Determination of axial dispersion and overall mass transfer coefficients for Ni (II) adsorption on nanostructured γ-alumina in a fixed bed column: experimental and modeling studies

Saadi, Reyhane; Saadi, Zahra; Fazaeli, Reza

doi:10.1080/19443994.2013.862869

Cited by 6 publications

(2 citation statements)

References 49 publications

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“…In addition, the non-linear Jovanovic model provided satisfactory results with R 2 values of 0.91 and 0.87 and slightly underestimated theoretical q m values of about 6% and 8% compared to the experimental values for Ni 2+ and Pb 2+ , respectively. Thus, similar to the Langmuir model, the nonlinear Jovanovic model supported the localized monolayer adsorption of both metal ions onto EU-biochar without lateral interactions, suggesting the development of mechanical interactions between the adsorbed and desorbed molecules [67,68].…”

Section: Evaluation Of the Adsorption Data Through Isotherm Fitting Modelssupporting

confidence: 56%

Kinetic and Isotherm Studies of Ni2+ and Pb2+ Adsorption from Synthetic Wastewater Using Eucalyptus camdulensis—Derived Biochar

2021

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The production of biosorbents by waste biomass has attracted considerable attention due to the low cost and abundance of the raw materials. Here biochar produced from Eucalyptus camdulensis sawdust (EU-biochar) via pyrolysis at 600 °C was used as a potential biosorbent for Ni2+ and Pb2+ metal ions from wastewater. Characterization experiments indicated the formation of C- and O-bearing functional groups on the EU-biochar surface, while shifts and changes in the shape of C–H bands suggested the adsorption of Ni2+ and Pb2+ onto EU-biochar by interacting with surface carboxylic groups. Pb2+ was adsorbed more quickly than Ni2+, indicating a faster and stronger interaction of Pb2+ with EU-biochar compared to Ni2+. As the initial concentrations of both metal ions increased, the percentage removal decreased, whereas increasing the EU-biochar dose improved the percentage removal but impaired the adsorption capacity for Ni2+ and Pb2+. The adsorption capacity could only be improved without affecting the percentage removal of both ions by increasing the pH of the metal solutions. The sorption efficiency of EU-biochar and the removal mechanism of Ni2+ and Pb2+ were further explored using non-linear and linear forms of kinetic and isotherm models.

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Section: Evaluation Of the Adsorption Data Through Isotherm Fitting Modelssupporting

confidence: 56%

Kinetic and Isotherm Studies of Ni2+ and Pb2+ Adsorption from Synthetic Wastewater Using Eucalyptus camdulensis—Derived Biochar

2021

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“…The suitability of the H-J model supports the multilayer adsorption of MB onto the Ec-bio with heterogeneous pore distribution, as also suggested by the Halsey and Freundlich isotherm models. Significantly close agreement of the Jovanovic isotherm to the adsorption data of the CV dye, with a high R 2 value (0.94) in the case of nonlinear fitting, suggested the localized monolayer adsorption of the CV dye onto the Ec-bio, as also suggested by the Langmuir isotherm, without lateral interactions, and suggests there are some mechanical interactions between the adsorbing and desorbing molecules [49,50]. As shown in Table 4, the model constant (K j , L g −1 ) was higher for the CV dye compared to the MB dye, while the theoretical q m value for the CV dye was in good agreement with the experimental value but that of the MB dye was underestimated using both nonlinear and linear fitting.…”

Section: Two-parameter Isotherm Models To Describe the Adsorption Pro...mentioning

confidence: 65%

Successful Application of Eucalyptus Camdulensis Biochar in the Batch Adsorption of Crystal Violet and Methylene Blue Dyes from Aqueous Solution

2021

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Eucalyptus camdulensis biochar (Ec-bio) was used to adsorb crystal violet (CV) and methylene blue (MB) dyes, which was optimized and further evaluated using different isotherm and kinetic models. Microscopy and spectroscopy techniques showed the interactions of the dyes with the surface functional groups of the Ec-bio, resulting in the removal of the dyes from aqueous solution. Both dyes were immediately uptaken, with equilibrium reached in 60 min, with a higher sorption efficiency of CV compared to MB. Thermodynamic parameters showed endothermic adsorption and the nonspontaneous adsorption of both dyes onto the Ec-bio. Both the adsorption capacity and percentage removal increased with the increasing solution pH from 2.0 to 4.0 and to 10 for CV and MB. An increase in adsorption capacity was observed upon increasing the initial concentrations, with a corresponding decrease in the percentage removal. The pseudo-second-order (PSO) and Elovich kinetic models (nonlinear approach) were a good fit to the data of both dyes, confirming a chemisorptive adsorption process. The Langmuir isotherm fitted well to the CV data, supporting its monolayer adsorption onto the Ec-bio, while the Freundlich isotherm was a good fit to the MB dye data, suggesting the surface heterogeneity of the Ec-bio. The Dubinin–Radushkevich isotherm was a good fit to the adsorption CV data compared with the MB dye, suggesting the physisorption of both dyes onto the Ec-bio due to its mean free energy of adsorption of <8 kJ mol−1.

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Modeling of polymeric adsorbent behavior

Mashhadimoslem,

Maleki,

Khosrowshahi

2024

Polymeric Adsorbents

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Determination of axial dispersion and overall mass transfer coefficients for Ni (II) adsorption on nanostructured γ-alumina in a fixed bed column: experimental and modeling studies

Cited by 6 publications

References 49 publications

Kinetic and Isotherm Studies of Ni2+ and Pb2+ Adsorption from Synthetic Wastewater Using Eucalyptus camdulensis—Derived Biochar

Kinetic and Isotherm Studies of Ni2+ and Pb2+ Adsorption from Synthetic Wastewater Using Eucalyptus camdulensis—Derived Biochar

Successful Application of Eucalyptus Camdulensis Biochar in the Batch Adsorption of Crystal Violet and Methylene Blue Dyes from Aqueous Solution

Modeling of polymeric adsorbent behavior

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