| 초록 |
Flexible zeolite nanofibers based on a core-shell structure were prepared by a single step electrospinning process, and the strength and surface area were improved by a shell polymer wet etching process. Field-emission scanning electron microscopy (FE-SEM) and atomic force microscope (AFM) images show that the zeolite particles in the as-spun zeolite nanofibers were embedded in the core-shell fiber structure of poly(vinylidene fluoride)(PVDF)/polyvinylpyrrolidone(PVP). After a shell polymer wet etching process, the grain shapes of zeolite particles were clearly observed, because of the exposed zeolite particles by wet etching the hydrophilic PVP polymer in the shell parts. The adsorption/desorption characteristics of the flexible zeolite fiber filters with a diameter of 7 cm were investigated by gas chromatography (GC), and longer breakthrough times of about 145 minutes in the breakthrough curve and the maximum desorption temperature of 134 ℃ in the TPD curve were observed. |
