@ARTICLE{Tejada-Tovar_Candelaria_The_2021,
 author={Tejada-Tovar, Candelaria and Villabona-Ortíz, Ángel and Gonzalez-Delgado, Angel Dario},
 number={No 48},
 pages={197-204},
 journal={Journal of Water and Land Development},
 howpublished={online},
 year={2021},
 publisher={Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute},
 abstract={Agricultural residues rich in lignocellulosic biomass are low-cost and sustainable adsorbents widely used in water treatment. In the present research, thermodynamics, kinetics, and equilibrium of nickel(II) and lead(II) ion biosorption were studied using a corncob (Zea mays). The experiments were performed in a batch system evaluating the effect of tempera-ture and dose of adsorbent. Langmuir and Freundlich isotherms were used to study the equilibrium. Thermodynamic and kinetic parameters were determined using kinetic models (pseudo-first order, pseudo-second order, Elovich). Biosorbent characteristics were studied by Fourier-transform infrared spectroscopy, Scanning Electron Microscopy and Energy-dispersive X-ray spectroscopy. It was found that the hydroxyl, carboxyl, and phenolic groups are the major contributors to the removal process. Besides, Pb(II) ions form micro-complexes on the surface of the biomaterial while Ni(II) ions form bonds with active centers. It was found that the highest Ni(II) removal yields were achieved at 0.02 g of adsorbent and 70°C, while the highest Pb(II) removal yields were achieved at 0.003 g and 55°C. A maximum Ni(II) adsorption capacity of 3.52 mg∙g–1 (86%) and 13.32 mg∙g–1 (94.3%) for Pb(II) was obtained in 250 and 330 min, respectively. Pseudo-first or-der and pseudo-second order models best fit experimental data, and Langmuir and Freundlich models well describe the iso-therm of the process. Thermodynamic parameters (ΔH0, ΔG0, ΔS0) suggest that the adsorption process of both cations is exothermic, irreversible, and not spontaneous.},
 type={Article},
 title={The kinetics, thermodynamics and equilibrium study of nickel and lead uptake using corn residues as adsorbent},
 URL={http://journals.pan.pl/Content/119064/PDF/23%20Tejada%20Tovar%20et%20al%20737.pdf},
 doi={10.24425/jwld.2021.136162},
 keywords={adsorption, corn wastes, heavy metals, kinetics, thermodynamics},
}