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Kinetics, isotherms and thermodynamics of the adsorption of lead(II) ions onto porous mono-sized microspheres possessing imidazole functional groups

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Kara, Ali

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Tuncel, Ali

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Sage Publications

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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 mu m 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 mono-sized 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 (Delta G(0)), the standard enthalpy change (Delta H-0) and the standard entropy change (Delta S-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.

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Chemistry, Engineering, Heavy-metal ions, Aqueous-solution, Pb(II) ions, Copper(II) ions, Removal, Equilibrium, Water, Beads, Cadmium(II), Microbeads, Activation energy, Adsorption, Dyes, Ethylene, Ethylene glycol, Functional groups, Functional polymers, Lons, Isotherms, Lead, Mathematical models, Microspheres, Wastewater, Adsorption capacities, Adsorption of pb, Adsorption process, Apparent activation energy, Chemical process, Controlled reactions, Dubinin-Radushkevich equations, Equilibrium adsorption, Free energy change, Langmuir isotherm, Lead ions, Molar ratio, Mono-sized, Pseudo-second-order kinetic models, Seeded polymerization, Standard enthalpy, Standard entropy, Thermodynamic parameter, Vinylimidazole, Water and wastewater, Lead removal (water treatment)

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Kara, A. vd. (2011). "Kinetics, isotherms and thermodynamics of the adsorption of lead(II) ions onto porous mono-sized microspheres possessing imidazole functional groups". Adsorption Science and Technology, 29(3), 259-275.

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