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Keywords:

  • starch;
  • acrylic acid;
  • basic dye;
  • Safranine T;
  • Freundlich isotherm

Abstract

Graft copolymerization of acrylic acid (AA) onto starch was carried out with ceric ammonium nitrate as initiator under nitrogen atmosphere. The grafting percentages (GP%) of starch-graft-AA (St-gr-AA) copolymers were determined. When the AA molar concentrations were 0.3 and 0.5 mol/L, GP% of St-gr-AA copolymers were 10.5% (St-gr-AA-1) and 14% (St-gr-AA-2), respectively. St-gr-AA copolymers have been used for the adsorption of basic dye (Safranine T) from aqueous solutions. Effects of various parameters such as treatment time, initial pH of the solution (pH = 2–6), initial dye concentration (50– 500 mg/L), and GP% of starch graft copolymers were investigated.Basic dye removal capacities of the copolymers increase along with the augment of initial concentration of the adsorbate, GP% of the copolymers, and pH. The adsorption capacities for St-gr-AA-1 and St-gr-AA-2 reach 116.5 and 204 mg/g, respectively. Equilibrium adsorption data were obtained and fitted very well to Freundlich model. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007