improved surface roughness and porosity after modification. Sorption of methylene blue onto the modified sample was higher and faster (reaching about 97% removal at equilibrium time of 30 min) than onto the unmodified sample in which 84% removal was observed after 3 h. With concentration increase from 0.031 to 1.563 mmol/L at 30 ℃, uptake by the modified variant was enhanced from 0.0244 to 0.5907 mmol/L. Dye uptake decreased with increasing temperature. The kinetics of the process was best described by the pseudo-second-order model, suggesting chemisorption and intraparticle diffusion as the probable rate-determining steps. Isotherm modeling showed good correlation with the Freundlich model, indicating heterogeneous and multilayered adsorption. Free energy values of about 7.0 kJ/mol and ΔHvalues of − 185.6 and − 542.422 kJ/mol for the unmodified and modified samples, respectively, suggested the involvement of both physical and chemical adsorption. In all, the modified variant presented itself as a better adsorbent.
- Published
- 2022
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