Investigation of Langmuir, Freundlich and Temkin Adsorption Isotherm of Tramadol by Multi-Wall Carbon Nanotube

Vadi, Mehdi; Mansoorabad, Asma Omidi; Mohammadi, Majid; Rostami, Nasrin

doi:10.14233/ajchem.2013.14786

Cited by 40 publications

(5 citation statements)

References 24 publications

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“…1/n usually < 1, if favorable adsorption 84 . Temkin model suggest uniform distribution of binding energies (up to maximum binding energy) and linearly decreasing of adsorption heat of particles in the layer regardless very low and very high concentrations 85 . Temkin adsorption isotherm is given by using Eqs.…”

Section: Resultsmentioning

confidence: 96%

Novel synthesis of Ni/Fe layered double hydroxides using urea and glycerol and their enhanced adsorption behavior for Cr(VI) removal

El-Reesh

Farghali

Taha

et al. 2020

Sci Rep

127

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Novel modified Ni/Fe layered double hydroxides with different morphology of spherical-like shape were fabricated via using urea as a ligand and glycerol (Ni/Fe LDH/GL) with Ni:Fe molar ratios of 2:1 by the simplest co-precipitation method. Also, for comparison purposes, Ni/Fe LDH was synthesized to be used as a control one. A suggested interpretation for the morphology change was also given. The materials were characterized by X-ray diffraction (XRD), The Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), EDX for elemental analysis, high resolution transmission electron microscopy (HRTEM), Brunauer, Emmett, and Teller (BET) equation, particle size distributions and Zeta potential measurements. In addition, the synthesized materials were used as adsorbents for removal of potassium dichromate from aqueous solutions under various experimental conditions. The adsorption of Cr (VI) was strongly pH dependant and the pH PZC was studied. Kinetic studies were evaluated through different models including, pseudo first and second orders, mixed 1, 2 orders, intra particle diffusion and Avrami models. For adsorption isotherms, twoparameter models (Langmuir, Freundlich and Temkin) and three parameter models (Sips, Langmuir-Freundlich and Tooth) were investigated showing maximum adsorption capacity of 50.43 mg/g and 136.05 mg/g for Ni/Fe LDH and Ni/Fe LDH/GL, respectively. Also, the effect of temperature was investigated at (23, 35, 45, 55 °C) and the thermodynamic parameters (∆H°, ∆S° and ∆G°) were calculated showing exothermic and spontaneous adsorption process. The effect of coexisting anions (cl − , So 4 2− and HPO 4 2−) and humic acid at different concentrations on the removal efficiency of dichromate ions was investigated. Chemical stability and recyclability of these adsorbents were also studied. The intermolecular hydrogen bonds formation between dichromate ion, urea, glycerol, LDH was explored by Monte Carlo simulation This study suggested that the modified Ni/Fe LDH/GL materials were promising nanoadsorbents for efficient potassium dichromate removal. Water is the most precious natural source important for human beings, agriculture, and industrial activities. Recently, water bodies are potentially contaminated and polluted by many hazardous materials such as nuclear and industrial wastes, pharmaceuticals, organic contaminants and heavy metals. Heavy metals like cadmium, zinc, copper, lead, arsenic, mercury and chromium have significant threat to human health due to its potentially toxic effects 1,2. Chromium is one of heavy metals widely used in many industrial processes such as electroplating, dyes, mining, photography, textile and leather 3. Chromium present in water in a trivalent and hexavalent oxidation state, it is established that hexavalent chromium exhibits high toxicity toward living organisms than trivalent chromium which in contrast is a micronutrient 4. Hexavalent chromium is reported as a cause of respiratory cancers 5,6 and mutations and chromosomal dam...

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Section: Resultsmentioning

confidence: 96%

Novel synthesis of Ni/Fe layered double hydroxides using urea and glycerol and their enhanced adsorption behavior for Cr(VI) removal

El-Reesh

Farghali

Taha

et al. 2020

Sci Rep

127

View full text Add to dashboard Cite

show abstract

“…It expresses the relationship between the interaction of adsorbate molecules on surface of adsorbent and equilibrium state of adsorption. The Temkin isotherm equation is also non-linear expression of the adsorption process and is used to calculate the adsorption capacity and rate [26]. These three models mathematically express the adsorption isotherms while addressing different aspects of the adsorption process and their interactions.…”

Section: Adsorption Isotherm and Kineticmentioning

confidence: 99%

Adsorption of Malachite Green Into Potato Peel: Nonlinear Isotherm and Kinetic

KÜÇÜK,

BİÇİÇİ

2024

KONJES

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Potato peels (PPs) were utilized for removal of malachite green (MG) from aqueous solutions. The adsorbent underwent characterization through attenuated total reflection fourier transform infrared spectroscopy (ATR-FTIR), Scanning electron microscope (SEM), point zero charge (pHPZC) X-Ray diffraction (XRD), and Energy dispersive X-ray spectroscopy (EDX). The removal of MG was found to be significantly influenced by pH, temperature, contact time, and initial concentration. Temperature and particle size were determined to have lesser influence compared to other factors. The adsorption process lasted for 120 minutes, with rapid removal occurring within the first 60 minutes. Adsorption kinetics were analyzed using the Elovich, pseudo first order, and pseudo second order models. The pseudo second order model was found to be more suitable for the kinetic study. Isotherm modeling was conducted using the Temkin, Freundlich, and Langmuir isotherms. Due to the exothermic nature of the study, the Freundlich and Langmuir models were found to be highly compatible. The maximum adsorption capacity was determined as 37.8 mg/g at 41°C. ATR-FTIR analysis revealed the involvement of hydroxide and carbonyl groups in the adsorption process. Overall, this study concluded that PPs is promising adsorbent for removal of MG from aqueous solutions.

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“…The Temkin isotherm is an isothermal adsorption model that describes the adsorption of an adsorbate on a heterogeneous surface. It assumes of a decrease in adsorption energy followed by a decrease in adsorbate concentration [30,31]. The linear form is:…”

Section: Log( ) Log Logmentioning

confidence: 99%

Cyanide removal by graphene-type oxidized biochar: kinetic study and adsorption isotherms

Yannick Daniel Djè,

Zoungranan Yacouba,

Dobi-Brice Kouadio Kouassi

et al. 2024

World J. Adv. Res. Rev.

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The use of biomass to convert it into valuable chemicals has recently attracted the interest of researchers. In this study, graphene-type oxidized biochar was synthesized by calcination using oil palm (Elaeis guineensis) seed hulls of the hybrid variety dura x pisifera as the main carbon source. Graphene-like oxidized biochar (BOGp) was prepared from BGp by modification of the oxidation method described by Panicker and colleagues. The influences of mass variation, concentration and contact time were investigated, respectively. The study showed that for 0.1 g of BOGp used in 50 mL of a 1 mg/L cyanide solution, the elimination rate is 65%, for an equilibrium time of 60 minutes, and the elimination process is chemisorption, which follows the pseudo-second-order kinetic model. Absorption is described by the Freundlich isotherm, confirming multilayer adsorption. The BOGp characteristics were analyzed using modern analytical methods. Characteristic analysis of the BOGp results indicated that it is a low-moisture material with a high ash percentage, a density of 0.71 and a zero-charge point pH of 4. DRX analysis showed characteristic graphitic carbon peaks at 2θ ≈ 26.03° followed by peaks at 2θ ≈ 10° and 2θ ≈ 43° characteristic of oxidized graphitic carbon. Infrared analysis revealed OH and C=O functions confirming BOGp oxidation and C=C and CH2 groups corresponding to the skeletal vibration of the graphene sheet.

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Investigation of Langmuir, Freundlich and Temkin Adsorption Isotherm of Tramadol by Multi-Wall Carbon Nanotube

Cited by 40 publications

References 24 publications

Novel synthesis of Ni/Fe layered double hydroxides using urea and glycerol and their enhanced adsorption behavior for Cr(VI) removal

Novel synthesis of Ni/Fe layered double hydroxides using urea and glycerol and their enhanced adsorption behavior for Cr(VI) removal

Adsorption of Malachite Green Into Potato Peel: Nonlinear Isotherm and Kinetic

Cyanide removal by graphene-type oxidized biochar: kinetic study and adsorption isotherms

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