偕胺肟基PAN螯合纳米纤维的制备及其对金属离子的吸附性能

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