Comparison of two and three parameters adsorption isotherm for Cr(VI) onto Kraft lignin

Brdar, Mirjana; Šćiban, Marina; Takači, Arpad; Došenović, Tatjana

doi:10.1016/j.cej.2011.12.036

Cited by 224 publications

(103 citation statements)

References 15 publications

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“…Some basic reviews on various adsorption isotherm models are available in a number of literatures (Subramanyan and Das, 2009;Foo and Hamed, 2010;Yousef et al, 2011;Brdar et al, 2012). For current study, six appropriate models for gas-phase adsorptions were selected.…”

Section: Modeling Of Adsorption Properties and Error Functionsmentioning

confidence: 99%

“…Among these, adsorption capacity is considered as the most important property that is initially determined (Brdar et al, 2012). It has also been suggested that when describing adsorption properties, isotherm, thermodynamic and kinetic studies are required in order to fully understand the nature, mechanism and rate of the process prior to designing the application setup (Qui et al, 2009;Yousef et al, 2011;Song et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO 2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO 2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO 2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO 2 were desorbed below 500°C. The kinetic study indicated that CO 2 -AC interaction follows pseudo-second order while the higher R 2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO 2 -laden adsorbents at environmental levels.

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Section: Modeling Of Adsorption Properties and Error Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adelodun

Ngila

Kim

et al. 2016

Aerosol Air Qual. Res.

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show abstract

“…The Freundlich isotherm has been derived by assuming an expression encompassing the surface heterogeneity and the exponential distribution of active sites and their energies. The Freundlich isotherm shows that the heavy metal ions adsorption occurs on a heterogeneous surface by multilayer sorption [50,51]. The Freundlich isotherm is represented byEq.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Adsorption of Pb(II) ions from aqueous solution using lignin from Hagenia abyssinica

Tesfaw¹,

Chekol²,

Mehretie³

et al. 2017

Bull. Chem. Soc. Eth.

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ABSTRACT. The adsorption of lead(II) ions from aqueous solution onto alkali lignin extracted from Hagenia abyssinica was investigated by electrochemical methods. The effect of solution pH, lignin dosage and contact time were investigated at room temperature in a batch system. Adsorption equilibrium was approached within 80 min. The adsorption kinetics data were described by pseudo-second-order kinetics model, while the equilibrium data were well fitted using the Freundlich model. A maximum adsorption capacity was found to be 80.41 mg g -1 of the dry weight of lignin.

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“…Therefore, Freundlich isotherm can be applied to describe the heterogeneous adsorption systems (Ghorai and Pant 2005). The Redlich-Peterson isotherm, which contains three parameters, K R ,a R and b, also includes the features of Langmuir and Freundlich isotherm (Brdar et al 2012;Khaled et al 2009). This model has a linear dependence on concentration in the numerator and an exponential function in the denominator to describe adsorption equilibrium over a wide concentration range of adsorbate, thus can be applied for both homogeneous or heterogeneous systems due to its versatility (Foo and Hameed 2010).…”

Section: Isotherm Modelsmentioning

confidence: 99%

“…Among these, adsorbent capacity is the most important parameter which plays a vital role in overall process of adsorption (Oh and Park 2002;Gong et al 2005). The uptake capacity and adsorption performance are usually determined on the basis of equilibrium experiments and sorption isotherms describing the interaction of pollutant with the adsorbent material (Brdar et al 2012). The equilibrium studies are also very important in optimizing the design parameters for any adsorption system which provide sufficient information about physicochemical data to evaluate the adsorption process as a unit operation (Leyva-Ramos et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Isotherm investigation for the sorption of fluoride onto Bio-F: comparison of linear and non-linear regression method

Yadav

Singh

2017

Appl Water Sci

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A comparison of the linear and non-linear regression method in selecting the optimum isotherm among three most commonly used adsorption isotherms (Langmuir, Freundlich, and Redlich-Peterson) was made to the experimental data of fluoride (F) sorption onto Bio-F at a solution temperature of 30 ± 1°C. The coefficient of correlation (r 2 ) was used to select the best theoretical isotherm among the investigated ones. A total of four Langmuir linear equations were discussed and out of which linear form of most popular Langmuir-1 and Langmuir-2 showed the higher coefficient of determination (0.976 and 0.989) as compared to other Langmuir linear equations. Freundlich and Redlich-Peterson isotherms showed a better fit to the experimental data in linear least-square method, while in non-linear method Redlich-Peterson isotherm equations showed the best fit to the tested data set. The present study showed that the non-linear method could be a better way to obtain the isotherm parameters and represent the most suitable isotherm. Redlich-Peterson isotherm was found to be the best representative (r 2 = 0.999) for this sorption system. It is also observed that the values of b are not close to unity, which means the isotherms are approaching the Freundlich but not the Langmuir isotherm.

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Comparison of two and three parameters adsorption isotherm for Cr(VI) onto Kraft lignin

Cited by 224 publications

References 15 publications

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Isotherm, Thermodynamic and Kinetic Studies of Selective CO2 Adsorption on Chemically Modified Carbon Surfaces

Adsorption of Pb(II) ions from aqueous solution using lignin from Hagenia abyssinica

Isotherm investigation for the sorption of fluoride onto Bio-F: comparison of linear and non-linear regression method

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