Facile Preparation of Ion-Imprinted Chitosan Microspheres Enwrapping Fe3O4 and Graphene Oxide by Inverse Suspension Cross-Linking for Highly Selective Removal of Copper(II)

Abstract

A novel magnetic copper imprinted chitosan/graphene oxide composite biomaterial was prepared by the combination of ion imprinting and inverse suspension cross-linking for selective adsorption of Cu(II) from aqueous solution. High adsorption capacity for copper was obtained with a low level cross-linking and the addition of graphene oxide and triglycine in the preparing process. The prepared ion-imprinted magnetic chitosan polymer microsphere (CS-IIP) was characterized by FT-IR, TGA, SEM, and EDX. The results indicated that the CS-IIP was prepared successfully and showed good thermostability. Effects of different experimental conditions like pH value, contact time, and Cu(II) concentration on the adsorption capacity were investigated. The adsorption process follows the Freundlich isotherm equation and the pseudo-second-order kinetic model. The highest adsorption capacity of CS-IIP was 132 mg g–1. The calculation of selective factors and relative selectivity factors of CS-IIP for Cu2+/M2+ (M = Zn, Ni, Co, o...