Clean Water and Sanitation (SDG 6), Climate Action (SDG 13)
Mn 2 O 3 Nanoparticle Impregnated Vigna subterranean and Glycine max husks for the Optimization of Oil Remediation in Contaminated Water Cynthia Ibeto 1,* , Ikeokwu Ogbu 1,2 , Assumpta Nwanya 3 and Chukwuma Okoye 1 1 Department of Pure and Industrial Chemistry, University of Nigeria Nsukka, Nigeria 2 Materials and Energy Technology Department, Projects Development Institute, Federal Ministry of Science Technology, Nigeria 3 Department of Physics and Astronomy, University of Nigeria Nsukka, Nigeria The sorption of crude oil using raw (unmodified) Vigna subterranean and Glycine max husks and their nanoparticle modified forms were investigated for the treatment of oil spilled water surfaces by batch sorption technique. Box-Behnken design was employed for optimization of the sorption process by response surface methodology using the design expert software. The sorbents’ characterization was carried out by Fourier transform infrared, scanning electron microscope, Brunauer-Emmett-Teller surface area analysis, and Thermogravimetric analysis. Equilibrium isotherm data were evaluated using Langmuir, Freundlich, Temkin, and Scatchard models. The Langmuir gave the best fit to the experimental data based on their Chi-square (χ2), the sum of squares of the errors and regression (R2) values, and maximum monolayer uptake capacity of 3.79 and 5.71 g g -1 were obtained for the raw and nanoparticle modified Vigna subterranean husks (RVSH and NVSH) respectively while 3.47 and 5.29 g g -1 were obtained for raw and nanoparticle-modified Glycine max husks (RGMH and NGMH) respectively. Kinetics was discussed using pseudo-first-order, pseudo-second-order, liquid film diffusion, and intraparticle diffusion models, and showed that their sorption will be satisfactorily described using pseudo-second- order, based on their large R2 values when compared with other models and at equilibrium uptake time of 70 and 50 min for oil on the raw and nanoparticle modified husks respectively. Thermodynamic parameters revealed a process that is non-spontaneous for the raw husks but spontaneous and feasible for nanoparticle-modified husks. It was also an endothermic and physicochemical sorption process. Regeneration and reusability after three sets of sorption-desorption were better with nanoparticle modified husks using n-hexane as an effective solvent. Thus, this research has shown greater potentials of nanoparticle-modified husks particularly NVSH as a more sustainable sorbent for management of oil spilled water surfaces. Keywords: Vigna subterranean husks; Glycine max husks; Nanoparticle; Isotherms; Kinetics; Sorption.
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