Adsorption of cobalt from aqueous solutions onto sepiolite

Kara, Mustafa; Yüzer, Hayrettin; Sabah, Eyüp; Çelik, M.S.

doi:10.1016/s0043-1354(02)00265-8

Cited by 438 publications

(186 citation statements)

References 20 publications

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“…Values of the enthalpy changes (∆H), always negative, are indicative of an exothermic process, and their magnitudes (<40 kJ/mol) show the adsorption of phenol on β-CD polymer within the range investigations in this study to be a physical adsorption in nature. 36 The positive entropy changes (∆S) indicated that the degrees of freedom increased at the solid-liquid interface during the adsorption. The obtained Gibbs free energy changes (∆G) are negative at all of the tested temperatures range from 15 to 60 o C, confirming that the adsorption of phenol on β-CD polymer is spontaneous and thermodynamically favorable.…”

Section: Resultsmentioning

confidence: 99%

Adsorption kinetics and thermodynamics of water-insoluble crosslinked β-cyclodextrin polymer for phenol in aqueous solution

Fan

Wang

et al. 2013

Macromol. Res.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract: A water-insoluble β-cyclodextrin (β-CD) polymer was synthesized by reacting β-CD with hexamethylene diisocyanate, and its adsorption kinetics and thermodynamics for phenol from aqueous solution was investigated. The kinetics of adsorption followed the pseudo-second-order model and the adsorption isotherms could be well fitted by the Freundlich adsorption equation. The values of thermodynamic parameters demonstrated that the adsorption was a physisorption in a spontaneous and exothermic process.

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Section: Resultsmentioning

confidence: 99%

Adsorption kinetics and thermodynamics of water-insoluble crosslinked β-cyclodextrin polymer for phenol in aqueous solution

Fan

Wang

et al. 2013

Macromol. Res.

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“…6). All the H 0 values, −36.87, −28.39, and −37.24 kJ mol −1 , were less than 40 kJ mol −1 thereby implying that the sorption of atrazine onto MWCNTs is mainly a physisorption process [38,39]. The negative S 0 indicated decreased randomness at the solid-liquid interface during sorption of atrazine.…”

Section: Thermodynamic Analysismentioning

confidence: 93%

Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Chen

Shan

Zhou

et al. 2009

Journal of Hazardous Materials

139

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a b s t r a c tThe adsorption kinetics, isotherms and thermodynamic of atrazine on multiwalled carbon nanotubes (MWCNTs) containing 0.85%, 2.16%, and 7.07% oxygen was studied. Kinetic analyses were performed using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The regression results showed that the pseudo-second-order law fit the adsorption kinetics. The calculated thermodynamic parameters indicated that adsorption of atrazine on MWCNTs was spontaneous and exothermic. Standard free energy ( G 0 ) became less negative when the oxygen content of MWCNTs increased from 0.85% to 7.07% which is consistent with the low adsorption affinity of MWCNTs for atrazine.

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“…The Frendlich isotherm appeared to be linear within the whole concentration range with high correlation coefficient, which certified that the Frendlich isotherm could excellently describe the monolayer adsorption processes when the equilibrium adsorption amount (q max ) and adsorption constant (k) were found to increase with the increase of temperature. Thermodynamic evaluation of adsorption process the type of adsorption can be determined through thermodynamic quantities as ∆H ads and ∆S [31] . The adsorption process is composed of two contributions, i.e., enthalpic and entropic, which characterize whether the reaction is spontaneous or not.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Characterization and Adsorption Mechanism of Pb (II) Removal by Insolubilized Humic Acid in Polluted Water

Ma¹,

Wei

Zhao³

et al. 2014

IJEPP

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Abstract:The removal of Pb 2+ in the aqueous solutions by adsorption onto insolubilized humic acid (IHA) is investigated. The equilibrium isotherms were determined at pH 3.5 under constant ionic strength and at different temperatures. At the same time, the paper has also analyzed the adsorption experimental data by using three different isotherm models: Langmuir, Frendlich and Linear isotherm. As the result, it has obtained the optimal correlation for Frendlich isotherm equations. In addition, the paper has calculated the thermodynamic quantities ∆H in accordance with the Clausius-Claperyon , s theory. It means that the type of adsorption of Pb 2+ onto IHA is physisorption, rather than by chemical bonding. And finally, the adsorption equilibrium gained around 12 hours and a high and stable removal of heavy metals on insoluble humic acid has been obtained almost under the neutral conditions.

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Adsorption of cobalt from aqueous solutions onto sepiolite

Cited by 438 publications

References 20 publications

Adsorption kinetics and thermodynamics of water-insoluble crosslinked β-cyclodextrin polymer for phenol in aqueous solution

Adsorption kinetics and thermodynamics of water-insoluble crosslinked β-cyclodextrin polymer for phenol in aqueous solution

Adsorption kinetics, isotherms and thermodynamics of atrazine on surface oxidized multiwalled carbon nanotubes

Characterization and Adsorption Mechanism of Pb (II) Removal by Insolubilized Humic Acid in Polluted Water

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