| 초록 |
Polymer electrolyte membranes consisting of a polyvinylpyrrolidone (PVP)/AgCF3SO3/Al(NO3)3 complex were prepared for the separation of a propylene/propane mixture. Recently, Al(NO3)3 was used to suppress reduction of silver ions generated from AgBF4. In this study, the effect of Al(NO3)3 on inhibiting the reduction of silver ions generated from AgCF3SO3 was investigated, where AgCF3SO3 was used as a cost-effective alternative to AgBF4 in the facilitated olefin transport membranes. When Al(NO3)3 was incorporated into a PVP/AgCF3SO3 complex membrane, the selectivity of propylene/propane and mixed gas permeance showed 5 and 0.5GPU, respectively. Moreover, the PVP/AgCF3SO3/Al(NO3)3 complex membranes showed long-term stability although AgCF3SO3 is easily reduced to silver nanoparticles. It was thus proved that Al(NO3)3 played the role of a retardant for the reduction of silver ions generated from AgCF3SO3 as well as from AgBF4. The coordinative interaction of the PVP/AgCF3SO3/Al(NO3)3 complex membranes were investigated by Fourier transform (FT) infrared, X-ray photoelectron, and FT-Raman spectroscopy. |
