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Keywords:

  • N-vinyl-2-pyrrolidone;
  • Itaconic acid;
  • heavy metal ion;
  • water absorption;
  • adsorption;
  • kinetic study

Abstract

In this study, a series of crosslinked N-vinyl-2-pyrrolidone–itaconic acid (NVP-IA) hydrogels was prepared by free radical polymerisation in aqueous solution. Swelling, mechanical and adsorption properties for the removal of Cu2+ and Pb2+ ions from aqueous solutions of these hydrogels were investigated. Metal ion adsorption capacities of hydrogels for Cu2+ and Pb2+ ions were determined as 2.1 and 0.6 mmol g −1, respectively. Adsorption processes of metal ions onto the NVP-IA hydrogels follow pseudo-second-order type adsorption kinetics. The equilibrium adsorption data have been evaluated using Freundlich and Langmuir isotherm models. The results illustrated that the adsorption follows Freundlich isotherm.