摘要

An easy and efficient homogeneous adsorption of chitosan for metal ions in a single and binary metal ion systems was investigated. The chitosan solution was firstly mixed into the metal ion solution to quickly chelate metal ions. Then chitosan-metal ion nanoparticles were formed when sodium phytate was added into mixed solution and finally separated by centrifugation. The homogeneous adsorption properties of chitosan for Cu(II) and Ni(II) ions under different adsorption conditions were investigated in detail. The adsorption of Cu(II) and Ni(II) followed the Langmuir model and the pseudo-second order kinetic model. The maximum adsorption capacities for Cu(II) and Ni(II) ions, were 405 and 315 mg/g, respectively, initial concentration 1000 mg/L of Cu(II) or Ni(II) ions, pH 5.2, and temperature 30 degrees C. These values were five and eight times as much as pure chitosan resin reported, showing a high performance/price ratio although no regeneration. Phosphorus atoms were not determined in the liquid supernatant by ICP though addition of sodium phytate, suggesting no secondary pollution occurred after addition of sodium phytate. These results demonstrated that the homogeneous adsorption of chitosan solution for metal ions was a promising clear production process.