Equilibrium kinetic and thermodynamic studies of Cr(VI) adsorption onto a novel adsorbent of Eucalyptus camaldulensis waste: Batch and column reactors

Haroon, Hajira; Ashfaq, Tayyab; Gardazi, Syed Mubashar Hussain; Sherazi, Tauqir A.; Ali, Muhammad; Rashid, Naim; Bilal, Muhammad

doi:10.1007/s11814-016-0160-0

Cited by 60 publications

(23 citation statements)

References 41 publications

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“…The negative values of ΔS suggest that the biomass has an affinity for the ion and strong bonds are formed on the surface, making the process irreversible; these results confirm what is shown by the FTIR and SEM-EDS analysis, as well as the fit of the equilibrium data to Freundlich's model [53]. The positive values of Gibbs' free energy indicate that the adsorption process is not spontaneous, favourable and that reactions are not feasible at moderate temperatures [52], [54].…”

Section: Thermodynamic Parameterssupporting

confidence: 76%

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Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

Tovar

Villabona-Ortíz

Cortina-Góngora

et al. 2021

Rev.Fac.Ing.Univ.Antioquia

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The presence of heavy metals in aqueous media represents a severe threat to ecosystems because they are non-biodegradable, toxic, and carcinogenic. In the present work, the utilization of agro-industrial residues from obtaining plantain starch for removing Ni (II) was studied, establishing the effect of temperature, adsorption dose, and initial concentration. The kinetics, equilibrium, and thermodynamic parameters that determine the process were studied. For this purpose, tests were carried out in a batch system maintaining constant stirring (200 rpm), pH (2), and solution volume (100 mL). The remaining metal concentration was determined by atomic adsorption at 237 nm. It was found that the best adsorption conditions were given at 55 ºC, 0.6775 g, and 368 mg/L obtaining a maximum adsorption capacity of 47.57 mg/g corresponding to a removal of 87%. The kinetic model that best fits the experimental data was a pseudo-second-order model, and the isotherm that describes the process is Langmuir and Freundlich, so the adsorption is given by chemisorption and multilayers. The thermodynamic parameters determined suggest that the process is favourable, not spontaneous, endothermic, and irreversible under the studied conditions. The results show that the residual biomass from the obtaining of plantain starch is a good precursor for absorbing Ni (II) in an aqueous solution.

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Section: Thermodynamic Parameterssupporting

confidence: 76%

“…The number of species adsorbed does not exceed the number of active sites [51]. The value of Freundlich's constant n is in the range 1-10, so the electrostatic interactions and links formed between the ions and the active centres are strong, indicating that the process is favourable with high adsorption intensity [44], [52].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

Tovar

Villabona-Ortíz

Cortina-Góngora

et al. 2021

Rev.Fac.Ing.Univ.Antioquia

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“…The positive value of Δ 0 due to the exchange of the Ce(III) ions with more mobile ions present on the exchanger, which would lead to increase in the entropy in the sorption process (Tamjidi et al 2019). The positive values of Δ 0 suggested that Ce (III) sorption at various temperatures was thermodynamically non-spontaneous in nature for the both sorbents (Ahmad et al 2011;Haroon et al 2016;Yi et al, 2017;Sangkarak et al 2020). ΔH° and ΔS° values were positive, confirming that adsorption system of Ce(III) onto the MNP and MOP at the test temperatures was endothermic.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

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

Akbas

Yuşan

Sert

et al. 2021

Environ Sci Pollut Res

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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.

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“…The particle size at adsorption is a determining parameter, as it is related to the surface contact area of the bio-adsorbent and the availability of active sites [15], [35]. In Figure 4, the effect of particle size for Pb(II) and Ni(II) using lemon peel is shown.…”

Section: Particle Size Effectmentioning

confidence: 99%

“…The negative values of ΔS suggest that the biomass has an affinity for the ion forming strong bonds on the surface, thus obtaining a low possibility of reversibility [7]. The positive values of Gibbs' free energy indicate that the adsorption process is not spontaneous or favourable, and the reaction is not feasible at high temperatures [35], [58]. However, Figure 12 shows the gradual increase in the adsorption capacity of Ni (II) in the presence of Pb (II).…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Adsorption in a binary system of Pb (II) and Ni (II) using lemon peels

Tovar

Sierra-Ardila

Meza-Acuña

et al. 2020

Rev.Fac.Ing.Univ.Antioquia

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The elimination of pollutants in water sources is a widely studied issue with the purpose of preserving the environment. In this work, the use of lemon peel (citrus lemon) as a bio-sorbent in the removal of Pb (II) and Ni (II) is studied, varying the temperature, adsorbent dose, and particle size. The materials were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analysis, to determine the bio adsorbent’s physicochemical properties. FTIR and EDS techniques confirmed the precipitation of ions on the adsorbent after the adsorption process. It was found that the optimal conditions according to the Response Surface Methodology (RSM) are: particle size for Ni (II) of 1 and 0.355 mm, adsorbent dose 0.077 g and 0.117 g, and temperatures of 34 and 45 ºC, for Pb (II) and Ni (II), respectively. The results reported that the Dubinin-Radushkevich isotherm and the pseudo-second-order model are more in line with the experimental data, suggesting that the adsorption process is driven by physisorption and occurs in multilayers. Thermodynamic parameters suggest that the process is exothermic for Ni (II) and endothermic for Pb (II), and irreversible. The binary study showed that there is no competition for active sites between the ions.

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Equilibrium kinetic and thermodynamic studies of Cr(VI) adsorption onto a novel adsorbent of Eucalyptus camaldulensis waste: Batch and column reactors

Cited by 60 publications

References 41 publications

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

Use of agro-industrial residues of plantain (Musa paradisiaca) in the adsorption of Ni (II)

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

Adsorption in a binary system of Pb (II) and Ni (II) using lemon peels

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