Preparation of Amidoxime Polyacrylonitrile Chelating Nanofibers and Their Application for Adsorption of Metal Ions

Abstract

Polyacrylonitrile (PAN) nanofibers were prepared by electrospinning and they were modified with hydroxylamine to synthesize amidoxime polyacrylonitrile (AOPAN) chelating nanofibers, which were applied to adsorb copper and iron ions. The conversion of the nitrile group in PAN was calculated by the gravimetric method. The structure and surface morphology of the AOPAN nanofiber were characterized by a Fourier transform infrared spectrometer (FT-IR) and a scanning electron microscope (SEM), respectively. The adsorption abilities of Cu2+ and Fe3+ ions onto the AOPAN nanofiber mats were evaluated. FT-IR spectra showed nitrile groups in the PAN were partly converted into amidoxime groups. SEM examination demonstrated that there were no serious cracks or sign of degradation on the surface of the PAN nanofibers after chemical modification. The adsorption capacities of both copper and iron ions onto the AOPAN nanofiber mats were higher than those into the raw PAN nanofiber mats. The adsorption data of Cu2+ and Fe3+ ions fitted particularly well with the Langmuir isotherm. The maximal adsorption capacities of Cu2+ and Fe3+ ions were 215.18 and 221.37 mg/g, respectively.

Laccase Immobilization by Chelated Metal Ion Coordination Chemistry

“…The reaction was carried out at 50-60 °C for 2 h. After being thoroughly washed, the AOPAN nanofibrous membranes were dried in vacuum oven at 50 °C. The conversion of nitrile group in the PAN was calculated as follows [21]:…”

Research into complexing properties of polyacrylonitrile complexite in the mixtures of water-dioxane

“…Polyacrylonitrile modified fibers were investigated with a view to their practical application for selective sorption of ions of Cr(III) [13], Pd(II), Pt(IV) [14,15]. In this case, the authors of [10][11][12][13][14][15] resolve issues related only to quantitative characteristics of sorption processes, without identifying mechanisms of the process, stoichiometry of resulting complexes.…”

“…Thus, authors [10][11][12] studied processes of adsorption of copper(II) on the modified polyacrylonitrile nano-fiber by the method of atomic adsorption. Polyacrylonitrile modified fibers were investigated with a view to their practical application for selective sorption of ions of Cr(III) [13], Pd(II), Pt(IV) [14,15].…”

“…An analysis of the scientific literature [10][11][12][13][14][15][16][17] indicates the fact that the systems with polymer ligands in aqueous-organic solvents in the presence of transition metal ions are not studied sufficiently. It is expedient to examine the complexation processes in such complex systems based on the exploration of influence of a solvating factor on the reactivity of groups in polymers, and on their matrix.…”

Coaxial Electrospun Cellulose-Core Fluoropolymer-Shell Fibrous Membrane from Recycled Cigarette Filter as Separator for High Performance Lithium-Ion Battery

“…To generate high quantities of fine pores desirable for lithium-ion diffusion to perform the charge− discharge behavior while with excellent physical integrity, a network of ultrafine and nanoscale fibers produced by electrospinning is a viable option. 18,19 Our group has proved that coaxial electrospinning is a simple and low-cost approach to achieve core/shell nanofibers, and the core/shell structure can be manipulated by selectively adjusting solution properties and operating parameters. 20 Here, cellulose acetate was extracted and purified from waste cigarette filter tips, and was coaxially electrospun with PVDF-HFP to prepare a cellulosebased core/shell nanofiber membrane.…”