TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela Ž.
AU  - Miladinović, Jelena
AU  - Miladinović, Zoran P.
AU  - Rajaković-Ognjanović, Vladana N.
AU  - Pastor, Ferenc
AU  - Mladenović, Anja
PY  - 2024-03
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7259
AB  - This study present estimation of the thermodynamic parameters and the influence of ionic activity coefficient on the thermodynamic equilibrium constant of adsorption of phosphates on fly ash. The adsorption was conducted over a wide range of initial phosphate concentrations at different pH values pH = (3; 7; 10). The adsorption results were treated using the Langmuir, Freundlich and Sips adsorption isotherms, which provide information about the maximum adsorption capacity. The Langmuir and Sips isotherms were a satisfactory fit to the adsorption data, especially at pH = 3, with an acceptable regression coefficient over the entire concentration range, Langmuir (r2 = 0.9737) and Sips (r2 = 0.9969). The estimated maximum phosphate sorption capacity of fly ash was 6.21 ± 0.68 (mmol·g−1) according to Langmuir and 4.19 ± 0.16 (mmol·g−1) according to the Sips model, at pH = 3.0. However, there is no data in the published literature for estimating the thermodynamic parameters of the phosphate adsorption process using thermodynamic models for activity coefficients. Novel approach of this paper was determination of the thermodynamic equilibrium constant and Gibbs free energy, using the Pitzer ion-interaction model to predict the nature of adsorption. The Pitzer-ion interaction model was used for the mixed ionic systems, taking into consideration the effect of other present ions besides phosphates in the equilibrium solution resulting from fly ash desorption. The procedure for comprehensive estimation of the ion activity coefficient at maximum adsorption capacity and the dimensionless thermodynamic equilibrium constant using Langmuir's and Sips's constants was presented. The calculated value of the phosphate activity coefficient in the equilibrium solution was γH = 0.7003 ± 0.0027 and the converted molar activity coefficient was γH = 0.6903 ± 0.0027. The estimated values of Gibbs free energy were: ΔGL = −6.788 ± 0.521 kJ·mol−1 based on Langmuir equilibrium constant and ΔGa = −7.707 ± 0.527 kJ·mol−1 based on activity and thermodynamic equilibrium constant. According to Sips model, the adsorption process is even more spontaneous, with the Gibbs free energy calculated using the phosphate activity coefficient and the thermodynamic equilibrium constant, ΔGa = −9.707 ± 0.617 kJ·mol−1. Consideration of the ionic activity coefficient is particularly important for large, charged adsorbates at higher concentrations, as the absolute difference in free energy for adsorption is app. 12 %. The scientific contribution is reflected in obtaining the necessary and more accurate information for the improvement of adsorption processes and possibly for the upgrading of fly ash in overall wastewater treatment technology.
PB  - Elsevier B.V.
T2  - Journal of Molecular Liquids
T1  - Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions
SP  - 124097
VL  - 397
DO  - 10.1016/j.molliq.2024.124097
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela Ž. and Miladinović, Jelena and Miladinović, Zoran P. and Rajaković-Ognjanović, Vladana N. and Pastor, Ferenc and Mladenović, Anja",
year = "2024-03",
abstract = "This study present estimation of the thermodynamic parameters and the influence of ionic activity coefficient on the thermodynamic equilibrium constant of adsorption of phosphates on fly ash. The adsorption was conducted over a wide range of initial phosphate concentrations at different pH values pH = (3; 7; 10). The adsorption results were treated using the Langmuir, Freundlich and Sips adsorption isotherms, which provide information about the maximum adsorption capacity. The Langmuir and Sips isotherms were a satisfactory fit to the adsorption data, especially at pH = 3, with an acceptable regression coefficient over the entire concentration range, Langmuir (r2 = 0.9737) and Sips (r2 = 0.9969). The estimated maximum phosphate sorption capacity of fly ash was 6.21 ± 0.68 (mmol·g−1) according to Langmuir and 4.19 ± 0.16 (mmol·g−1) according to the Sips model, at pH = 3.0. However, there is no data in the published literature for estimating the thermodynamic parameters of the phosphate adsorption process using thermodynamic models for activity coefficients. Novel approach of this paper was determination of the thermodynamic equilibrium constant and Gibbs free energy, using the Pitzer ion-interaction model to predict the nature of adsorption. The Pitzer-ion interaction model was used for the mixed ionic systems, taking into consideration the effect of other present ions besides phosphates in the equilibrium solution resulting from fly ash desorption. The procedure for comprehensive estimation of the ion activity coefficient at maximum adsorption capacity and the dimensionless thermodynamic equilibrium constant using Langmuir's and Sips's constants was presented. The calculated value of the phosphate activity coefficient in the equilibrium solution was γH = 0.7003 ± 0.0027 and the converted molar activity coefficient was γH = 0.6903 ± 0.0027. The estimated values of Gibbs free energy were: ΔGL = −6.788 ± 0.521 kJ·mol−1 based on Langmuir equilibrium constant and ΔGa = −7.707 ± 0.527 kJ·mol−1 based on activity and thermodynamic equilibrium constant. According to Sips model, the adsorption process is even more spontaneous, with the Gibbs free energy calculated using the phosphate activity coefficient and the thermodynamic equilibrium constant, ΔGa = −9.707 ± 0.617 kJ·mol−1. Consideration of the ionic activity coefficient is particularly important for large, charged adsorbates at higher concentrations, as the absolute difference in free energy for adsorption is app. 12 %. The scientific contribution is reflected in obtaining the necessary and more accurate information for the improvement of adsorption processes and possibly for the upgrading of fly ash in overall wastewater treatment technology.",
publisher = "Elsevier B.V.",
journal = "Journal of Molecular Liquids",
title = "Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions",
pages = "124097",
volume = "397",
doi = "10.1016/j.molliq.2024.124097"
}

Ivanović, T., Popović, D. Ž., Miladinović, J., Miladinović, Z. P., Rajaković-Ognjanović, V. N., Pastor, F.,& Mladenović, A.. (2024-03). Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. in Journal of Molecular Liquids
Elsevier B.V.., 397, 124097.
https://doi.org/10.1016/j.molliq.2024.124097

Ivanović T, Popović DŽ, Miladinović J, Miladinović ZP, Rajaković-Ognjanović VN, Pastor F, Mladenović A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. in Journal of Molecular Liquids. 2024;397:124097.
doi:10.1016/j.molliq.2024.124097 .

Ivanović, Tijana, Popović, Daniela Ž., Miladinović, Jelena, Miladinović, Zoran P., Rajaković-Ognjanović, Vladana N., Pastor, Ferenc, Mladenović, Anja, "Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions" in Journal of Molecular Liquids, 397 (2024-03):124097,
https://doi.org/10.1016/j.molliq.2024.124097 . .

TY  - DATA
AU  - Ivanović, Tijana
AU  - Popović, Daniela Ž.
AU  - Miladinović, Jelena
AU  - Miladinović, Zoran P.
AU  - Rajaković-Ognjanović, Vladana N.
AU  - Pastor, Ferenc
AU  - Mladenović, Anja
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7332
AB  - This study present estimation of the thermodynamic parameters and the influence of ionic activity coefficient on the thermodynamic equilibrium constant of adsorption of phosphates on fly ash. The adsorption was conducted over a wide range of initial phosphate concentrations at different pH values pH = (3; 7; 10). The adsorption results were treated using the Langmuir, Freundlich and Sips adsorption isotherms, which provide information about the maximum adsorption capacity. The Langmuir and Sips isotherms were a satisfactory fit to the adsorption data, especially at pH = 3, with an acceptable regression coefficient over the entire concentration range, Langmuir (r2 = 0.9737) and Sips (r2 = 0.9969). The estimated maximum phosphate sorption capacity of fly ash was 6.21 ± 0.68 (mmol·g−1) according to Langmuir and 4.19 ± 0.16 (mmol·g−1) according to the Sips model, at pH = 3.0. However, there is no data in the published literature for estimating the thermodynamic parameters of the phosphate adsorption process using thermodynamic models for activity coefficients. Novel approach of this paper was determination of the thermodynamic equilibrium constant and Gibbs free energy, using the Pitzer ion-interaction model to predict the nature of adsorption. The Pitzer-ion interaction model was used for the mixed ionic systems, taking into consideration the effect of other present ions besides phosphates in the equilibrium solution resulting from fly ash desorption. The procedure for comprehensive estimation of the ion activity coefficient at maximum adsorption capacity and the dimensionless thermodynamic equilibrium constant using Langmuir's and Sips's constants was presented. The calculated value of the phosphate activity coefficient in the equilibrium solution was γH = 0.7003 ± 0.0027 and the converted molar activity coefficient was γH = 0.6903 ± 0.0027. The estimated values of Gibbs free energy were: ΔGL = −6.788 ± 0.521 kJ·mol−1 based on Langmuir equilibrium constant and ΔGa = −7.707 ± 0.527 kJ·mol−1 based on activity and thermodynamic equilibrium constant. According to Sips model, the adsorption process is even more spontaneous, with the Gibbs free energy calculated using the phosphate activity coefficient and the thermodynamic equilibrium constant, ΔGa = −9.707 ± 0.617 kJ·mol−1. Consideration of the ionic activity coefficient is particularly important for large, charged adsorbates at higher concentrations, as the absolute difference in free energy for adsorption is app. 12 %. The scientific contribution is reflected in obtaining the necessary and more accurate information for the improvement of adsorption processes and possibly for the upgrading of fly ash in overall wastewater treatment technology.
PB  - Elsevier B.V.
T2  - Journal of Molecular Liquids
T1  - Supplementary material for the article: Ivanović, T.; Popović, D. Ž.; Miladinović, J.; Miladinović, Z. P.; Rajaković-Ognjanović, V. N.; Pastor, F. ; Mladenović, A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. Journal of Molecular Liquids 2024, 397, 124097. https://doi.org/10.1016/j.molliq.2024.124097
SP  - 124097
VL  - 397
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7332
ER  - 

@misc{
author = "Ivanović, Tijana and Popović, Daniela Ž. and Miladinović, Jelena and Miladinović, Zoran P. and Rajaković-Ognjanović, Vladana N. and Pastor, Ferenc and Mladenović, Anja",
year = "2024",
abstract = "This study present estimation of the thermodynamic parameters and the influence of ionic activity coefficient on the thermodynamic equilibrium constant of adsorption of phosphates on fly ash. The adsorption was conducted over a wide range of initial phosphate concentrations at different pH values pH = (3; 7; 10). The adsorption results were treated using the Langmuir, Freundlich and Sips adsorption isotherms, which provide information about the maximum adsorption capacity. The Langmuir and Sips isotherms were a satisfactory fit to the adsorption data, especially at pH = 3, with an acceptable regression coefficient over the entire concentration range, Langmuir (r2 = 0.9737) and Sips (r2 = 0.9969). The estimated maximum phosphate sorption capacity of fly ash was 6.21 ± 0.68 (mmol·g−1) according to Langmuir and 4.19 ± 0.16 (mmol·g−1) according to the Sips model, at pH = 3.0. However, there is no data in the published literature for estimating the thermodynamic parameters of the phosphate adsorption process using thermodynamic models for activity coefficients. Novel approach of this paper was determination of the thermodynamic equilibrium constant and Gibbs free energy, using the Pitzer ion-interaction model to predict the nature of adsorption. The Pitzer-ion interaction model was used for the mixed ionic systems, taking into consideration the effect of other present ions besides phosphates in the equilibrium solution resulting from fly ash desorption. The procedure for comprehensive estimation of the ion activity coefficient at maximum adsorption capacity and the dimensionless thermodynamic equilibrium constant using Langmuir's and Sips's constants was presented. The calculated value of the phosphate activity coefficient in the equilibrium solution was γH = 0.7003 ± 0.0027 and the converted molar activity coefficient was γH = 0.6903 ± 0.0027. The estimated values of Gibbs free energy were: ΔGL = −6.788 ± 0.521 kJ·mol−1 based on Langmuir equilibrium constant and ΔGa = −7.707 ± 0.527 kJ·mol−1 based on activity and thermodynamic equilibrium constant. According to Sips model, the adsorption process is even more spontaneous, with the Gibbs free energy calculated using the phosphate activity coefficient and the thermodynamic equilibrium constant, ΔGa = −9.707 ± 0.617 kJ·mol−1. Consideration of the ionic activity coefficient is particularly important for large, charged adsorbates at higher concentrations, as the absolute difference in free energy for adsorption is app. 12 %. The scientific contribution is reflected in obtaining the necessary and more accurate information for the improvement of adsorption processes and possibly for the upgrading of fly ash in overall wastewater treatment technology.",
publisher = "Elsevier B.V.",
journal = "Journal of Molecular Liquids",
title = "Supplementary material for the article: Ivanović, T.; Popović, D. Ž.; Miladinović, J.; Miladinović, Z. P.; Rajaković-Ognjanović, V. N.; Pastor, F. ; Mladenović, A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. Journal of Molecular Liquids 2024, 397, 124097. https://doi.org/10.1016/j.molliq.2024.124097",
pages = "124097",
volume = "397",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7332"
}

Ivanović, T., Popović, D. Ž., Miladinović, J., Miladinović, Z. P., Rajaković-Ognjanović, V. N., Pastor, F.,& Mladenović, A.. (2024). Supplementary material for the article: Ivanović, T.; Popović, D. Ž.; Miladinović, J.; Miladinović, Z. P.; Rajaković-Ognjanović, V. N.; Pastor, F. ; Mladenović, A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. Journal of Molecular Liquids 2024, 397, 124097. https://doi.org/10.1016/j.molliq.2024.124097. in Journal of Molecular Liquids
Elsevier B.V.., 397, 124097.
https://hdl.handle.net/21.15107/rcub_technorep_7332

Ivanović T, Popović DŽ, Miladinović J, Miladinović ZP, Rajaković-Ognjanović VN, Pastor F, Mladenović A. Supplementary material for the article: Ivanović, T.; Popović, D. Ž.; Miladinović, J.; Miladinović, Z. P.; Rajaković-Ognjanović, V. N.; Pastor, F. ; Mladenović, A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. Journal of Molecular Liquids 2024, 397, 124097. https://doi.org/10.1016/j.molliq.2024.124097. in Journal of Molecular Liquids. 2024;397:124097.
https://hdl.handle.net/21.15107/rcub_technorep_7332 .

Ivanović, Tijana, Popović, Daniela Ž., Miladinović, Jelena, Miladinović, Zoran P., Rajaković-Ognjanović, Vladana N., Pastor, Ferenc, Mladenović, Anja, "Supplementary material for the article: Ivanović, T.; Popović, D. Ž.; Miladinović, J.; Miladinović, Z. P.; Rajaković-Ognjanović, V. N.; Pastor, F. ; Mladenović, A. Advanced thermodynamic approach to adsorption of charged adsorbates from aqueous electrolyte solutions. Journal of Molecular Liquids 2024, 397, 124097. https://doi.org/10.1016/j.molliq.2024.124097" in Journal of Molecular Liquids, 397 (2024):124097,
https://hdl.handle.net/21.15107/rcub_technorep_7332 .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela Ž.
AU  - Miladinović, Jelena
AU  - Miladinović, Zoran P.
AU  - Pastor, Ferenc
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5863
AB  - Zero-current cell potential measurements were used to determine the solution activity coefficient in a ternary system {yKCl + (1 - y) KH2PO4}(aq) at temperature T = 298.15 K. The cell of the type K-ISE|KCl(mKCl), KH2PO4(mKH2PO4)|Ag|AgCl was used in the total ionic strength range, Im = 0.0886-1.0046 mol kg-1. In order to generate a set of parameters that can be applied in a wide range of mixed solution ionic strengths, the Pitzer, Scatchard, and Clegg-Pitzer-Brimblecombe models were used to fit all available experimental data, including cell potential and isopiestic measurements from the literature. The experimental and calculated values of thermodynamic properties for the studied system are in excellent agreement. Potential interactions and solution structure were discussed by means of the excess free energy of mixing via potential pairs, triplets, or quads for the investigated solution using the Scatchard model mixing parameters.
PB  - American Chemical Society
T2  - Journal of Chemical and Engineering Data
T1  - Activity Coefficients of the System { yKCl + (1 - y)KH2PO4}(aq) at T = 298.15 K Determined by Cell Potential Measurements
DO  - 10.1021/acs.jced.2c00704
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela Ž. and Miladinović, Jelena and Miladinović, Zoran P. and Pastor, Ferenc",
year = "2022",
abstract = "Zero-current cell potential measurements were used to determine the solution activity coefficient in a ternary system {yKCl + (1 - y) KH2PO4}(aq) at temperature T = 298.15 K. The cell of the type K-ISE|KCl(mKCl), KH2PO4(mKH2PO4)|Ag|AgCl was used in the total ionic strength range, Im = 0.0886-1.0046 mol kg-1. In order to generate a set of parameters that can be applied in a wide range of mixed solution ionic strengths, the Pitzer, Scatchard, and Clegg-Pitzer-Brimblecombe models were used to fit all available experimental data, including cell potential and isopiestic measurements from the literature. The experimental and calculated values of thermodynamic properties for the studied system are in excellent agreement. Potential interactions and solution structure were discussed by means of the excess free energy of mixing via potential pairs, triplets, or quads for the investigated solution using the Scatchard model mixing parameters.",
publisher = "American Chemical Society",
journal = "Journal of Chemical and Engineering Data",
title = "Activity Coefficients of the System { yKCl + (1 - y)KH2PO4}(aq) at T = 298.15 K Determined by Cell Potential Measurements",
doi = "10.1021/acs.jced.2c00704"
}

Ivanović, T., Popović, D. Ž., Miladinović, J., Miladinović, Z. P.,& Pastor, F.. (2022). Activity Coefficients of the System { yKCl + (1 - y)KH2PO4}(aq) at T = 298.15 K Determined by Cell Potential Measurements. in Journal of Chemical and Engineering Data
American Chemical Society..
https://doi.org/10.1021/acs.jced.2c00704

Ivanović T, Popović DŽ, Miladinović J, Miladinović ZP, Pastor F. Activity Coefficients of the System { yKCl + (1 - y)KH2PO4}(aq) at T = 298.15 K Determined by Cell Potential Measurements. in Journal of Chemical and Engineering Data. 2022;.
doi:10.1021/acs.jced.2c00704 .

Ivanović, Tijana, Popović, Daniela Ž., Miladinović, Jelena, Miladinović, Zoran P., Pastor, Ferenc, "Activity Coefficients of the System { yKCl + (1 - y)KH2PO4}(aq) at T = 298.15 K Determined by Cell Potential Measurements" in Journal of Chemical and Engineering Data (2022),
https://doi.org/10.1021/acs.jced.2c00704 . .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Pastor, Ferenc
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4346
AB  - Isopiestic measurements have been made at 55 compositions of the {yK(2)HPO(4) + (1 - y)KH2PO4}(aq) system at T = (298.15 +/- 0.01) K, 11 for each of the limiting binary solutions and 33 for mixture compositions at K2HPO4 stoichiometric ionic strength fractions y = (0.23330, 0.47671, and 0.73177), using KCl(aq) as the reference standard. Model parameters for the binary subsystems were evaluated at this temperature for an extended form of Pitzer's ion-interaction model and also for the Clegg, Pitzer and Brimblecombe model based on the mole-fraction-composition scale, using the present isopiestic results along with critically-assessed osmotic coefficients for both of these aqueous electrolytes as extracted from the published literature. The thermodynamic models for KH2PO4(aq) extend to slightly above the saturated solution molality at T = (298.15 +/- 0.01) K, whereas those for K2HPO4(aq) extend to m = 9.7429 mol.kg(-1), which is the molality of the saturated solution, also at T = (298.15 +/- 0.01) K. These results yield the CODATA-compatible standard Gibbs energy of formation Delta(f)G(m)(o)(K2HPO4 center dot 3H(2)O; cr; 298.15 K) = -(2367.70 +/- 1.60) kJ.mol(-1). The 33 osmotic coefficients for the ternary mixtures were likewise represented with these models, using both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms for the extended ion-interaction model. Two mixing parameters are needed for each of the three models for {yK(2)HPO(4) + (1 - y)KH2PO4}(aq), and both of these ion-interaction models give similar high-quality representations of the experimental results. However, the Clegg, Pitzer and Brimblecombe model had more difficulty in representing the osmotic coefficients of K2HPO4(aq), especially below 3 mol.kg(-1), and consequently the corresponding mixture model with two mixing parameters is slightly less accurate for representing the osmotic coefficients. The maximum difference in calculated values of the mean molality-based activity coefficients for the two recommended extended Pitzer models with the different types of mixing terms are 0.0061 for the trace activity coefficient of K2HPO4(aq) in KH2PO4(aq) but with much better agreement at most mixture compositions.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K
VL  - 142
DO  - 10.1016/j.jct.2019.105945
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Pastor, Ferenc",
year = "2020",
abstract = "Isopiestic measurements have been made at 55 compositions of the {yK(2)HPO(4) + (1 - y)KH2PO4}(aq) system at T = (298.15 +/- 0.01) K, 11 for each of the limiting binary solutions and 33 for mixture compositions at K2HPO4 stoichiometric ionic strength fractions y = (0.23330, 0.47671, and 0.73177), using KCl(aq) as the reference standard. Model parameters for the binary subsystems were evaluated at this temperature for an extended form of Pitzer's ion-interaction model and also for the Clegg, Pitzer and Brimblecombe model based on the mole-fraction-composition scale, using the present isopiestic results along with critically-assessed osmotic coefficients for both of these aqueous electrolytes as extracted from the published literature. The thermodynamic models for KH2PO4(aq) extend to slightly above the saturated solution molality at T = (298.15 +/- 0.01) K, whereas those for K2HPO4(aq) extend to m = 9.7429 mol.kg(-1), which is the molality of the saturated solution, also at T = (298.15 +/- 0.01) K. These results yield the CODATA-compatible standard Gibbs energy of formation Delta(f)G(m)(o)(K2HPO4 center dot 3H(2)O; cr; 298.15 K) = -(2367.70 +/- 1.60) kJ.mol(-1). The 33 osmotic coefficients for the ternary mixtures were likewise represented with these models, using both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms for the extended ion-interaction model. Two mixing parameters are needed for each of the three models for {yK(2)HPO(4) + (1 - y)KH2PO4}(aq), and both of these ion-interaction models give similar high-quality representations of the experimental results. However, the Clegg, Pitzer and Brimblecombe model had more difficulty in representing the osmotic coefficients of K2HPO4(aq), especially below 3 mol.kg(-1), and consequently the corresponding mixture model with two mixing parameters is slightly less accurate for representing the osmotic coefficients. The maximum difference in calculated values of the mean molality-based activity coefficients for the two recommended extended Pitzer models with the different types of mixing terms are 0.0061 for the trace activity coefficient of K2HPO4(aq) in KH2PO4(aq) but with much better agreement at most mixture compositions.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K",
volume = "142",
doi = "10.1016/j.jct.2019.105945"
}

Ivanović, T., Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Pastor, F.. (2020). Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 142.
https://doi.org/10.1016/j.jct.2019.105945

Ivanović T, Popović D, Miladinović J, Rard JA, Miladinović ZP, Pastor F. Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K. in Journal of Chemical Thermodynamics. 2020;142.
doi:10.1016/j.jct.2019.105945 .

Ivanović, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Pastor, Ferenc, "Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K" in Journal of Chemical Thermodynamics, 142 (2020),
https://doi.org/10.1016/j.jct.2019.105945 . .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Pastor, Ferenc
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4562
AB  - Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4and Na2HPO4at T = 298.15 ± 0.01 K, at NaH2PO4ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4as 1:1 and Na2HPO4as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol·kg-1, whereas those for Na2HPO4(aq) extend to m = 2.6050 mol·kg-1, which is well above the solubility limit for the thermodynamically stable phase Na2HPO4·12H2O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH2PO4+ (1 - y)Na2HPO4}(aq) mixtures was found in the literature [ Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183 ], and hence an analysis and comparison were made of our results with theirs.
PB  - Amer Chemical Soc, Washington
T2  - Journal of Chemical and Engineering Data
T1  - Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K
EP  - 5153
IS  - 11
SP  - 5137
VL  - 65
DO  - 10.1021/acs.jced.0c00281
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Pastor, Ferenc",
year = "2020",
abstract = "Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4and Na2HPO4at T = 298.15 ± 0.01 K, at NaH2PO4ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4as 1:1 and Na2HPO4as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol·kg-1, whereas those for Na2HPO4(aq) extend to m = 2.6050 mol·kg-1, which is well above the solubility limit for the thermodynamically stable phase Na2HPO4·12H2O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH2PO4+ (1 - y)Na2HPO4}(aq) mixtures was found in the literature [ Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183 ], and hence an analysis and comparison were made of our results with theirs.",
publisher = "Amer Chemical Soc, Washington",
journal = "Journal of Chemical and Engineering Data",
title = "Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K",
pages = "5153-5137",
number = "11",
volume = "65",
doi = "10.1021/acs.jced.0c00281"
}

Ivanović, T., Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Pastor, F.. (2020). Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K. in Journal of Chemical and Engineering Data
Amer Chemical Soc, Washington., 65(11), 5137-5153.
https://doi.org/10.1021/acs.jced.0c00281

Ivanović T, Popović D, Miladinović J, Rard JA, Miladinović ZP, Pastor F. Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K. in Journal of Chemical and Engineering Data. 2020;65(11):5137-5153.
doi:10.1021/acs.jced.0c00281 .

Ivanović, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Pastor, Ferenc, "Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K" in Journal of Chemical and Engineering Data, 65, no. 11 (2020):5137-5153,
https://doi.org/10.1021/acs.jced.0c00281 . .