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In this study, co-precipitation synthesis of natural clay (NC) with Co 3 O 4 nanoparticles (NPs) is carried out to elaborate the super NC@Co 3 O 4 nanocomposites with admirable salinity confrontation, environmental stability and reusability, to eliminate heavy metal pollution such as toxic Pb(II) and Cd(II) ions. The advantages of using the NC@Co 3 O 4 adsorbent are easy synthesis and biocompatibility. In addition, NC@Co 3 O 4 can keep an excellent adsorption capacity by taking into account various environmental parameters such as the pH solution, NC@Co 3 O 4 dose, adsorption process time and the initial heavy metals concentration. Furthermore, FTIR, XRD, TGA, SEM-EDS, TEM and AFM analyses were performed to confirm NC@Co 3 O 4 nanocomposites synthesis and characterisation. The adsorption efficiencies of Pb(II) and Cd(II) ions by NC@Co 3 O 4 nanocomposites were demonstrated to be up to 86.89% and 82.06% respectively. Regarding the adsorption from water onto the NC@Co 3 O 4 nanocomposites, kinetics data were well fitted with PSO kinetic model, whereas a good agreement was found between the equilibrium adsorption and theoretical Langmuir isotherm model leading to maximum adsorption capacities of 55.24 and 52.91 mg/g, for Pb(II) and Cd(II) respectively. Monte Carlo (MC) simulations confirmed the spontaneous of this adsorption based on the negative values of E ads . The MC simulations were performed to highlight the interactions occurring between heavy metal ions and the surface of NC@Co 3 O 4 nanocomposites, these were well correlated with the experimental results. Overall the study showed that NC@Co 3 O 4 nanoadsorbents have strongly versatile applications and are well designed for pollutant removal from wastewater due to their unique adsorptive properties.
Mouden et al. (Thu,) studied this question.