Statistical physics interpretation of the adsorption mechanism of Pb2+, Cd2+ and Ni2+ on chicken feathers

Dhaouadi, Fatma; Sellaoui, Lotfi; Badawi, Michaël; Reynel-Ávila, Hilda Elizabeth; Mendoza-Castillo, Didilia I.; Jaime-Leal, José Enrique; Bonilla-Petriciolet, Adrián; Lamine, Abdelmottaleb Ben

doi:10.1016/j.molliq.2020.114168

Cited by 73 publications

(66 citation statements)

References 44 publications

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“…This might be related to the impact of temperature in the activation of new sites or the ion exchange process, causing a reduction in the number of captured As (V) per site. For PN/BE and G.Zn@PN/BE, the n values declined with temperature up to 30 • C and then increased again up to 40 • C. This was reported in the literature as a predicted result for the change in the effective retention sites with the temperature [49,50].…”

Section: Classic Isotherm Modelssupporting

confidence: 80%

“…This suggested that the retention of As (V) ions were of non-parallel and/or vertical orientation on the surfaces of the adsorbents. Additionally, this signifies the retention of the dissolved As (V) ions on the adsorption sites by a multi-ionic mechanism [48,49]. The determined n values for BE within the range from 3.09 up to 4.09 suggest the uptake of three or four As (V) ions per site on the surface of BE particles (Figure 7B; Table 2).…”

Section: Classic Isotherm Modelsmentioning

confidence: 89%

“…Regarding the effect of temperature, there is a considerable declination in the calculated values of the Nm parameter for BE with the increase in experimental temperature from 20 • C up to 40 • C (Figure 7E; Table 2). The previous behavior was credited to the increase in the aggregation of the adsorbed As (V) ions, which appeared significantly in the values of the n parameter [49]. The enhancement in the aggregation properties (n parameter) is associated with declination in the number of the occupied active sites.…”

Section: Density Of the Active Sites (Nm)mentioning

confidence: 96%

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Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

et al. 2022

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A green ZnO@polynaniline/bentonite composite (G.Zn@PN/BE) was synthesized as an enhanced adsorbent for As (V) ions. Its adsorption properties were assessed in comparison with the integrated components of bentonite (BE) and polyaniline/bentonite (PN/BE) composites. The G.Zn@PN/BE composite achieved an As (V) retention capacity (213 mg/g) higher than BE (72.7 mg/g) and PN/BE (119.8 mg/g). The enhanced capacity of G.Zn@PN/BE was studied using classic (Langmuir) and advanced equilibrium (monolayer model of one energy) models. Considering the steric properties, the structure of G.Zn@PN/BE demonstrated a higher density of active sites (Nm = 109.8 (20 °C), 108.9 (30 °C), and 67.8 mg/g (40 °C)) than BE and PN/BE. This declared the effect of the integration process in inducing the retention capacity by increasing the quantities of the active sites. The number of adsorbed As (V) ions per site (1.76 up to 2.13) signifies the retention of two or three ions per site by a multi-ionic mechanism. The adsorption energies (from −3.07 to −3.26 kJ/mol) suggested physical retention mechanisms (hydrogen bonding and dipole bonding forces). The adsorption energy, internal energy, and free enthalpy reflected the exothermic, feasible, and spontaneous nature of the retention process. The structure is of significant As (V) uptake capacity in the existence of competitive anions or metal ions.

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Section: Classic Isotherm Modelssupporting

confidence: 80%

Section: Classic Isotherm Modelsmentioning

confidence: 89%

Section: Density Of the Active Sites (Nm)mentioning

confidence: 96%

See 1 more Smart Citation

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

et al. 2022

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“…The adsorption energy expression was written as given in Eq. (2) ( Sellaoui et al, 2017 ; Dhaouadi et al, 2020a ; Sellaoui et al, 2020a ; Dhaouadi et al, 2020b ; Sellaoui et al, 2020b ; Seliem et al, 2020 ; Sellaoui et al, 2021b ; Landin-Sandoval et al, 2021 ).

where R is the universal gas constant (8.314 kJ/mol) and Cs is the solubility of Cr(VI) and Mn(VII) in water.…”

Section: Resultsmentioning

confidence: 99%

Insights Into the Mn(VII) and Cr(VI) Adsorption Mechanisms on Purified Diatomite/MCM-41 Composite: Experimental Study and Statistical Physics Analysis

et al. 2022

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In this study, a purified diatomite (PD) with a concentration of diatom frustules more than 92% SiO2 was utilized to synthesize a composite of MCM-41 silica under hydrothermal conditions. The as-synthesized PD/MCM-41 composite was characterized and tested as an adsorbent for the removal of Cr(VI) and Mn(VII) ions from aqueous solution. Results of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR) revealed that the diatom frustules of the PD were coated with MCM-41 mesoporous silica. Experimental isotherms of Cr(VI) and Mn(VII) adsorption were fitted to classical and advanced statistical physics models at 25°C–55°C and pH 3. The Langmuir model estimated monolayer adsorption capacities ranging from 144.1 to 162.2 mg/g for Cr(VI) and 166.2 to 177.0 mg/g for Mn(VII), which improved with increasing the solution temperature. Steric and energetic parameters obtained from a monolayer adsorption model with one adsorption site was utilized to explain the adsorption mechanism at a microscopic level. The number of Cr(VI) and Mn(VII) ions adsorbed on PD/MCM-41 active site (n) were 1.25–1.27 for Cr(VI) and 1.27–1.32 for Mn(VII), thus suggesting multi-interaction mechanisms. The density of PD/MCM-41 active sites (DM) was a key parameter to explain the adsorption of these heavy metals. The adsorbed quantities were maximum at 55°C, thus obtaining 102.8 and 110.7 mg/g for Cr(VI) and Mn(VII), respectively. Cr(VI) and Mn(VII) adsorption energies ranged from 18.48 to 26.70 kJ/mol and corresponded to an endothermic adsorption with physical forces. Entropy, free enthalpy, and internal energy associated to the adsorption of Cr(VI) and Mn(VII) ions were calculated, thus indicating that the removal of these pollutants was spontaneous. Overall, this article offers new interpretations for the Cr(VI) and Mn(VII) adsorption mechanisms on PD/MCM-41 composite, which are relevant to contribute to the development of effective water treatment processes.

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“…In the past few years, many methods that can be categorized as physical purification [5], chemical purification [6], and biological purification [7] have been developed for the removal of Pb ions from different water environments. Among these, the most common methods used in the treatment of Pb-containing wastewater are coagulation precipitation, chemical precipitation, light-induced conversion, filtration, bioremediation, ozonation, and adsorption.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pb(II) from Aqueous Solutions Using Nanocrystalline Cellulose/Sodium Alginate/K-Carrageenan Composite Hydrogel Beads

Shen

Ouyang

et al. 2021

J Polym Environ

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Based on the excellent performances of nanocrystalline cellulose, sodium alginate, or K-carrageenan in Pb 2+ adsorption, nanocrystalline cellulose/sodium alginate/K-carrageenan composite hydrogel beads were prepared to adsorb Pb(II) from aqueous solutions. The objective of this study was to demonstrate the excellent potential of the composite hydrogel beads for heavy metal ion adsorption. We successfully prepared ecofriendly Fe-modified nanocrystalline cellulose/sodium alginate/Kcarrageenan composite hydrogel beads and characterized them. The structure and adsorption mechanism were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, and the optimal adsorption conditions were determined. The tricomponent hydrogel beads were robust and exhibited improved adsorption capacity for Pb 2+ and good reusability. The adsorption results could be fitted well with a pseudo-second-order kinetic model and the Langmuir adsorption model. The maximum adsorption capacity obtained by fitting was 351.04 mg g −1 .Recycling experiments revealed that the adsorption capacity of the adsorbent remained high after five cycles of reuse.

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Statistical physics interpretation of the adsorption mechanism of Pb2+, Cd2+ and Ni2+ on chicken feathers

Cited by 73 publications

References 44 publications

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

Insights Into the Mn(VII) and Cr(VI) Adsorption Mechanisms on Purified Diatomite/MCM-41 Composite: Experimental Study and Statistical Physics Analysis

Adsorption of Pb(II) from Aqueous Solutions Using Nanocrystalline Cellulose/Sodium Alginate/K-Carrageenan Composite Hydrogel Beads

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