Treatment of Wastewater Containing Co(II) Ions Using Eggshell Nanoparticles: Kinetic and Equilibrium Investigations

Tabidi M.; Elshafie H.; Khaleel A.Q.; Jyothi S.R.; Pallathadka H.; Kadhum W.R.; Altimari U.S.; Jabbar A.M.; Quispe-Rodriguez I.; Rodriguez-Benites C. · Physical Chemistry Research (2024) · DOI: 10.22036/pcr.2024.463046.2540

Resumen

The sorption potential of eggshell nanoparticles as a cheap sorbent was studied in the removal of cobalt ions from aqueous solutions. Also, Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET), and Dynamic Light Scattering (DLS) analyses were employed to measure the features of eggshell nanoparticles. The highest uptake efficiency was 97.43%, which was attained at stirring rate of 200 rpm, contact time of 60 min, 4 g l-1 eggshell dose, Co(II) ion concentration of 20 mg l-1, temperature of 30 °C, contact time of 60 min, and pH 6. Also, the adsorption process followed the Langmuir isotherm model. Moreover, the pseudo-second-order kinetic model could describe the kinetic behavior of Co(II) ions adsorption better than the pseudo-first-order and intraparticle diffusion kinetic models. Further, the eggshell sorbent showed significant reusability, so the removal efficiency of Co(II) after 4 reutilize cycles did not change significantly and could remain its removal efficiency above 90%. Moreover, the adsorbent was able to eliminate effectively contaminants such as 5-day Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), and heavy metal ions from a real wastewater. Additionally, the influence of interfering ions including Zn(II), Pb(II), Cr(III) and Cr(VI), Hg(II), and As(III) was studied on the sorption performance of Co(II) ions, and the results revealed that Pb(II) and As(III) had the highest and lowest sorption efficiency, respectively. © (2024), (Iranian Chemical Society). All Rights Reserved.

Instituciones: Universidad Nacional de San Cristóbal de Huamanga; Universidad de Ciencias y Artes de América Latina