Preparation and Characterization of a Novel Amidoxime-Modified Polyacrylonitrile/Fly Ash Composite Adsorbent and Its Application to Metal Wastewater Treatment

Yan Sun, Xiaojun Song, Jing Ma, Haochen Yu, Gangjun Liu and Fu Chen
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Yan Sun: School of Public Administration, Hohai University, Nanjing 210098, China
Xiaojun Song: School of Public Administration, Hohai University, Nanjing 210098, China
Jing Ma: School of Public Administration, Hohai University, Nanjing 210098, China
Haochen Yu: School of Public Policy, China University of Mining and Technology, Xuzhou 221043, China
Gangjun Liu: Geospatial Science, School of Science, STEM College, RMIT University, Melbourne 3000, Australia
Fu Chen: School of Public Administration, Hohai University, Nanjing 210098, China

IJERPH, 2022, vol. 19, issue 2, 1-13

Abstract: The polyacrylonitrile/fly ash composite was synthesized through solution polymerization and was modified with NH 2 OH·HCl. The amidoxime-modified polyacrylonitrile/fly ash composite demonstrated excellent adsorption capacity for Zn 2+ in an aqueous medium. Fourier transform-Infrared spectroscopy, thermogravimetric analysis, nitrogen adsorption, X-ray diffraction, and scanning electron microscopy were used to characterize the prepared materials. The results showed that the resulting amidoxime-modified polyacrylonitrile/fly ash composite was able to effectively remove Zn 2+ at pH 4–6. Adsorption of Zn 2+ was hindered by the coexisting cations. The adsorption kinetics of Zn 2+ by Zn 2+ followed the pseudo-second order kinetic model. The adsorption process also satisfactorily fit the Langmuir model, and the adsorption process was mainly single layer. The Gibbs free energy ΔG 0 , ΔH 0 , and ΔS 0 were negative, indicating the adsorption was a spontaneous, exothermic, and high degree of order in solution system.

Keywords: amidoxime-modified polyacrylonitrile/fly ash composite; fly ash; Zn 2+; adsorption (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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