Synthesis and Spectroscopic Characterization of Polyethylenepolyamine-Modified Polyacrylonitrile (PPA) Fiber for Future Metal-Ion Analysis
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Avazyazov Mukhammad, Ashirov Mansur
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Polyacrylonitrile (PAN) fiber was sequentially modified through alkaline hydrolysis, amination/amidoximation with hydroxylamine hydrochloride and hydrazinium chloride, grafting with polyethylenepolyamine (PEPA), and acid activation to produce a chemically functionalized PPA fiber suitable as a solid support for reagent immobilization. Ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid), a well-established chromogenic reagent for Fe(III), Fe(II), and Al(III) ions, was subsequently immobilized onto the PPA fiber by equilibrium sorption from a 0.0057 M aqueous solution at 25 °C for 24 h. The parent PAN, synthesized PPA, and Ferron-immobilized PPA fibers were characterized by Fourier-transform infrared (FTIR) spectroscopy and diffuse reflectance spectroscopy (DRS) using an EFI ES-2000 color calibrator spectrophotometer. FTIR analysis confirmed the partial conversion of nitrile groups (2241 cm−1) into amide, amidoxime, and amine-related functionalities, with progressive spectral changes upon each modification step. Immobilization of Ferron introduced additional absorption bands consistent with aromatic and sulfonate functional groups. DRS measurements revealed a pronounced optical response in the 380–520 nm region for the Ferron-immobilized fiber, distinct from the unmodified PPA spectrum. These results establish that PPA fiber effectively retains Ferron on its surface and that the immobilized reagent retains its chromogenic functionality, providing a spectroscopic basis for the future development of a solid-phase colorimetric sensor for the qualitative and quantitative determination of Fe(III), Fe(II), and Al(III) ions in wastewater samples.
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Authors
Avazyazov Mukhammad, Ashirov Mansur
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