Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites
The sorption equilibriums of phosphate and thiocyanate anions on isomorphic substituted Mg/Zn–Al-type hydrotalcites were investigated in this study. Langmuir and Freundlich isotherms were used to interpret the equilibrium data for phosphate. The sorption equilibriums of phosphate on Mg3Al, Mg2ZnAl a...
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| Language: | English |
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Serbian Chemical Society
2008-08-01
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| Series: | Journal of the Serbian Chemical Society |
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| Online Access: | http://www.shd.org.yu/JSCS/Vol73/No8-9/JSCS-3766.pdf |
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| author | RODICA PODE EVELINE POPOVICI LAURA COCHECI ERIKA REISZ ELENA MIHAELA SEFTEL VASILE PODE |
| author_facet | RODICA PODE EVELINE POPOVICI LAURA COCHECI ERIKA REISZ ELENA MIHAELA SEFTEL VASILE PODE |
| author_sort | RODICA PODE |
| collection | DOAJ |
| description | The sorption equilibriums of phosphate and thiocyanate anions on isomorphic substituted Mg/Zn–Al-type hydrotalcites were investigated in this study. Langmuir and Freundlich isotherms were used to interpret the equilibrium data for phosphate. The sorption equilibriums of phosphate on Mg3Al, Mg2ZnAl and Mg1.5Zn1.5Al hydrotalcites were well described by the Langmuir isotherm. The highest maximum sorption capacities for these adsorbents were as follows: 111, 101 and 95 mg g-1. The equilibrium constant and standard Gibbs energy changes were also calculated from the sorption data. Standard Gibbs energy changes of about –20 kJ mol-1 indicated that the process might be considered as physical adsorption. The sorption equilibriums of phosphate on isomorphic substituted samples of MgZn2Al and Zn3Al were well described by the Freundlich isotherm. Thiocyanate showed a relative low affinity for the studied materials, as indicated by both the “S”-shaped isotherms and low sorption capacities. The sorption of phosphate and thiocyanate on the investigated hydrotalcites showed a continuous decrease of the sorption capacity in the following order: Mg3Al > Mg2ZnAl > Mg1.5Zn1.5Al > MgZn2Al > Zn3Al. |
| first_indexed | 2024-04-12T14:29:54Z |
| format | Article |
| id | doaj.art-99eecadfd8114a56853bf1a0bfbc7b4e |
| institution | Directory Open Access Journal |
| issn | 0352-5139 |
| language | English |
| last_indexed | 2024-04-12T14:29:54Z |
| publishDate | 2008-08-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-99eecadfd8114a56853bf1a0bfbc7b4e2022-12-22T03:29:20ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51392008-08-01738-9835843Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcitesRODICA PODEEVELINE POPOVICILAURA COCHECIERIKA REISZELENA MIHAELA SEFTELVASILE PODEThe sorption equilibriums of phosphate and thiocyanate anions on isomorphic substituted Mg/Zn–Al-type hydrotalcites were investigated in this study. Langmuir and Freundlich isotherms were used to interpret the equilibrium data for phosphate. The sorption equilibriums of phosphate on Mg3Al, Mg2ZnAl and Mg1.5Zn1.5Al hydrotalcites were well described by the Langmuir isotherm. The highest maximum sorption capacities for these adsorbents were as follows: 111, 101 and 95 mg g-1. The equilibrium constant and standard Gibbs energy changes were also calculated from the sorption data. Standard Gibbs energy changes of about –20 kJ mol-1 indicated that the process might be considered as physical adsorption. The sorption equilibriums of phosphate on isomorphic substituted samples of MgZn2Al and Zn3Al were well described by the Freundlich isotherm. Thiocyanate showed a relative low affinity for the studied materials, as indicated by both the “S”-shaped isotherms and low sorption capacities. The sorption of phosphate and thiocyanate on the investigated hydrotalcites showed a continuous decrease of the sorption capacity in the following order: Mg3Al > Mg2ZnAl > Mg1.5Zn1.5Al > MgZn2Al > Zn3Al.http://www.shd.org.yu/JSCS/Vol73/No8-9/JSCS-3766.pdfMg/Zn–Al-type hydrotalcitessorptionequilibriumphosphatethiocyanate |
| spellingShingle | RODICA PODE EVELINE POPOVICI LAURA COCHECI ERIKA REISZ ELENA MIHAELA SEFTEL VASILE PODE Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites Journal of the Serbian Chemical Society Mg/Zn–Al-type hydrotalcites sorption equilibrium phosphate thiocyanate |
| title | Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites |
| title_full | Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites |
| title_fullStr | Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites |
| title_full_unstemmed | Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites |
| title_short | Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn–Al-type hydrotalcites |
| title_sort | sorption of phosphates and thiocyanates on isomorphic substituted mg zn al type hydrotalcites |
| topic | Mg/Zn–Al-type hydrotalcites sorption equilibrium phosphate thiocyanate |
| url | http://www.shd.org.yu/JSCS/Vol73/No8-9/JSCS-3766.pdf |
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