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Facilitated Transport of CO2 Through the Transparent and Flexible Cellulose Membrane Promoted by Fixed-Site Carrier
- Zhang, Xiong-Fei, Hou, Ting, Chen, Jin, Feng, Yi, Li, Bengang, Gu, Xiaoli, He, Ming, Yao, Jianfeng
- ACS applied materials & interfaces 2018 v.10 no.29 pp. 24930-24936
- calcium, calcium chloride, carbon dioxide, cellulose, hydrogen bonding, ions, nanofibers, nitrogen, permeability, solvents, zinc
- Facilitated transport cellulose membranes with different zinc ion loadings are fabricated via a facile and green solvent system (zinc chloride/calcium chloride solution). Zn²⁺ ions lower the pristine hydrogen bonds that normally reinforce the cellulose chains, and Ca²⁺ ions facilitate interactions among the Zn–cellulose chains to form nanofibrils. The strategy provides an effective route to immobilize zinc species into membrane matrix and constructs facilitated transport pathway for CO₂ molecules. The self-standing membranes are transparent, flexible and demonstrate ultraselective CO₂ permeation. The optimum separation performance is achieved over CM-0 with the highest zinc content (22.2%), and it exhibits a CO₂ permeability of 155.0 Barrer, with selectivity ratios of 27.2 (CO₂/N₂) and 100.6 (CO₂/O₂). The excellent separation performance is assigned to the π complexation mechanism between Zn²⁺ and CO₂.