Statistical Mechanical Study on the Freundlich Isotherm Equation

Yang, Chung-hai

doi:10.1006/jcis.1998.5843

Cited by 229 publications

(111 citation statements)

References 15 publications

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“…The most common models used to express adsorption are Freundlich and Langmuir isotherms [7,8]. The adsorption isotherm experiments were performed on Pb(II), Cd(II) and Cr(III) on magnetite surface at 298 K. The results were correlated to both models and illustrated.The linearity in the plot of 1/q e versus 1/C e is depicted in Fig.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

2017

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NANO-MAGNETITE was used as an eco-friendly sorbent (without the usage of surfactants during the synthesis) for removing Pb(II), Cd(II) and Cr(III) from water and wastewater. A single 7 nm cubic phase for magnetite was ascertained by X-Rays diffraction (XRD) and high resolution transmission electron microscope (HRTEM).Field emission scanning electron microscopy (FESEM) image showed the agglomeration of magnetite particles upon adsorption. The Langmuir isotherm was used to estimate the maximum adsorption capacities of 576.4, 144.3 and 301.0 mg/g for Pb(II), Cd(II) and Cr(III), respectively.The adsorption mechanism followed a pseudo-second order kinetics.The studied competing cations and anions showed minor effects on the rate of adsorption.Magnetite with high adsorption ability adsorbed Pb(II), Cd(II) and Cr(III) from a ternary mixture as effectively as from their individual solutions. The presented sorbent can be regenerated by 1% HNO 3 with a recovery percent of 91.4 % and reused with an adsorption efficiency of 84.1 % compared to the freshly prepared magnetite. As an example of application, the nano-magnetite was used to decontaminate river water-samples from lead ions.

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Section: Adsorption Isothermmentioning

confidence: 99%

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

2017

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“…[11][12] The Freundlich isotherm (1906) is applicable to both monolayer (chemisorption) and multilayer adsorption (physisorption) and is based on the assumption that the adsorbate adsorbs onto the heterogeneous surface of an adsorbent. [13] www.wjpps.com …”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Highly Efficient Adsorption of Cd(ii) From Aqueous Solutions by Aluminum Oxide Nanoparticles

Hussain¹

2017

WJPPS

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In this study, Aluminum oxide nanoparticles were evaluated for Cd (II) removal from aqueous solution by batch adsorption method. The batch experiments showed that Aluminum oxide nanoparticles can be effectively used to remove Cd (II) from aqueous solution. Maximum removal of Cd (II) was obtained at pH=6 and adsorption equilibrium was achieved in 30 min. The adsorption kinetics well fitted using pseudo second-order kinetic model. The heavy metals sorption has been well explained using Langmuir and Freundlich isotherm model.The results indicated that the high adsorption capacity of Aluminum oxide nanoparticles makes them promising material for heavy metal ions removal from water samples.

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“…The Freundlich isotherm is applicable to both monolayer (chemisorption) and multilayer adsorption (physisorption) [51]. The linear form of Freundlich equation is expressed as:…”

Section: Isotherm Modelsmentioning

confidence: 99%

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

2014

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Abstract:The adsorption of tributyltin (TBT), onto three mesoporous silica adsorbents functionalized with calix [4]arene, p-tert-butylcalix[4]arene and p-sulfonatocalix [4]arene (MCM-TDI-C4, MCM-TDI-PC4 and MCM-TDI-C4S, respectively) has been compared. Batch adsorption experiments were carried out and the effect of contact time, initial TBT concentration, pH and temperature were studied. The Koble-Corrigan isotherm was the most suitable for data fitting. Based on a Langmuir isotherm model, the maximum adsorption capacities were 12.1212, 16.4204 and 7.5757 mg/g for MCM-TDI-C4, MCM-TDI-PC4 and MCM-TDI-C4S, respectively. The larger uptake and stronger affinity of MCM-TDI-PC4 than MCM-TDI-C4 and MCM-TDI-C4S probably results from van der Waals interactions and the pore size distribution of MCM-TDI-PC4. Gibbs free energies for the three adsorption processes of TBT presented a negative value, reflecting that TBT/surface interactions are thermodynamic favorable and spontaneous. The interaction processes were accompanied by an increase of entropy value for MCM-TDI-C4 and MCM-TDI-C4S (43.7192 and 120.7609 J/mol K, respectively) and a decrease for MCM-TDI-PC4 (−37.4704 J/mol K). It is obviously observed that MCM-TDI-PC4 spontaneously adsorbs TBT driven mainly by enthalpy change, while MCM-TDI-C4 and MCM-TDI-C4S do so driven mainly by entropy changes.

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Statistical Mechanical Study on the Freundlich Isotherm Equation

Cited by 229 publications

References 15 publications

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

Toxic Heavy Metal Ionsremoval From Wastewater Bynano-Magnetite: Case Study Nile River Water

Highly Efficient Adsorption of Cd(ii) From Aqueous Solutions by Aluminum Oxide Nanoparticles

Comparative Study of Tributyltin Adsorption onto Mesoporous Silica Functionalized with Calix[4]arene, p-tert-Butylcalix[4]arene and p-Sulfonatocalix[4]arene

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