Theory of adsorption from nonelectrolyte solutions on solid adsorbents

Elovich, S. Yu.; Ларионов, О. Г.

doi:10.1007/bf00908017

Cited by 78 publications

(22 citation statements)

References 14 publications

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“…The calculated q e value was not in agreement with the experimental data, indicating that the pseudo-second-order kinetic model may not explain the adsorption of NP onto the modified MWCNTs. Preferably, the experimental adsorption capacity data well fit to the Elovich model, which implies that the NP adsorption is governed by chemisorption processes [54].…”

Section: Kinetic Model Parameter Value Rmentioning

confidence: 68%

“…Table 4 shows the adsorption isotherm models applied for the adsorption of NP onto MWCNTs. The Langmuir [55], Freundlich [56], Jovanovic [57], Elovich [54] and Temkin [58] models were respectively employed to fit the adsorption data, and the result is summarized (Table 4). In short, Freundlich, Jovanovic, Temkin, and Elovich models fitted the data better than the Langmuir.…”

Section: Equilibrium Adsorption Isothermmentioning

confidence: 99%

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Adsorption of Nonylphenol to Multi-Walled Carbon Nanotubes: Kinetics and Isotherm Study

et al. 2018

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We explored the occurrence and distribution of nonylphenol (NP) in 13 Taiwanese source waters. From all the surveyed waters, NP was detected at a high concentration, which could be attributed to contamination by wastewater discharges. In this study, we applied modified multi-walled carbon nanotubes (MWCNTs) for removing NP from aqueous solution. The impact of a few experimental factors, i.e., pH, contact time, MWCNTs dose, and temperature on the NP removal efficiency of modified MWCNTs was studied. The maximum adsorption capacity of the MWCNTs was observed to be 1040 mg NP/g when the initial NP concentration was 2.5 mg/L, and the solution pH was 4. The adsorption process followed the Elovich kinetics and the Elovich isotherm, indicating it is multilayer adsorption. The thermodynamic analysis demonstrated the NP adsorption by MWCNTs was thermodynamically satisfactory and, for the most part, endothermic as in the case of phenol adsorption. The result of the current study demonstrated the significance of free binding sites and the pore size of MWCNTs in the NP adsorption. This paper will help to better comprehend the adsorption behavior and mechanism of alkyl phenolic compounds onto MWCNTs.

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Section: Kinetic Model Parameter Value Rmentioning

confidence: 68%

Section: Equilibrium Adsorption Isothermmentioning

confidence: 99%

Adsorption of Nonylphenol to Multi-Walled Carbon Nanotubes: Kinetics and Isotherm Study

et al. 2018

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“…The adsorption capacity increased rapidly at the initial 30 min, and slowly in the following 90 min, and kept constant within the subsequent 120 min, indicating the adsorption was equilibrated in 120 min. The kinetics of adsorption of MB on MPs-3w, MPs 3–5 and GAC were studied as a function of adsorption time at 25 o C. As shown in Fig 6 , four typical kinetic models, such as Lagergren's pseudo-first order ( Eq 16 ), pseudo-second order kinetics model ( Eq 17 ), inter-particle diffusion model ( Eq 18 ) and kinetic model ( Eq 19 ) proposed by Elovich et al [ 42 ], were tested for the experimental data. The four kinetics models were expressed as follows: …”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of a magnetic adsorbent from negatively-valued iron mud for methylene blue adsorption

Liu

Zhu

et al. 2018

PLoS ONE

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With increasing awareness of reduction of energy and CO2 footprint, more waste is considered recyclable for generating value-added products. Here we reported the negatively-valued iron mud, a waste from groundwater treatment plant, was successfully converted into magnetic adsorbent. Comparing with the conventional calcination method under the high temperature and pressure, the synthesis of the magnetic particles (MPs) by Fe2+/Fe3+ coprecipitation was conducted at environment-friendly condition using ascorbic acid (H2A) as reduction reagent and nitric acid (or acid wastewater) as leaching solution. The MPs with major component of Fe3O4 were synthesized at the molar ratio (called ratio subsequently) of H2A to Fe3+ of iron mud ≥ 0.1; while amorphous ferrihydrite phase was formed at the ratio ≤ 0.05, which were confirmed by vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). With the ratio increased, the crystalline size and the crystallization degree of MPs increased, and thus the Brunauer-Emmett-Teller (BET) surface and the cation-exchange capacity (CEC) decreased. MPs-3 prepared with H2A to Fe3+ ratio of 0.1 demonstrated the highest methylene blue (MB) adsorption of 87.3 mg/g and good magnetic response. The adsorption of MB onto MPs agreed well with the non-linear Langmuir isotherm model and the pseudo-second-order model. Pilot-scale experiment showed that 99% of MB was removed by adding 10 g/L of MPs-3. After five adsorption-desorption cycles, MPs-3 still showed 62% removal efficiency for MB adsorption. When nitric acid was replaced by acid wastewater from a propylene plant, the synthesized MPs-3w showed 3.7 emu/g of saturation magnetization (Ms) and 56.7 mg/g of MB adsorption capacity, 2.8 times of the widely used commercial adsorbent of granular active carbon (GAC). The major mechanism of MPs adsorption for MB was electrostatic attraction and cation exchange. This study synthesized a magnetic adsorbent from the negatively-valued iron mud waste by using an environment-friendly coprecipitation method, which had a potential for treatment of dye wastewater.

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“…The Table 3 presents the results of the modeling of the experimental data by Weber and Morris kinetics model [9], the external diffusion kinetics model [10][11] and Elovich kinetics model [12].…”

Section: Models Of Molecular Diffusion Processmentioning

confidence: 99%

“…As regards the kinetics models based on the molecular diffusion process, they are based on the fact that the adsorption rate is determined by the molecular diffusion process. They correspond to several models including Weber and Morris kinetics model [9] (the intra-particle diffusion kinetics model), the diffusion in the liquid film kinetics model or the external diffusion kinetics model [10][11] and Elovich kinetics model [12]. [13].…”

Section: Introductionmentioning

confidence: 99%

Contribution to the Study of Phosphorus Adsorption Kinetics on the Superficial Sediments of a Recently Development Artificial Estuary: Vridi Channel (Côte d'Ivoire)

Samuel

Konan

Trokourey

2021

CSIJ

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The aim of this study is to characterize phosphates adsorption kinetics on the superficial sediments of Vridi channel from its new hydromorphology. So, three scenarios have been carried out taking account the different waters seasons of this estuary by using pH and temperature as relevant parameters. In the first scenario, the experiments carried out at pH = 8 and T = 20°C to simulate phosphates adsorption on these sediments in its great cold season. In the second, the experiments carried out at pH = 8 and T = 25° C to simulate phosphates adsorption on these substrates in its hot season and small cold season. In the third, the experiments carried out at pH = 7 and T = 30°C to simulate phosphates adsorption on these sediments in its flood season. The experiences were carried out according to US EPA/530/SW-87/006-F protocol. KH2PO4 solutions were used as phosphates synthetic solutions. The experimental data were modeling by Lagergeen kinetics model (pseudo-order 1), Blanchard kinetics model (pseudo-order 2), Elovich kinetics model, Weber and Morris kinetics model and, external diffusion kinetics model. The results have showed phosphates adsorption on these sediments increase in the experiments carried out at pH = 8 and T = 20°C to those carried out at pH = 7 and T = 30°C. All experimental data have been well modeling by Blanchard kinetics model. So, these phosphates adsorption kinetics are pseudo-order 2 and the chemisorption is the dominant mechanism. The results obtained by the experimental data modeling by Weber and Morris kinetics model and external diffusion kinetics model showed that this process is not limiting by the molecular diffusion process. The experimental data have been again well modeling by Elovich kinetics model. That has confirmed the chemisorption character of this adsorption, and showed this chemisorption is activated.

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Theory of adsorption from nonelectrolyte solutions on solid adsorbents

Cited by 78 publications

References 14 publications

Adsorption of Nonylphenol to Multi-Walled Carbon Nanotubes: Kinetics and Isotherm Study

Adsorption of Nonylphenol to Multi-Walled Carbon Nanotubes: Kinetics and Isotherm Study

Synthesis and characterization of a magnetic adsorbent from negatively-valued iron mud for methylene blue adsorption

Contribution to the Study of Phosphorus Adsorption Kinetics on the Superficial Sediments of a Recently Development Artificial Estuary: Vridi Channel (Côte d'Ivoire)

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