Abstract
Clean silver nanoparticles on sugar crystals (Ag–sugar) were prepared by the plasma-ion method and were subsequently dispersed in an ionic liquid, 1-butyl-3-methyl imidazolium tetrafluroborate (BMIM +BF 4 −). Membranes containing Ag–sugar dispersed in BMIM +BF 4 − showed a mixed gas selectivity of up to 14.4 for the separation of a propylene/propane (50/50 vol%) mixture, demonstrating facilitated olefin transport. Facilitated olefin transport occurs due to carrier action of the partially positively charged surface of the silver nanoparticles, which is induced by BMIM +BF 4 −. The formation of this partially positive surface charge may be due to the interactions of the silver nanoparticles with the free anions of BMIM +BF 4 −. The formation of a partially charged surface was made evident by an increased binding energy of silver, observed using X-ray photoelectron spectroscopy (XPS). Free anion formation was monitored by using FT-Raman spectra of BMIM +BF 4 −. Surprisingly, an extremely small amount of the activated silver nanoparticles (663.5 ppm) were required to provide good separation performance in propylene/propane mixtures.
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