Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests
The characteristics of arsenic adsorption onto Fe-XAD8-DEHPA resin were studied on the laboratory scale using aqueous solutions and natural underground waters. Amberlite XAD8 resin was impregnated with di(2-ethylhexyl) phosphoric acid (DEHPA) via the dry method of impregnation. Fe(III) ions were loa...
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| Format: | Article |
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MDPI AG
2014-10-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/19/10/16082 |
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| author | Mihaela Ciopec Adina Negrea Lavinia Lupa Corneliu M. Davidescu Petru Negrea |
| author_facet | Mihaela Ciopec Adina Negrea Lavinia Lupa Corneliu M. Davidescu Petru Negrea |
| author_sort | Mihaela Ciopec |
| collection | DOAJ |
| description | The characteristics of arsenic adsorption onto Fe-XAD8-DEHPA resin were studied on the laboratory scale using aqueous solutions and natural underground waters. Amberlite XAD8 resin was impregnated with di(2-ethylhexyl) phosphoric acid (DEHPA) via the dry method of impregnation. Fe(III) ions were loaded onto the impregnated resin by exploiting the high affinity of arsenic towards iron. The studies were conducted by both in contact and continuous modes. Kinetics data revealed that the removal of arsenic by Fe-XAD8-DEHPA resin is a pseudo-second-order reaction. The equilibrium data were modelled with Freundlich Langmuir and Dubinin Radushkevich (D-R) isotherms and it was found that the Freundlich model give the poorest correlation coefficient. The maximum adsorption capacity obtained from the Langmuir isotherm is 22.6 µg As(V)/g of Fe-XAD8-DEHPA resin. The mean free energy of adsorption was found in this study to be 7.2 kJ/mol and the ΔG° value negative (−9.2 kJ/mol). This indicates that the sorption process is exothermal, spontaneous and physical in nature. The studied Fe-XAD8-DEHPA resin showed excellent arsenic removal performance by sorption, both from synthetic solution and the natural water sample, and could be regenerated simply by using aqueous NaOH or HCl solutions. |
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| id | doaj.art-5c9712132b7a4e3f93fd9242a52a5abb |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-12-14T12:17:24Z |
| publishDate | 2014-10-01 |
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| series | Molecules |
| spelling | doaj.art-5c9712132b7a4e3f93fd9242a52a5abb2022-12-21T23:01:35ZengMDPI AGMolecules1420-30492014-10-011910160821610110.3390/molecules191016082molecules191016082Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column TestsMihaela Ciopec0Adina Negrea1Lavinia Lupa2Corneliu M. Davidescu3Petru Negrea4Faculty of Industrial Chemistry and Environmental Engineering Blvd., "Politehnica" University of Timisoara, Vasile Parvan No. 6, Timisoara 300223, RomaniaFaculty of Industrial Chemistry and Environmental Engineering Blvd., "Politehnica" University of Timisoara, Vasile Parvan No. 6, Timisoara 300223, RomaniaFaculty of Industrial Chemistry and Environmental Engineering Blvd., "Politehnica" University of Timisoara, Vasile Parvan No. 6, Timisoara 300223, RomaniaFaculty of Industrial Chemistry and Environmental Engineering Blvd., "Politehnica" University of Timisoara, Vasile Parvan No. 6, Timisoara 300223, RomaniaFaculty of Industrial Chemistry and Environmental Engineering Blvd., "Politehnica" University of Timisoara, Vasile Parvan No. 6, Timisoara 300223, RomaniaThe characteristics of arsenic adsorption onto Fe-XAD8-DEHPA resin were studied on the laboratory scale using aqueous solutions and natural underground waters. Amberlite XAD8 resin was impregnated with di(2-ethylhexyl) phosphoric acid (DEHPA) via the dry method of impregnation. Fe(III) ions were loaded onto the impregnated resin by exploiting the high affinity of arsenic towards iron. The studies were conducted by both in contact and continuous modes. Kinetics data revealed that the removal of arsenic by Fe-XAD8-DEHPA resin is a pseudo-second-order reaction. The equilibrium data were modelled with Freundlich Langmuir and Dubinin Radushkevich (D-R) isotherms and it was found that the Freundlich model give the poorest correlation coefficient. The maximum adsorption capacity obtained from the Langmuir isotherm is 22.6 µg As(V)/g of Fe-XAD8-DEHPA resin. The mean free energy of adsorption was found in this study to be 7.2 kJ/mol and the ΔG° value negative (−9.2 kJ/mol). This indicates that the sorption process is exothermal, spontaneous and physical in nature. The studied Fe-XAD8-DEHPA resin showed excellent arsenic removal performance by sorption, both from synthetic solution and the natural water sample, and could be regenerated simply by using aqueous NaOH or HCl solutions.http://www.mdpi.com/1420-3049/19/10/16082arsenic removalFe-XAD8-DEHPAunderground wateradsorption isothermkineticscolumn study |
| spellingShingle | Mihaela Ciopec Adina Negrea Lavinia Lupa Corneliu M. Davidescu Petru Negrea Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests Molecules arsenic removal Fe-XAD8-DEHPA underground water adsorption isotherm kinetics column study |
| title | Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests |
| title_full | Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests |
| title_fullStr | Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests |
| title_full_unstemmed | Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests |
| title_short | Studies Regarding As(V) Adsorption from Underground Water by Fe-XAD8-DEHPA Impregnated Resin. Equilibrium Sorption and Fixed-Bed Column Tests |
| title_sort | studies regarding as v adsorption from underground water by fe xad8 dehpa impregnated resin equilibrium sorption and fixed bed column tests |
| topic | arsenic removal Fe-XAD8-DEHPA underground water adsorption isotherm kinetics column study |
| url | http://www.mdpi.com/1420-3049/19/10/16082 |
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