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Başlık: Kinetics, isotherms and thermodynamics of the adsorption of lead(II) ions onto porous mono-sized microspheres possessing imidazole functional groups
Yazarlar: Tuncel, Ali
Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Anabilim Dalı.
Kara, Ali
AAG-6271-2019
7102824859
Anahtar kelimeler: 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)
Yayın Tarihi: Mar-2011
Yayıncı: Sage Publications
Atıf: 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.
Özet: 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.
URI: https://doi.org/10.1260/0263-6174.29.3.259
https://journals.sagepub.com/doi/abs/10.1260/0263-6174.29.3.259
http://hdl.handle.net/11452/23948
ISSN: 0263-6174
2048-4038
Koleksiyonlarda Görünür:Scopus
Web of Science

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