Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

Malferrari, Daniele; Brigatti, Maria Franca; Laurora, Angela; Pini, Stefano; Medici, Luca

doi:10.1016/j.jhazmat.2006.08.069

Cited by 47 publications

(23 citation statements)

References 28 publications

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“…Smectites posses the ability to shrink and swell, and a (reversible) incorporation of cations, organic molecules or water can occur (Parker and Rae 1998;Li et al 2006;Malfrerrari et al 2007). Therefore, smectites are suitable to absorb or adsorb xenobiotics, and especially cationic structures, due to a high negative charge of the minerals (Usman et al 2005).…”

Section: Discussionmentioning

confidence: 99%

Ionic liquids in soils: effects of different anion species of imidazolium based ionic liquids on wheat (Triticum aestivum) as affected by different clay minerals and clay concentrations

et al. 2008

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This study contributes to a prospective hazard assessment of ionic liquids, focusing on the terrestrial environment. The influence of differently composed soils-varying contents of the clay minerals smectite and kaolinite-on the toxicity of different anion species of imidazolium based ionic liquids was studied for growth inhibition of wheat (Triticum aestivum). IM14 (CF(3)SO(2))(2)N appeared the most toxic, independently of the investigated soil type. The toxicity of IM14 Cl, IM14 BF(4) and IM14 HSO(4) was mainly dominated by the cationic moiety. The observed effects varied in dependence of the added clay type and clay concentration. An increase of clay content resulted in less pronounced effects of these substances. In contrast, for IM14 (CF(3)SO(2))(2)N the addition of clay minerals caused higher toxic effects in comparison to the reference soil. Our results give first hints for the assumption, that ionic liquids whose toxic action is based on the anionic moiety are especially hazardous for soils, particular for soils with high clay contents.

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Section: Discussionmentioning

confidence: 99%

Ionic liquids in soils: effects of different anion species of imidazolium based ionic liquids on wheat (Triticum aestivum) as affected by different clay minerals and clay concentrations

et al. 2008

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“…Involved in organic as environmental friendliness [4,12,13]. Both montmorillonite and vermiculite are typical for 2:1 expandable clay minerals, which consist of two tetrahedral silica sheets with a central octahedral alumina or magnesia layer [14]. The interaction mechanism between natural clay minerals and metal ions occurs not only by cation exchange, which is a consequence of the permanent negative charge in the interlayer, but also by the formation of innerand outer-sphere complexes involving silanol or aluminol groups at the particle edges [12,15,16].…”

Section: Introductionmentioning

confidence: 99%

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Tran

Zhu

et al. 2015

Applied Surface Science

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“…(Fig.5) represents the effect of initial pH of the solution on the adsorption of cadmium(II) onto KAO.1 and MKB using 50 mg/L initial cadmium (II) concentration and 0.5 g of adsorbent, in the present study the pH was varied between 3 and 10. The lower adsorption at pH less than 6 this may be attributed to the competition between the hydrogen and cadmium ions on the sorption sites (Malferrari et al, 2007). At pH values higher than 8.0 insoluble cadmium hydroxide starts, precipitating from the solutions making true sorption studies impossible (Yang et al, 2001;Yu et al, 2007).…”

Section: Effect Of Initial Ph On Cadmium(ii) Ion Adsorptionmentioning

confidence: 99%

Adsorption of cadmium(II) ions from aqueous solution onto kaolinite and metakaolinite

Essomba¹,

Nsami²,

Belibi³

et al. 2014

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The removal of cadmium(II) ions from aqueous solution by adsorption on kaolinite (KAO.1) and metakaolinite (MKB) was investigated depending on the initial concentration, adsorbents dosage, initial pH of solution, and contact time. The influences of those factors have been experimentally verified by a batch method at (27±3 °C). These results have showed that the amount of cadmium(II) ions adsorbed increases with increased contact time and that equilibrium adsorption is reached in 10 minutes, the optimum value of pH was 8.0 and the effect of absorbent dose for the uptake of cadmium(II) ions by kaolinite and metakaolinite was found to decrease by increasing the adsorbent dose. The experimental results obtained are described by Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich (D-K-R) isotherm models. The Langmuir and D-K-R adsorption isotherms described the adsorption data very well. The maximum adsorption capacity; Q max , determined from the Langmuir adsorption isotherm studies was found to be 7.407 and 9.174 mg/g for KAO.1 and MKB respectively. Pseudo-first order, pseudo-second order, Elovich and the intraparticular diffusion kinetic models were used to describe the kinetic data obtained. The experimental data fitted well to the pseudo-second order kinetic model, which indicates that 12Jean Serge ESSOMBA et al.chemical adsorption is the rate-limiting step. The results indicate that kaolinite and metakaolinite adsorb cadmium(II) ions efficiently and could be employed as a low-cost alternative in waste water treatment for the elimination of cadmium(II) ions.

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Sorption kinetics and chemical forms of Cd(II) sorbed by thiol-functionalized 2:1 clay minerals

Cited by 47 publications

References 28 publications

Ionic liquids in soils: effects of different anion species of imidazolium based ionic liquids on wheat (Triticum aestivum) as affected by different clay minerals and clay concentrations

Ionic liquids in soils: effects of different anion species of imidazolium based ionic liquids on wheat (Triticum aestivum) as affected by different clay minerals and clay concentrations

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Adsorption of cadmium(II) ions from aqueous solution onto kaolinite and metakaolinite

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