Abstract
Acrylic acid was grafted onto cellulose by graft copolymerization in [AMIM]Cl ionic liquids. Then, microspheres were prepared by an inverse suspension polymerization technique. The cellulose-graft-poly (acrylic acid) was confirmed by FTIR spectrum, thermo gravimetric analyzer, and a transmission electron microscope. The optimal conditions of synthesis was selected from orthogonal tests, the results of which show that the optimum reaction conditions were as follows: amount of monomer, 4 g/g cellulose (CE); dosage of initiator, 0.15 g/g CE; dosage of crosslinker, 0.05 g/g CE; reaction temperature, 60°C; and reaction time, 1.5 h. The adsorption behavior of the polymer microspheres for Cu2+ and Mn2+ ions was investigated showing that its adsorption capacity increased as initial concentration of metal ions, and contacting time increased. When pH value of solution was 5, it reached maximum adsorption amount as 201 and 175 mg/g for Cu2+ and Mn2+ ions, respectively.
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