فهرست نشریات علمی دسترسی آزاد ایران

The sorption potential of eggshell nanoparticles as a cheap sorbent was studied in the removal of cobalt ions from aqueous solutions. Also, SEM, BET, and DLS analyzes 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, 4 g/L eggshell dose, Co(II) ion concentration of 20 ppm, temperature of 30 oC, and pH 6. Also, 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 that 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 BOD5, 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.