We report the facilitated CO2 transport membrane by in situ preparation of copper nanoparticles by ionic liquid, such as HmimNO3. The dissociation mechanism of micro-sized copper flakes into surface activated copper nanoparticles in terms of the interface dipole at the organic/metal was suggested. Firstly, HmimNO3 adsorbed onto pristine micro-sized copper flakes consisted of clusters, and then the concentration of electrons in the NO3- lead to the positive charging of the vacuum side. The built-in potential at the interface of HmimNO3/Cu clusters was able to bring out the repulsive force among the positive charged Cu clusters, resulting in the formation of CuNPs. Furthermore, the fabricated Cu nanoparticles (CuNPs) could be utilized as not only CO2 carriers, but also barriers regarding N2 and CH4 transport. The ideal CO2/CH 4 and CO2/N2 separation factor of HmimNO 3 membranes with a polysulfone asymmetric support was 2.3 and 2.6, respectively. The HmimNO3/CuNPs nanocomposite showed selectivity for CO2/CH4 and CO2/N2 was found to be 6.2 and 7.4, respectively. This implied the surface positive polarized CuNPs addition could be one of the effective strategies toward maximizing CO 2 separation.
Bibliographical noteFunding Information:
This work was supported by a Grant for Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Korean government Ministry of Knowledge Economy ( 20122010100040 ). This work was also supported by the Basic Science Research Program ( 20120003368 ) and Korea CCS R&D Center through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology. Y.S. Kang also acknowledges Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) of Korea for the Center for Next Generation Dye-sensitized Solar Cells (2011-0001055).
- CO separation
- Composite material
- Cu nanoparticle
- Facilitated transport membrane
- Ionic liquid