Effect of Crosslinker Type and Embedded Magnetite on the Uptake Behavior of Amine Containing Glycidyl Methacrylate Resins towards Iron(III)

Abstract

Copolymerization of glycidyl methacrylate (GMA) in the presence of divinylbenzene (DVB) or N,N′‐methylene bis‐acrylamide (MBA) as hydrophobic or hydrophilic crosslinker was carried out. The obtained resins were immobilized with tetraethylenepentamine as active moieties. The (MBA) containing resin showed higher uptake capacity (9.0 mmol/g) towards Fe(III) compared to (DVB) containing one (8.1 mmol/g). Moreover, magnetization of (GMA/MBA) resin by embedded Fe₃O₄ dramatically improved its uptake towards Fe(III) to reach 13.0 mmol/g at 28°C. Kinetic studies indicated that the adsorption of Fe(III) by the investigated resins follows the pseudo second order kinetics. The higher efficiency of the magnetic resin towards uptake of Fe(III) was also confirmed through column studies. Regeneration of the resins was achieved using acidified thiourea with HNO₃. The durability of the resins was checked up to 5 cycles with no appreciable change in uptake capacity or durability.

Keywords:

• Iron
• resins
• glycidyl methacrylate
• adsorption
• kinetics
• thermodynamics