Ion-Exchange Equilibria of Cu2+, Cd2+, Zn2+, and Na+ Ions on the Cationic Exchanger Amberlite IR-120

Valverde, J.L.; Lucas, Antonio de; González, Marcela; Rodríguez, Juan F.

doi:10.1021/je010102k

Cited by 42 publications

(34 citation statements)

References 11 publications

(16 reference statements)

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“…Several physicochemical processes have been studied to remove heavy metals from aqueous solutions including precipitation, electrochemical treatment, membrane filtration, ion exchange and adsorption (Guillard and Lewis 2001;Valverde et al 2001;Matlock et al 2002;Ng et al 2002;Naiya et al 2009a). Among these treatments, biosorption can be considered as an eco-friendly and economical wastewater treatment that has been proven to be highly efficient to remove low metal concentration, and in addition, the biosorbent can be easily regenerated (Chojnacka 2010).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Cerino-Córdova

Diaz‐Flores

García-Reyes

et al. 2013

Int. J. Environ. Sci. Technol.

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In this research, spent coffee grains were modified with citric acid solutions (0.1 and 0.6 M) to increase the quantity of carboxylic groups improving its metal adsorption capacity. Added functional groups on modified and non-modified spent coffee grains were identified and quantified by attenuated total reflection Fourier transform infrared analyses and potentiometric titrations, respectively. These adsorbents were used for the removal of lead (II) and copper (II) from aqueous solutions at 30°C and different pH in batch systems. In addition, adsorptiondesorption experiments were conducted to evaluate the possibility of re-using the modified adsorbent. Potentiometric titrations data reveal that the quantity of carboxylic groups was increased from 0.47 to 2.2 mmol/g when spent coffee grains were modified with 0.1 and 0.6 M citric acid. Spent coffee grains treated with 0.6 M citric acid, achieved a maximum adsorption capacity of 0.77 and 1.53 mmol/g for lead (II) and copper (II), respectively, whereas nonmodified spent coffee grains only reached 0.24 and 0.19 mmol/g for lead (II) and copper (II), respectively. Desorption of lead (II) and copper (II) achieved around 70 % using 0.1 N HCl for non-modified and modified spent coffee grains with 0.6 M citric acid. It is suggested that lead (II) and copper (II) species were adsorbed mainly on the carboxylic groups of modified spent coffee grains and these metals may be exchanged for hydrogen and calcium (II) ions during adsorption on non-modified spent coffee grains. Finally, the adsorption equilibrium was reached after 400 min for modified spent coffee grains with 0.6 M citric acid. Modified spent coffee grains are a promising option for removing metal cations from aqueous solutions due to its low cost and high adsorption capacity (about 10 times higher than the activated carbons).

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Section: Introductionmentioning

confidence: 99%

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Cerino-Córdova

Diaz‐Flores

García-Reyes

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Widely used in ion exchange process studies, the Wilson model is based on Gibbs energy which differs from the ideality [9,[22][23][24][25][26]. The activity coefficient in the resin is expressed by the following relation in the case of the binary exchange:…”

Section: Activity Coefficient In Ier Phasementioning

confidence: 99%

“…An important restriction of single inclusion homogenization methods is that we are generally not able to choose separately a kind of inclusion shape and a spatial distribution. As explained previously, the IDD is a double inclusion type model; this means that two Eshelby tensors are used, one for the inclusion shape and the other for describing the spatial distribution [25,26], both selected independently. The first step is to calculate the average dilute strain localization tensor of IER inclusion as:…”

Section: Homogenized Stiffness Tensormentioning

confidence: 99%

Modelling of the interaction between chemical and mechanical behaviour of ion exchange resins incorporated into a cement-based matrix

Neji

Bary

Burlion

et al. 2013

EPJ Web of Conferences

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Abstract. In this paper, we present a predictive model, based on experimental data, to determine the macroscopic mechanical behavior of a material made up of ion exchange resins solidified into a CEM III cement paste. Some observations have shown that in some cases, a significant macroscopic expansion of this composite material may be expected, due to internal pressures generated in the resin. To build the model, we made the choice to break down the problem in two scale's studies. The first deals with the mechanical behavior of the different heterogeneities of the composite, i.e. the resin and the cement paste. The second upscales the information from the heterogeneities to the Representative Elementary Volume (REV) of the composite. The heterogeneities effects are taken into account in the REV by applying a homogenization method derived from the Eshelby theory combined with an interaction coefficient drawn from the poroelasticity theory. At the first scale, from the second thermodynamic law, a formulation is developed to estimate the resin microscopic swelling. The model response is illustrated on a simple example showing the impact of the calculated internal pressure, on the macroscopic strain.

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“…Systematic studies of this problem are scarce in the literature; most reports refer to low concentrations (0.1 N or less) with the reaction developing in only one direction (Tanaka et al 2000;Kuronen et al 2000;Altschuler et al 2004;Boyd et al 1974;Chen et al 1990;de Barros et al 2002;Heo et al 1990;Valverde et al 2001;Carmona et al 2008;Borge et al 1999;Sherry and Walton 1967;Miyata 1983). However some researchers e.g.…”

Section: Introductionmentioning

confidence: 99%

Na+/Cu2+ ion exchange equilibrium on Zeolite A: a thermodynamic study

Perişanu

Oancea

2015

Adsorption

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The ion exchange isotherms at 302 K for Na ? / Cu 2? and Cu 2? /Na ? on zeolite A were determined for six total equivalent concentrations of the external solution, in the range 0.05-2.1 eq/L. Interpolated points from the curves fitted with different isotherms were used in the calculation of the selectivity coefficients. The activity coefficients in the external solution were calculated by means of the Pitzer model. Thermodynamic equilibrium constant values corresponding to different total concentrations of the external solution have been obtained investigating the reaction from both sides. The method of Gaines and Thomas, revised by Soldatov, based on the dependence of the normalized Kielland selectivity quotients on the copper ionic fraction in the zeolite was used in order to obtain the thermodynamic equilibrium constant value. The significance of the thermodynamic equilibrium constant and the reversibility of the process were analyzed, as well as the influence of the non-ideality of the zeolite and solution phases.

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Ion-Exchange Equilibria of Cu²⁺, Cd²⁺, Zn²⁺, and Na⁺ Ions on the Cationic Exchanger Amberlite IR-120

Cited by 42 publications

References 11 publications

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Biosorption of Cu(II) and Pb(II) from aqueous solutions by chemically modified spent coffee grains

Modelling of the interaction between chemical and mechanical behaviour of ion exchange resins incorporated into a cement-based matrix

Na+/Cu2+ ion exchange equilibrium on Zeolite A: a thermodynamic study

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