Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups
A modified two-step seeded polymerization was used for the preparation of porous mono-sized microspheres of poly(ethylene glycol dimethacrylate- co -1-vinylimidazole) [poly(EGDMA- co -VIM)] of 7 μm in size. The specific surface area and the EGDMA/VIM molar ratio of the microspheres were determined a...
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SAGE Publishing
2011-03-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.29.3.259 |
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| author | Ali Kara Ali Tuncel |
| author_facet | Ali Kara Ali Tuncel |
| author_sort | Ali Kara |
| collection | DOAJ |
| description | A modified two-step seeded polymerization was used for the preparation of porous mono-sized microspheres of poly(ethylene glycol dimethacrylate- co -1-vinylimidazole) [poly(EGDMA- co -VIM)] of 7 μm in size. The specific surface area and the EGDMA/VIM molar ratio of the microspheres were determined as 64.5 m 2 /g and 1.5:1.0 mol/mol, respectively. The adsorption of Pb(II) ions from aqueous solution onto the porous mono-sized poly(EGDMA- co- VIM) microspheres was examined. The maximum adsorption capacities of the microspheres towards Pb(II) ions were determined as 21.74, 30.52, 49.23 and 56.48 mg/g at 293 K, 303 K, 318 K and 338 K, respectively. The dynamic and equilibrium adsorption behaviours of the system were adequately described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The apparent activation energy was determined as 6.212 kJ/mol, which is characteristic of a chemically controlled reaction. The values of E fe obtained from the Dubinin–Radushkevich equation in the non-linear form were 9.153 kJ/mol at 293 K, 10.34 kJ/mol at 303 K, 10.18 kJ/mol at 318 K and 10.91 kJ/mol at 333 K, thereby indicating that the adsorption of Pb(II) ions onto the porous monosized poly(EGDMA- co -VIM) microspheres occurred via a chemical process at all the temperatures studied. Various thermodynamic parameters, such as the Gibbs' free energy change (ΔG 0 ), the standard enthalpy change (ΔH 0 ) and the standard entropy change (ΔS 0 ) were also determined. The thermodynamic parameters obtained indicated that the adsorption process was endothermic in nature. These results demonstrate that the material studied could be used as a purifier for the removal of Pb(II) ions from water and wastewater. |
| format | Article |
| id | doaj-art-125aea5ed1ee4d3bb943bfd96aec2de0 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2011-03-01 |
| publisher | SAGE Publishing |
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| series | Adsorption Science & Technology |
| spelling | doaj-art-125aea5ed1ee4d3bb943bfd96aec2de02025-01-02T23:44:15ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382011-03-012910.1260/0263-6174.29.3.259Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional GroupsAli Kara0Ali Tuncel1 Department of Chemistry, Uludağ University, Bursa, Turkey Chemical Engineering Department, Hacettepe University, Ankara, TurkeyA modified two-step seeded polymerization was used for the preparation of porous mono-sized microspheres of poly(ethylene glycol dimethacrylate- co -1-vinylimidazole) [poly(EGDMA- co -VIM)] of 7 μm in size. The specific surface area and the EGDMA/VIM molar ratio of the microspheres were determined as 64.5 m 2 /g and 1.5:1.0 mol/mol, respectively. The adsorption of Pb(II) ions from aqueous solution onto the porous mono-sized poly(EGDMA- co- VIM) microspheres was examined. The maximum adsorption capacities of the microspheres towards Pb(II) ions were determined as 21.74, 30.52, 49.23 and 56.48 mg/g at 293 K, 303 K, 318 K and 338 K, respectively. The dynamic and equilibrium adsorption behaviours of the system were adequately described by the pseudo-second-order kinetic model and the Langmuir isotherm, respectively. The apparent activation energy was determined as 6.212 kJ/mol, which is characteristic of a chemically controlled reaction. The values of E fe obtained from the Dubinin–Radushkevich equation in the non-linear form were 9.153 kJ/mol at 293 K, 10.34 kJ/mol at 303 K, 10.18 kJ/mol at 318 K and 10.91 kJ/mol at 333 K, thereby indicating that the adsorption of Pb(II) ions onto the porous monosized poly(EGDMA- co -VIM) microspheres occurred via a chemical process at all the temperatures studied. Various thermodynamic parameters, such as the Gibbs' free energy change (ΔG 0 ), the standard enthalpy change (ΔH 0 ) and the standard entropy change (ΔS 0 ) were also determined. The thermodynamic parameters obtained indicated that the adsorption process was endothermic in nature. These results demonstrate that the material studied could be used as a purifier for the removal of Pb(II) ions from water and wastewater.https://doi.org/10.1260/0263-6174.29.3.259 |
| spellingShingle | Ali Kara Ali Tuncel Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups Adsorption Science & Technology |
| title | Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups |
| title_full | Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups |
| title_fullStr | Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups |
| title_full_unstemmed | Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups |
| title_short | Kinetics, Isotherms and Thermodynamics of the Adsorption of Lead(II) Ions onto Porous Mono-Sized Microspheres Possessing Imidazole Functional Groups |
| title_sort | kinetics isotherms and thermodynamics of the adsorption of lead ii ions onto porous mono sized microspheres possessing imidazole functional groups |
| url | https://doi.org/10.1260/0263-6174.29.3.259 |
| work_keys_str_mv | AT alikara kineticsisothermsandthermodynamicsoftheadsorptionofleadiiionsontoporousmonosizedmicrospherespossessingimidazolefunctionalgroups AT alituncel kineticsisothermsandthermodynamicsoftheadsorptionofleadiiionsontoporousmonosizedmicrospherespossessingimidazolefunctionalgroups |