ADSORPTION OF Ni(II) IONS FROM AQUEOUS SOLUTIONS ONTO MAGNETIC POLY( DIVINYLBENZENE-CO-VINYLIMIDAZOLE) MICROBEADS: PHYSICOCHEMICAL STUDIES

• Main Authors: Ali KARA, Emel DEMİRBEL
• Format: Article
• Language: English
• Published: Anadolu University 2012-06-01
• Series: Anadolu University Journal of Science and Technology. A : Applied Sciences and Engineering
• Subjects: Magnetic polymers; Adsorption isotherm; Adsorption kinetic; Adsorption thermodynamic
• Online Access: http://btd.anadolu.edu.tr/index.php/BTDA/article/viewFile/195/97
• ISSN: 1302-3160; 2146-0205

A modified suspension polymerization was used for the preparation of the mesoporous magnetic-poly(divinylbenzene-co-vinylimidazole) (m-poly(DVB-VIM)) microbeads in size 53-212 μm of average diameter. The specific surface area and the DVB/VIM mol ratio of the microsphereswere determined as 29.47 m2/g and 1:4 mol/mol with Fe3O4, respectively. The physicochemical studies of adsorption of Ni(II) ions from aqueous solutions such as pH, initial concentration, amountof mesoporous m-poly(DVB-VIM) microbeads, contact time, and temperature onto the m-poly(DVBVIM) microspheres were carried out. The maximum adsorption capacities of the m-poly(DVB-VIM)microspheres towards Ni(II) ions were determined as 13.51, 20.14, 21.00 and 23.62 mg/g at 277 K, 298 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 and the Langmuir isotherm models, respectively. Various thermodynamic parameters, such as the Gibbs’ free energy change (ΔGo), the standard enthalpy change (ΔHo) and the standard entropy change (ΔSo) were also determined. Morever, after use in the adsorption, the m-poly(DVB-VIM) microbeads with paramagnetic property was separated from the via the applied magnetic force. These results indicate that the material studied could be used as a purifier for the removal of Ni(II) ions from water and wastewater under magnetic field.