A novel removal of Ni2+ ions from water solutions using dispersive solid-phase extraction method with nano Fe3O4/chitosan-acrylamide hydrogel

Abstract

Abstract The effluent release containing heavy metals as Ni2+ ions has drastic risks to both the natural environment and human health. In this research, the nano Fe3O4/chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni2+ ions and applyed in for the water sample solution. The pH, amount and type of elution solvent, the extraction time and etc were optimized for the improving the efficiency of proposed method. Analytical parameters such as concentration factor, the limit of detection and relative standard deviation (%) were achieved as 33.3, 1.25 µg L− 1 and 1.8%, respectively. The capacity in equilibrium sorption was calculated 22.54 mg g− 1. Furthermore, to estimate adsorption mode, the model of Freundlich and Langmuir was fitted to empirical isotherm data. Besides, to check the basic process of the metal adsorption mechanism pseudo-first-order and pseudo-second-order and Roginsky-Zeldovich model were investigated and the resuls were fitted with the pseudo-second-order model. Finally, the nano Fe3O4/chitosan-acrylamide hydrogel exhibited high performance to removal the Ni2+ ions from water sample solution.