期刊
JOURNAL OF MEMBRANE SCIENCE
卷 374, 期 1-2, 页码 43-48出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.03.005
关键词
Copper nanoparticle; Ionic liquid; Interaction; Olefin and facilitated transport
资金
- Korea Center for Artificial Photosynthesis (KCAP) in Sogang University [NRF-2009-C1AAA001-2009-0093879]
- Basic Science Research Program for the Center for Next Generation Dye-sensitized Solar Cells [2010-0001842]
- Ministry of Education, Science and Technology (MEST) of Korea [R31-2008-000-10092]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2006EID11P101000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0093883, 2008-0062496, R31-2011-000-10092-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Effects of ionic liquids on dissociation of micrometer-sized copper flakes into copper nanoparticles and on facilitated olefin transport were investigated. Three different ionic liquids (ILs) of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM(+)BF(4)(-)), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM(+)PF(6)(-)) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIM(+)BF(4)(-)) were employed for facile synthesis of copper nanoparticles and for inducing the partial surface positive charge of the copper nanoparticles for facilitated olefin transport. The positively charged surface was induced by interactions with anion of the ILs as evidenced by FT-Raman spectroscopy. The intensity of the interactions depending upon the ionic liquid resulted in the difference in the size and its distribution of the nanoparticles as confirmed by TEM images and UV-vis spectra. The separation performance of the ionic liquid/Cu metal composite membranes for olefin/paraffin mixtures was in the following order: EMIM(+)BF(4)(-)/Cu < BMIM(+)PF(6)(-)/Cu < BMIM(+)BF(4)(-)/Cu. Surprisingly, the binding energies of the copper atoms in the ionic liquid/Cu metal composites were strongly correlated the separation performance. Consequently, it was concluded that facilitated olefin transport was consistent with the trend of increasing binding energy of copper atoms. (C) 2011 Elsevier B.V. All rights reserved.
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