Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions
Here, we report a new version of the extended Rate Constants Distribution (RCD) model for metal ion sorption, which includes complex-formation equilibria. With the RCD-complex model, one can predict sorbent performance in the presence of complexing agents using data on metal ion sorption from ligand...
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MDPI AG
2023-08-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/24/15/12385 |
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| author | Alexey Golikov Yuliya Privar Denis Balatskiy Natalia Polyakova Svetlana Bratskaya |
| author_facet | Alexey Golikov Yuliya Privar Denis Balatskiy Natalia Polyakova Svetlana Bratskaya |
| author_sort | Alexey Golikov |
| collection | DOAJ |
| description | Here, we report a new version of the extended Rate Constants Distribution (RCD) model for metal ion sorption, which includes complex-formation equilibria. With the RCD-complex model, one can predict sorbent performance in the presence of complexing agents using data on metal ion sorption from ligand-free solutions and a set of coefficients for sorption rate constants of different ionic species. The RCD-complex model was applied to breakthrough curves of Cu(II) sorption from acetate and tartrate solutions on polyethyleneimine (PEI) monolith cryogel at different flow rates and ionic speciation. We have shown that, despite the lower stability of Cu(II)-acetate complex, at high flow rates, acetate has a more pronounced negative effect on sorption kinetics than tartrate. The RCD model was successfully used to predict the shape of the breakthrough curves at an arbitrary acetate concentration but failed to predict Cu(II) sorption from tartrate solutions in a broad range of ligand concentrations. Since a twofold increase in sorption capacity was observed at low tartrate concentrations, the latter fact was related to an alteration in the sorption mechanism of Cu(II)-ions, which depended on Cu(II) ionic speciation. The obtained results emphasize the importance of information about sorption kinetics of different ionic forms for the optimization of sorption filter performance in the presence of complexing agents. |
| first_indexed | 2024-03-11T00:25:55Z |
| format | Article |
| id | doaj.art-f0f0339aade04ce9a267ad50c546d9fe |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-11T00:25:55Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
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| series | International Journal of Molecular Sciences |
| spelling | doaj.art-f0f0339aade04ce9a267ad50c546d9fe2023-11-18T23:04:19ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672023-08-0124151238510.3390/ijms241512385Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate SolutionsAlexey Golikov0Yuliya Privar1Denis Balatskiy2Natalia Polyakova3Svetlana Bratskaya4Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prospect 100-Letiya Vladivostoka, 690022 Vladivostok, RussiaInstitute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prospect 100-Letiya Vladivostoka, 690022 Vladivostok, RussiaInstitute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prospect 100-Letiya Vladivostoka, 690022 Vladivostok, RussiaInstitute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prospect 100-Letiya Vladivostoka, 690022 Vladivostok, RussiaInstitute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences, 159, Prospect 100-Letiya Vladivostoka, 690022 Vladivostok, RussiaHere, we report a new version of the extended Rate Constants Distribution (RCD) model for metal ion sorption, which includes complex-formation equilibria. With the RCD-complex model, one can predict sorbent performance in the presence of complexing agents using data on metal ion sorption from ligand-free solutions and a set of coefficients for sorption rate constants of different ionic species. The RCD-complex model was applied to breakthrough curves of Cu(II) sorption from acetate and tartrate solutions on polyethyleneimine (PEI) monolith cryogel at different flow rates and ionic speciation. We have shown that, despite the lower stability of Cu(II)-acetate complex, at high flow rates, acetate has a more pronounced negative effect on sorption kinetics than tartrate. The RCD model was successfully used to predict the shape of the breakthrough curves at an arbitrary acetate concentration but failed to predict Cu(II) sorption from tartrate solutions in a broad range of ligand concentrations. Since a twofold increase in sorption capacity was observed at low tartrate concentrations, the latter fact was related to an alteration in the sorption mechanism of Cu(II)-ions, which depended on Cu(II) ionic speciation. The obtained results emphasize the importance of information about sorption kinetics of different ionic forms for the optimization of sorption filter performance in the presence of complexing agents.https://www.mdpi.com/1422-0067/24/15/12385polyethyleneimineporous materialcryogelsorption kineticssorption mechanismFTIR spectroscopy |
| spellingShingle | Alexey Golikov Yuliya Privar Denis Balatskiy Natalia Polyakova Svetlana Bratskaya Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions International Journal of Molecular Sciences polyethyleneimine porous material cryogel sorption kinetics sorption mechanism FTIR spectroscopy |
| title | Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions |
| title_full | Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions |
| title_fullStr | Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions |
| title_full_unstemmed | Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions |
| title_short | Extended Rate Constants Distribution (RCD) Model for Sorption in Heterogeneous Systems: 4. Kinetics of Metal Ions Sorption in the Presence of Complexing Agents—Application to Cu(II) Sorption on Polyethyleneimine Cryogel from Acetate and Tartrate Solutions |
| title_sort | extended rate constants distribution rcd model for sorption in heterogeneous systems 4 kinetics of metal ions sorption in the presence of complexing agents application to cu ii sorption on polyethyleneimine cryogel from acetate and tartrate solutions |
| topic | polyethyleneimine porous material cryogel sorption kinetics sorption mechanism FTIR spectroscopy |
| url | https://www.mdpi.com/1422-0067/24/15/12385 |
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