Synthesis of amidoximated Tragacanth gum and its application for adsorption of heavy metal ions from aqueous solutions

A new nanohydrogel was prepared by grafting polyacrylonitrile onto Tragacanth gum, a naturally and abundantly available polysaccharide, and subsequent amidoximation in the presence of hydroxylamine hydrochloride. Theadsorption behavior for the removal of some heavy metal ions was investigated by various isotherm and kineticequations, and the results were fitted well with the Temkin isotherm and pseudo-second-order model. The maximumadsorption capacities (Qm) of nanohydrogel as obtained from Langmuir adsorption isotherm was found to be 100.0, 76.92, 71.42 and 66.67 (mg g-1) for the adsorption of metal in order of Co(II)> Zn(II)> Cr(III)> Cd(II).

کلیدواژه ها:

Tragacanth gum ، Amidoximation ، Metal ion ، Nanohydrogel ، Isotherm ، Kinetic