Kim Hyunyoung, Sohn Hiesang, Kang Sang Wook
Department of Chemistry, Sangmyung University, Seoul 03016, Republic of Korea.
Department of Chemical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea.
J Nanosci Nanotechnol. 2018 Aug 1;18(8):5817-5821. doi: 10.1166/jnn.2018.15413.
CdO nanoparticles were utilized in the fabrication of a composite membrane containing the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF-4) for CO2 separation. The use of BMIM+BF-4containing CdO nanoparticles as a CO2 separator greatly improved separation performance. The ideal selectivity for CO2/N2 was 32.5 with a CO2 permeance of 57.1 GPU when CdO 4 liquid. The enhanced separation performance nanoparticles were incorporated into the BMIM+BF-4and the was attributed to increased CO2 solubility facilitated by both the free ions in BMIM+BF-4 oxide layer of the CdO nanoparticle. The CdO nanoparticles were identified with transmission electron microscopy and the physical and chemical properties of the membranes were investigated using scanning electron microscopy, Raman spectroscopy and TGA. Interestingly, we found a correlation between CO2 permeance and electronegativity differences between the metal and oxygen for CO2 separation membrane. The electronegativity differences between the metal and oxygen was ZnO (1.79) > CdO (1.75) > CuO (1.54) > AgO (1.51). The order of CO2 permeance was ZnO in BMIM+BF-4 (101 GPU) > CdO in BMIM+BF-4 (57.1 GPU) > CuO in BMIM+BF-4 (52.4 GPU) > AgO in BMIM+BF-4 (14.1 GPU).
氧化镉纳米颗粒被用于制备包含离子液体1-丁基-3-甲基咪唑四氟硼酸盐（BMIM⁺BF₄⁻）的复合膜，用于二氧化碳分离。使用含有BMIM⁺BF₄⁻的氧化镉纳米颗粒作为二氧化碳分离器大大提高了分离性能。当氧化镉纳米颗粒被掺入BMIM⁺BF₄离子液体中时，二氧化碳/氮气的理想选择性为32.5，二氧化碳渗透率为57.1 GPU。分离性能的提高归因于BMIM⁺BF₄中的自由离子和氧化镉纳米颗粒的氧化层促进了二氧化碳溶解度的增加。通过透射电子显微镜鉴定了氧化镉纳米颗粒，并使用扫描电子显微镜、拉曼光谱和热重分析研究了膜的物理和化学性质。有趣的是，我们发现了用于二氧化碳分离膜的二氧化碳渗透率与金属和氧之间的电负性差异之间的相关性。金属和氧之间的电负性差异为氧化锌（1.79）>氧化镉（1.75）>氧化铜（1.54）>氧化银（1.51）。二氧化碳渗透率的顺序为BMIM⁺BF₄中的氧化锌（101 GPU）>BMIM⁺BF₄中的氧化镉（57.1 GPU）>BMIM⁺BF₄中的氧化铜（52.4 GPU）>BMIM⁺BF₄中的氧化银（14.1 GPU）。
