Thermodynamic Properties of Heavy Metals Ions Adsorption by Green Adsorbents

Sahmoune, Mohamed Nasser

doi:10.1007/978-3-319-92111-2_6

Cited by 14 publications

(6 citation statements)

References 70 publications

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“…The efficiency of water treatment by adsorption was assessed based on the nature of the adsorption mechanism, which can be chemisorption or physisorption depending on the thermodynamic parameters [63][64][65]. In the investigation, ΔG o indicates the possibility of spontaneous adsorption, ΔH o is applied to indicate the nature of the adsorption process, and ΔS o gives information about the degree of randomness [66][67][68][69][70].…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Investigation of adsorptive removal of heavy metals onto magnetic core–double shell nanoparticles: kinetic, isotherm, and thermodynamic study

El-Toni,

Habila,

Sheikh

et al. 2024

Mater. Res. Express

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The most perilous environmental hazards arise from the contamination of water by heavy metal ions, owing to the non-biodegradability of these metals, as well as their rapid dissemination throughout components of the environment via the food chain. Nano-based adsorbents have been used for the adsorption removal of many heavy metal cations, but separating and recycling them represent significant difficulties in processing. Magnetic core–double shell nanoparticles provide an attractive solution for processing issues, since they are stable and can be easily separated and recycled. Moreover, the shell thickness, composition, and porosity can be easily tuned. In this work, two samples consisting of magnetic core@TiO2@mesoSiO2 nanoparticles with two shell thicknesses (Mag-T-S-0.2 and Mag-T-S-0.4), along with a magnetic core@SiO2@TiO2 nanoparticle sample (Mag-S-T), were synthesized and characterized by TEM, XRD, magnetic strength measurement and zeta potential. TEM images show the developed core–double shell structure with double shell ranging from 60 to 73 nm. The XRD results indicate the impact of the outer shell on the diffraction pattern. The zeta potential shows that all samples had a negative charge at pH over 4. The magnetic character was suppressed after the formation of the double-shell coating; however, the magnetic core–double shell nanoparticles still had magnetization and could be separated when an external magnetic field was applied. The heavy metal adsorptive ability of Mag-T-S-0.2, Mag-T-S-0.4, and Mag-S-T samples was explored to investigate the effects of shell type and thickness along with kinetic, isotherm, and thermodynamic study. The investigated heavy metals included Cd(II), Ni(II), Mn(II), Pb(II), and Cu(II). The results indicate that, for Mag-T-S-0.2, the equilibrium state occurred after 15 min contact time, with adsorption capacity of 238, 230, 210.6, 181.8, and 245.8 mg/g for Cd(II), Ni(II), Mn(II), Pb(II), and Cu(II), respectively. For Mag-T-S-0.4, the equilibrium state occurred after 15 min contact time, with adsorption capacity of 241, 237.6, 173.8, 189.6, and 257.2 mg/g, respectively. For

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Section: Thermodynamic Studiesmentioning

confidence: 99%

Investigation of adsorptive removal of heavy metals onto magnetic core–double shell nanoparticles: kinetic, isotherm, and thermodynamic study

El-Toni,

Habila,

Sheikh

et al. 2024

Mater. Res. Express

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“…According to the FD model, the ions must overcome the hydrodynamic layer resistance in order to penetrate the liquid film surrounding the bead and the rate of reaction is determined by the distance the ions need to travel to reach the bead surface, the thickness of the boundary layer and the velocity of the bulk solution (Sahmoune 2018). Among the ions that fit this model well, the diffusion of Cd was the highest on BP and PP beads, whereas Hg was the fastest on 5).…”

Section: Film and Pore Diffusion Kineticsmentioning

confidence: 99%

Simultaneous removal of heavy metals from drinking water by banana, orange and potato peel beads: a study of biosorption kinetics

et al. 2021

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Banana, orange and potato peels (BP, OP and PP, respectively) were immobilised to produce biosorbent beads that were employed for the biosorption of heavy metals from a cocktail solution containing As(V), Cd(II), Cr(VI), Cu(II), Hg(II) and Ni(II) ions. Drinking water conditions were maintained with neutral initial pH and low concentration of the ions. Batch experiments were performed for evaluating the effect of pH in the drinking water range (6.5–8.5). Results showed a significant increase in the biosorption capacity of the beads with respective to the uptake of As and Pb, whereas it decreased significantly for Cd, Cu, Hg and Ni ions at basic pH values. Approximate equilibrium biosorption of Cd, Cu, Hg and Ni was 89–92%, 79–87%, 84% and 71–80% by BP, OP and PP beads. The physisorption-based PFO model was the most suitable for the ions with biosorption capacities closer to the experimental values. BP and OP beads had better biosorption efficiencies relative to PP bead due to the higher surface heterogeneity observed by scanning electron microscopy coupled with energy-dispersive spectroscopy. An increase in the biosorbent concentration from one to ten BP beads significantly increased the biosorption percentage of the ions. The biosorption capacities of Cd, Hg and Ni uptake by one BP bead from a 1 mgL−1 cocktail solution were 3.4 ± 0.0, 5.3 ± 0.1 and 3.0 ± 0.0 mgg−1, respectively. Thus, BP beads were the most effective than for the simultaneous removal of heavy metals from drinking water.

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“…In contrast, in chemical adsorption, the heat of adsorption is high i.e. about 40-400 kJ/mol (Sahmoune, 2018). Moreover, adsorption can be divided into chemical adsorption and physical adsorption, both of which can occur simultaneously in one adsorption process.…”

Section: Thermodynamics Of Adsorptionmentioning

confidence: 99%

“…Therefore, it could be concluded that the rate-limiting step of Cu(II) adsorption onto AAC may be ion exchange followed by chemisorption at high temperature. Some authors consider ion exchange process as a chemisorption mechanism (Sahmoune, 2018).…”

Section: Adsorption Kinetics Modelingmentioning

confidence: 99%

Equilibrium, Kinetic, and Thermodynamic Study of The Adsorption of Cu(II) From Aqueous Solution Using Activated Carbon Derived From Acacia

Alshuiref,

Maraie,

Bseibsu

et al. 2020

JMSET

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The mechanism of adsorption behavior of thermally activated carbon prepared from Acacia (AAC) for copper ions from aqueous solutions has been investigated at optimum conditions of removal in a batch system. The experimental data were analyzed by the Langmuir, Freundlich, Timken, and Dubinin- Zaverina-Radushkevich adsorption isotherm models of adsorption. The characteristic parameters for each isotherm and related coefficients of determination have been determined. Thermodynamic parameters have also been evaluated. The kinetics of the sorption were analyzed using the Simple First Order, pseudo-first-order, pseudo-second-order, and Intra-Particle Diffusion kinetic models. Kinetic parameters, rate constants, equilibrium sorption capacities, and related coefficient of determination for each kinetic model were calculated and discussed. It was shown that the adsorption of copper could be described by the pseudo-second-order model, and it has been found that the adsorption process was feasible, spontaneous, and endothermic, suggesting that the adsorption process is presumably chemisorption. The AAC investigated in this study showed good potential for the removal of copper from aqueous solutions. So, the present study shows the feasibility of the practical use of AAC as a low-cost, and natural material adsorbent for the effective removal of Cu(II) ions from aqueous solutions as an alternative to existing commercial adsorbents.

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Thermodynamic Properties of Heavy Metals Ions Adsorption by Green Adsorbents

Cited by 14 publications

References 70 publications

Investigation of adsorptive removal of heavy metals onto magnetic core–double shell nanoparticles: kinetic, isotherm, and thermodynamic study

Investigation of adsorptive removal of heavy metals onto magnetic core–double shell nanoparticles: kinetic, isotherm, and thermodynamic study

Simultaneous removal of heavy metals from drinking water by banana, orange and potato peel beads: a study of biosorption kinetics

Equilibrium, Kinetic, and Thermodynamic Study of The Adsorption of Cu(II) From Aqueous Solution Using Activated Carbon Derived From Acacia

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