Internally consistent representation of binary ion exchange equilibria

Ioannidis, Socrates; Anderko, Andrzej; Sanders, Stephen

doi:10.1016/s0009-2509(99)00540-0

Cited by 24 publications

(42 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An alternative method which allows the calculation of the thermodynamic equilibrium constant was used by Ioannidis et al (2000) which involves the Wilson equation (Wilson 1964) for correlating the activity coefficients of the solid solution. Similar approaches using Wilson's equation have been also used by other authors including (Valverde et al 2001;Carmona et al 2008;Pabalan 1994;Smith and Woodburn 1978).…”

Section: Resultsmentioning

confidence: 99%

“…A remarkable thermodynamic exchange equilibrium study is that of Ioannidis et al (2000) who have used data at total electrolyte concentrations up to 0.5 N, using model parameters for the zeolite solid solution, derived independently of the equilibrium constant (Pabalan 1994). Ferapontov et al (2000Ferapontov et al ( , 2006 have investigated the ion exchange H ?…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Perişanu

Oancea

2015

Adsorption

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Perişanu

Oancea

2015

Adsorption

View full text Add to dashboard Cite

show abstract

“…The K v for each data point was calculated using the solid and aqueous-phase concentrations they provided. The aqueous-phase activity coefficients were calculated with the Extended Bromely model (Zemaitis et al, 1986), which has been used previously in ion-exchange thermodynamics studies (Ioannidis et al, 2000). The aqueous-phase concentrations that Evangelou and Lumbarnraja (2002) reported in molarity units were assumed to be the same in the molality units used by the Extended Bromley model.…”

Section: Test Datamentioning

confidence: 99%

“…(5), the K eq for each reaction must be known. A number of approaches for defining and determining K eq have been developed (Babcock et al, 1951;Babcock and Duckart, 1980;Sposito, 1981;Ioannidis et al, 2000;Sverjensky, 2003). Grant and Sparks (1989) discussed two possibilities methods for determining K eq for use within Eq.…”

Section: Test Datamentioning

confidence: 99%

“…Ioannidis et al (2000) noted that the standard state does not have to be the same for both ions, even if a standard state is chosen that is not the end members. They noted that the thermodynamic analysis was less accurate if the end members are used as the standard state because the end member compositions are outside the range of most experimental datasets (see also the Electronic Supplemental Section in Appendix A).…”

Section: Test Datamentioning

confidence: 99%

See 1 more Smart Citation