Characterization and Mechanistic Study of Heavy Metal Adsorption by Facile Synthesized Magnetic Xanthate-Modified Chitosan/Polyacrylic Acid Hydrogels

Liming Dong, Chengyang Shan, Yuan Liu, Hua Sun, Bing Yao, Guizhen Gong, Xiaodong Jin () and Shifan Wang ()
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Liming Dong: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Chengyang Shan: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Yuan Liu: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Hua Sun: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Bing Yao: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Guizhen Gong: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China
Xiaodong Jin: Department of Forensic Science and Technology, Jiangsu Police Institute, Nanjing 210031, China
Shifan Wang: School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China

IJERPH, 2022, vol. 19, issue 17, 1-12

Abstract: A simple method was used to synthesize magnetic xanthate-modified chitosan/polyacrylic acid hydrogels that were used to remove heavy metal ions from an aqueous solution. Xanthate modification of chitosan significantly improved adsorption performance: individual adsorption capacities of the hydrogel for Cu(II), Cd(II), Pb(II), and Co(II) ions were 206, 178, 168, and 140 mg g −1 , respectively. The magnetic hydrogels had good regeneration ability and were effectively separated from the solution by use of a magnet. Adsorption kinetic data showed that the removal mechanism of heavy metal ions from the solution by magnetic hydrogels occurs mainly by chemical adsorption. The equilibrium adsorption isotherms were well-described by the Freundlich and Langmuir equations. Positive values were found for the Gibbs standard free energy and enthalpy, indicating an increase in the disorder at the solid–liquid interface during adsorption. Magnetic xanthate-modified chitosan-based hydrogels that exhibit high adsorption efficiency, regeneration, and easy separation from a solution have broad development prospects in various industrial sewage and wastewater treatment fields.

Keywords: magnetic hydrogels; chitosan; adsorption mechanism; heavy metal; wastewater treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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