Efficient Adsorption of Heavy Metal Ions by A Novel AO‐PAN‐g‐Chitosan/Fe₃O₄ Composite

Abstract

In this study, a novel amidoxime‐based magnetic adsorbent (AO‐PAN‐g‐Chitosan/Fe3O4) was prepared by grafting acrylonitrile onto the surface of chitosan (CS) and magnetic Fe3O4 composite, followed by amidoximation. The magnetic adsorbents were characterized by infrared spectroscopy (FT‐IR) and X‐ray diffraction (XRD). The adsorption properties of the magnetic adsorbents for heavy metal ions in aqueous solutions were investigated under different conditions, including pH, contact time, and initial concentration of heavy metal ions. Under optimum conditions, the maximum Cu(II) and Ni(II) ion adsorption efficiencies were determined to be 38.39 mg/g and 32.68 mg/g by AO‐PAN‐g‐Chitosan/Fe3O4, respectively. Significantly, the Fe3O4/AO‐PAN‐g‐CS can be reproduced in a simple way and reused after five adsorption‐desorption cycles without any significant loss in the adsorption capacity.

Modified magnetic chitosan materials for heavy metal adsorption: a review

“…Li et al prepared a new type of amidoxime-based magnetic adsorbent. 150 Under the optimal conditions, the maximum adsorption efficiency for Ni( ii ) ions is 32.68 mg g −1 . Dong et al synthesized magnetic phosphorylated chitosan composite (P-MCS).…”

Heavy Metal Ion Adsorbent in Aqueous Solution: A Review on Chitosan and Chitosan Composites

“…It has been observed that a material exhibits remarkable reproducibility and reusability, as evidenced by its ability to undergo five adsorption-desorption cycles without experiencing any notable decline in its adsorption capacity for Cu(II) and Ni(II) ions [146]. Another study reported that Fe3O4-graphene oxide-chitosan removes 96.73 % of Zn(II) in 38 min, with adsorption quantity 386.92 mg•g −1 [147].…”

Preparation and Application of Magnetic Composites Using Controllable Assembly for Use in Water Treatment: A Review

“…Chitosan is a typical representative of biopolymers, which is derived from chitin and is a representative example of biopolymers [75]. Due to its strong biocompatibility, biodegradability, and abundant functional groups (-NH 2 , -OH, -COOH), chitosan is often used for functionalized assembly with nano-Fe 3 O 4 [83][84][85]. A complexation effect easily occurs between chitosan and nano-Fe 3 O 4 particles, facilitated by the nitrogen atoms in the amine groups of the chitosan sharing lone electron pairs with divalent or trivalent iron on the surface of the nano-Fe 3 O 4 .…”