| 초록 |
Silver nanoparticles were activated by electron acceptors such as p-benzoquinone (pBQ) and tetracyanoquinodimethane (TCNQ) to increase interactions with olefin molecules, which can be utilized as an olefin carrier for facilitated transport membranes to separate olefin/paraffin mixtures. The PVP/Ag metal membranes activated TCNQ showed better separation performance than those activated pBQ. Work function by Kelvin probe method and binding energy by XPS showed that the introduction of TCNQ caused the surface of the silver nanoparticles to become more positively polarized than with the use of pBQ, resulting in increased carrier activity of silver nanoparticles toward olefin molecules, and consequently, resulted in facilitated olefin transport. The higher separation performance of the membranes activated TCNQ (compared to pBQ) is attributable to the stronger electron affinity of TCNQ, and consequently, the higher charge density of metallic silver nanoparticles. |
