A general kinetic model for adsorption: Theoretical analysis and modeling

Guo, Xuan; Wang, Jianlong

doi:10.1016/j.molliq.2019.111100

Cited by 352 publications

(106 citation statements)

References 27 publications

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“…As the adsorption time extended (beyond 10 min), the solute uptake amounts progressively diminished until the attainment of equilibrium at 120 min. The adsorption capacity reduction as contact time extended is due to the progressive saturation of the adsorption sites, thus limiting the uptake of more solutes (Guo et al, 2019). Similar equilibrium time as that obtained in this study has been previously reported by other authors that employed cellulose-based adsorbent in the uptake of different metal cations (Ebrahimi et al, 2015;Hashem, Badawy, et al, 2020;.…”

Section: Effect Of Adsorption Timesupporting

confidence: 88%

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Aniagor

Hussein

Farag

et al. 2021

Preprint

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Alhagi Graecorum (AG) is an invasive plant with a massive/robust root structure that can grow up to 12 feet into the ground. The present study exploited the rich cellulosic content in this ‘AG’ root for the synthesis of a novel biosorbent (‘MA’). This low-cost biosorbent, with high carboxyl content of 447.22 (m. eq /100 g sample) was utilised for aqueous zinc ion sequestration. The surface functional groups and textural characteristics required for an efficient heavy metal binding was identified on ‘MA’ using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Sip isotherm emerged as the model of best fit for equilibrium studies, hence, Zn (II) ion sorption onto ‘MA’ is believed to occur via a hybrid blend of homogenous monolayer and heterogeneous multilayer adsorption. Meanwhile, the Elovich (SNE = 1.0429), intraparticle diffusion (SNE = 1.0205) and pseudo-first-order (SNE = 1.0455) provided the best fitting for 200, 400 and 600 mg/L adsorption system, respectively. The maximum adsorption capacity of 188.67 mg/g was recorded at optimum adsorption conditions, with the predominance of the electrostatic and electron-donor-acceptor interaction mechanism. The abundant surface oxygenous functional groups on ‘MA’ positively influenced its adsorption capacity; thus, making it a promising biosorbent for aqueous Zn (II) uptake.

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Section: Effect Of Adsorption Timesupporting

confidence: 88%

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Aniagor

Hussein

Farag

et al. 2021

Preprint

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“…The adsorption rate can now be explained with a second‐order model. A similar transition from PFO to PSO with increasing loading has been found for CO 2 adsorption on platinum 25 and mesoporous silica 40 and has been discussed in general 37. As described above, Azizian provided a theoretical derivation based on the Langmuir isotherm model for this behavior 31.…”

Section: Resultssupporting

confidence: 64%

“…Alongside the first‐ and second‐order models, a vast number of mixed‐order models has been proposed to study sorption kinetics 22, 37–39. However, the nature of mixed‐order models hampers the comparison of sorption rate constants within the model, as they are not independent of the reaction order.…”

Section: Introductionmentioning

confidence: 99%

Study of CO₂ Sorption Kinetics on Electrospun Polyacrylonitrile‐Based Carbon Nanofibers

et al. 2021

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Electrospun carbon nanofibers (CNFs) exhibit a decent CO2 sorption capacity and outstanding CO2/N2 selectivity. In this work, the sorption rate as another practically relevant parameter for CO2 adsorption is analyzed for different carbonization temperatures. Equilibration curves obtained from different CO2 sorption isotherms are discussed qualitatively and quantitatively, employing empirical models for pseudo‐first‐ and second‐order reactions. The sorption rate constants are found to be highly dependent on the carbonization temperature of the CNFs and the applied pressure during the measurement. Furthermore, two distinct processes of sorption are observed, which are attributed to different sorption sites on the surface and the inner volume of the CNFs.

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“… 22 In the pseudo-first-order model, the adsorption rate depends on the amount adsorbed at equilibrium time, the amount adsorbed at any time, and the kinetic constant. 23 …”

Section: Introductionmentioning

confidence: 99%

Physicochemical Parameters of the Methylparaben Adsorption from Aqueous Solution Onto Activated Carbon and Their Relationship with the Surface Chemistry

2021

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The methylparaben adsorption from aqueous solution onto activated carbon is a relevant topic because of the toxicity of this compound for human and environmental health. The physicochemical parameters allow us to evaluate the performance of the adsorption and the relationship between the surface chemistry and the adsorbed amount of methylparaben. The effect of the solution chemistry on the adsorption was also evaluated. In this work, the methylparaben adsorption on three activated carbons with different physicochemical properties, specifically different contents of oxygenated groups and total basicity, is presented. Kinetic, equilibrium, and calorimetry tests were conducted. The maximum adsorbed amount of methylparaben was achieved on an activated carbon with basic characteristics, Q max = 1.64 mmol g –1 ; in the same activated carbon, the initial rate was 0.20 mmol g –1 h –1 , and the value determined for the interaction enthalpy was −12.6 × 10 –20 J molecules –1 , and the Gibbs energy change was close to −14.96 kJ mol –1 .

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A general kinetic model for adsorption: Theoretical analysis and modeling

Cited by 352 publications

References 27 publications

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Study of CO₂ Sorption Kinetics on Electrospun Polyacrylonitrile‐Based Carbon Nanofibers

Physicochemical Parameters of the Methylparaben Adsorption from Aqueous Solution Onto Activated Carbon and Their Relationship with the Surface Chemistry

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A general kinetic model for adsorption: Theoretical analysis and modeling

Cited by 352 publications

References 27 publications

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Study on the Uptake of Aqueous Zinc Ion Onto a Novel Organic Acid Modified Biosorbent

Study of CO2 Sorption Kinetics on Electrospun Polyacrylonitrile‐Based Carbon Nanofibers

Physicochemical Parameters of the Methylparaben Adsorption from Aqueous Solution Onto Activated Carbon and Their Relationship with the Surface Chemistry

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Study of CO₂ Sorption Kinetics on Electrospun Polyacrylonitrile‐Based Carbon Nanofibers