Adsorption properties of magnetic chitosan nanoparticle for humic acid and heavy metal ions

The adsorption property of magnetic chitosan nanoparticle for humic acid and metal ions were studied.The adsorption performance of the absorbent on metal ions(Cu2+,Pb2+ and Cd2+) were affected by the presence of humic acid.The experimental results show that the highest adsorption capacity of 292 mg/g for humic acid is obtained at pH=11.The adsorption equilibrium was arrived in 15 min.The adsorption capacity for humic acid remained 60% of the initial adsorption capacity after being used five times.Furthermore,the Fe3O4-chitosan particles could be used to absorb metal ions after adsorption of humic acid.Compared with the results of metal ions alone adsorption,the adsorption capacities for Cu2+ and Pb2+ were decreased while the adsorption capacity for Cd2+ was greatly increased after adsorption of humic acid.