Biosorption of nickel(II) ions onto Sargassum wightii: Application of two-parameter and three-parameter isotherm models

Vijayaraghavan, K.; Padmesh, T.V.N.; Palanivelu, K.; Velan, M.

doi:10.1016/j.jhazmat.2005.10.016

Cited by 775 publications

(340 citation statements)

References 16 publications

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“…Langmuir isotherm is an empirical model which assumes that adsorption take place monolayer (the adsorbed layer is one molecule in thickness) where adsorption can only occur in a finite (fixed) number of definite localized sites, that are identical and equivalent, with no lateral interaction and steric hindrance between the adsorbed molecules, even on adjacent sites 19 . Meanwhile, the Freundlich isotherm assumes that the adsorption process takes place on heterogeneous surfaces and adsorption capacity is related to the Cr (VI) concentration at equilibrium..…”

Section: Isotherms Adsorptionmentioning

confidence: 99%

Adsorption of Hexavalent Chromium From Aqueous Solutions Using Acid Activated of Natural Zeolite Collected From Ende-Flores, Indonesia

2017

Rasayan J Chem

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Natural zeolite collected from Ende-Flores Indonesia was characterized and activated with acid solution for Cr(VI) adsorption from aqueous solution. This natural zeolite is mainly composed of quartz and 50% mordenite. The kinetic adsorption modeling was fitted best with the pseudo-second-order model, whereas isotherm adsorption followed the Langmuir model with the maximum adsorption (Qmax) of NZ and ANZ are 0.189 mg/g and 1.040 mg/g. Moreover the ANZ was favorable for adsorption of Cr(VI) respectively.

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Section: Isotherms Adsorptionmentioning

confidence: 99%

Adsorption of Hexavalent Chromium From Aqueous Solutions Using Acid Activated of Natural Zeolite Collected From Ende-Flores, Indonesia

2017

Rasayan J Chem

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“…This is used to quantify the amount of adsorbate adsorbed on an adsorbent as a function of partial pressure of gas or concentration of liquidate at a distinct temperature. This empirical model assuming monolayer adsorption (the adsorbed layer is one molecule in thickness) may occur at a distinct number of the similar localized sites, without lateral interaction and steric hindrance between the adsorbed molecules, even on adjacent sites (Vijayaraghavan et al 2006). One may obtain the equilibrium concentration as follows,…”

Section: Langmuir Isothermmentioning

confidence: 99%

D2EHPA-impregnated alumina for adsorption of strontium ions in environmental samples

Kalal

Abdollahi

Ashoor

et al. 2016

Int. J. Environ. Sci. Technol.

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The alumina impregnated by the di-2-ethyl hexyl phosphoric acid was introduced to make more adsorption of strontium as well as to determine the optimal conditions. The influence of various parameters such as pH, equilibrium time, adsorbent mass, interfering ions, and various eluant agents for the desorption of the strontium ions, initial concentration, and temperature was investigated to find out the adsorption behavior of the adsorbent under different conditions. The adsorbent was characterized by the Fourier transform infrared spectroscopy. The experimental data were fitted on the two-parameter and three-parameter adsorption isotherm models. The Freundlich and Redlich-Peterson models have suitable fitting on the experimental data (R 2 = 0.9307). The kinetic models of adsorption were analyzed by the pseudo-firstand pseudo-second-order models. The results have been indicated that the pseudo-second-order kinetic model is more appropriate than the others. Advantages of our method were simple operation, less time for preparation of adsorbent, rapid phase separation, and capability to combine with various detection techniques. The method has been utilized to extract and the recovery of strontium ions in environmental aqueous samples.

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“…The kinetic of Cr (VI) adsorption on KOH-COP, some adsorption kinetic models, namely, pseudo-zero order adsorption kinetic model [4], pseudo-first-order adsorption kinetic model [4], pseudo-second order adsorption kinetic model [4], intraparticle diffusion model [5], Bangham's pore diffusion model [6], liquid film diffusion kinetic model [7], modified Freundlich kinetic model [8] and Elovich model [9] are investigated to describe the adsorbate uptake.…”

Section: B Kinetic Adsorption Modelsmentioning

confidence: 99%

“…The liquid film diffusion equation is presented by following [7]: (8) Where k lf is the external mass transfer coefficient (1/min).…”

Section: B6 Liquid Film Diffusion Kinetic Modelmentioning

confidence: 99%

“…The modified Freundlich equation is expressed by the following [8]: (9) where k mf is the apparent adsorption rate constant (L/g min), m mf is a constant, Ci is the initial Cr(VI) concentration (mg/L). The values of k mf and m mf are used empirically to evaluate the effect of surface loading and ionic strength on the adsorption process and also can be obtained from intercept and slope of linear of ln q t and ln t, respectively.…”

Section: B7 Modified Freundlich Kinetic Modelmentioning

confidence: 99%

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Kinetic Models on Chromium (VI) Adsorption onto Carbonized Oil Palm Kernel with Potassium Hydroxide Activation

2016

IJACEBS

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Abstract-Use of adsorption kinetic models for removal of chromium (VI) from aqueous solution by oil palm kernel with potassium hydroxide activation has been investigated. The adsorption capacity or amount of Cr(VI) adsorbed per unit mass of adsorbent was determined by the pseudo-zero order, pseudo-first order, pseudosecond order, intraparticle diffusion, Bangham pore diffusion, liquid film diffusion, modified Freundlich and Elovich models to describe the adsorption process. The kinetics data were marginally better fit with Elovich model as compared to other models. It is therefore suggest that the chemisorption was the rate controlling step for chromium (VI) adsorption onto the carbonized oil palm kernel with KOH activation as the adsorbent.

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Biosorption of nickel(II) ions onto Sargassum wightii: Application of two-parameter and three-parameter isotherm models

Cited by 775 publications

References 16 publications

Adsorption of Hexavalent Chromium From Aqueous Solutions Using Acid Activated of Natural Zeolite Collected From Ende-Flores, Indonesia

Adsorption of Hexavalent Chromium From Aqueous Solutions Using Acid Activated of Natural Zeolite Collected From Ende-Flores, Indonesia

D2EHPA-impregnated alumina for adsorption of strontium ions in environmental samples

Kinetic Models on Chromium (VI) Adsorption onto Carbonized Oil Palm Kernel with Potassium Hydroxide Activation

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