Modification and characterization of polyacrylonitrile fiber by chelating ligand for preconcentration and determination of neodymium ion in biological and environmental samples

摘要

In this study a chelating fiber containing iminodiacetic acid was prepared via the stepwise modification of acrylic fibers, polyacrylonitrile. The resulting modified fiber has been characterized by Fourier transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, and scanning electron microscopy. Then polyacrylonitrile- iminodiacetic acid was applied for preconcentration and determination of trace Nd(III) ion from human biological fluid and environmental water samples with inductively coupled plasma - atomic emission spectroscopy. The optimum pH value for sorption of the metal ion was 6. The sorption capacity of functionalized resin is 8.9 mg g~(-1). A recovery of 100% was obtained with preconcentration factor 10 for the Nd(III) with 0.5 M nitric acid as eluting agent. The profile of Nd(III) uptake on this sorbent reflects good accessibility of the chelating sites in the modified polyacrylonitrile. Scatchard analysis revealed that the homogeneous binding sites were formed in the polymers. The equilibrium adsorption data of Nd(III) on modified fiber were analyzed by Langmuir models.