Sorption of Ce(III) on magnetic/olive pomace nanocomposite: isotherm, kinetic and thermodynamic studies

Abstract

Used for various high-tech applications, cerium is an important rare earth element (REE) and its sorption on various solids also important considering purification, environmental and radioactive waste disposal, In view of the industrial and environmental terms, it is important to remove Ce 3+ ions from an aqueous solution. Magnetite and magnetic olive pomace nanocomposite were thus fabricated by a partial reduction co-precipitation approach.The structure and morphological properties of the prepared nano-material and nanocomposite were characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), Vibrating Sample Magnetometry (VSM) and BET surface area analysis. The effects of parameters such as solution pH, contact time, initial Ce(III) concentration and temperature on the sorption efficiency were studied. The maximum sorption capacities of the magnetite (MNP) and magnetic olive pomace nanocomposite (MOP) for Ce(III) ions were found to be 76.92 and 90.90 mgg -1 , respectively. The sorption data fitted well with Dubinin-Radushkevich isotherm model and the pseudo-second order kinetic model. Thermodynamic parameters indicated that the sorption was non-spontaneous and endothermic. The present study introduced MNP and MOP as efficient, sustainable adsorbents alternative to commercial ones in wastewater treatment.

Developing a Chromatographic 99mTc Generator Based on Mesoporous Alumina for Industrial Radiotracer Applications: A Potential New Generation Sorbent for Using Low-Specific-Activity 99Mo

“…These results indicate that adsorption of CA- 99 Mo on the sorbents (AA-11501, SA-267740, SA-199966, SA-517747, and SA-544833) occurred mainly through multilayer adsorption at heterogeneous surfaces [ 39 , 44 ]. The Freundlich adsorption constant (n f ) represents the adsorption intensity, for example: (i) n f < 1 (a chemical process), (ii) n f = 1 (linear adsorption), and (iii) n f > 1 (physisorption) [ 44 ].…”

“…These results indicate that adsorption of CA- 99 Mo on the sorbents (AA-11501, SA-267740, SA-199966, SA-517747, and SA-544833) occurred mainly through multilayer adsorption at heterogeneous surfaces [ 39 , 44 ]. The Freundlich adsorption constant (n f ) represents the adsorption intensity, for example: (i) n f < 1 (a chemical process), (ii) n f = 1 (linear adsorption), and (iii) n f > 1 (physisorption) [ 44 ]. The n f values presented in Table 2 are higher than 1, indicating that the CA- 99 Mo adsorption on commercial alumina sorbents used in this study was physisorption and favorable under the current experimental conditions.…”

Removal of lanthanum and cerium from aqueous solution using chitosan-functionalized magnetite-pectin

“…At 25 mg/L, the concentration of metal ions is supposed to have the highest adsorption percentage of 68% and 82% for La(III) and Ce(III), respectively. On the other hand, the adsorption capacities of La(III) and Ce(III) by MPC increased with initial metal concentration and reached an equilibrium, which can be demonstrated by the theory that mass transfer driving at the solid-liquid interface is enhanced as the initial concentration increases [25].…”

Adsorption performance of Pb(II) ions on green synthesized GO and rGO: Isotherm and thermodynamic studies

“…The role of solution pH is very important to remove the adsorbents from aqueous solutions. Because it affects the surface charge of the adsorbent and states of the functional groups of adsorbents as well as the adsorbate [41]. To study the influence of pH upon % removal rate of Pb(II) of synthesized materials, the experiments were conducted in the pH range of 3-6 at room temperature with 100 mg/L lead and the equilibrium time was kept 30 minutes.…”