Abstract
Nitrogen-doped porous carbon (NPC) has a rich microporous structure and nitrogen-rich units, and its nitrogen-containing group can interact strongly with the PEO chain segment of Pebax, synergistically improving its CO2 adsorption ability and interface compatibility. This work prepared three types of triazine-based NPCs with mesoporous and high N-content and added NPCs to Pebax-2533 to prepare NPC/Pebax-2533 MMMs. The effects of N-type, N-content, and pore structure of NPCs on the gas separation performance of MMMs were studied. Constructing a continuous meso-microporous structure within the membrane and adding alkaline N-containing groups were beneficial for promoting rapid CO2 transport. Among the three NPCs, NPC-1/Pebax MMMs prepared using NPC-1 with the highest N-content (10.91%) and suitable pore structure exhibited the best gas separation performance. To investigate the gas transport mechanism of NPC in MMMs, NPC-1 was added to Pebax-2533 and Pebax-1657. The permeability of 3NPC-1/Pebax-2533 MMMs and 0.5NPC-1/Pebax-1657 MMMs reached 423 Barrer and 178 Barrer, with a CO2/N2 selectivity of 61 and 75.8, respectively, both higher than the Pebax-2533 and Pebax-1657. Adding NPC-1 to Pebax-2533 and Pebax-1657 increased the solubility and diffusivity coefficient of MMMs by 40 ~ 80%, and the gas separation performance did not rapidly decrease after long-term stability of 120 h (15%CO2/N2). Compared with NPC-1/Pebax-1657 MMMs, NPC-1/Pebax-2533 MMMs had higher CO2 permeability, mechanical properties, solubility, and diffusivity coefficient. The above results indicated that NPC was more suitable for Pebax-2533.
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Thanks for the help of the Analysis and Testing Center, International Joint Lab of Jiangsu Education Department, and NERC Biomass of Changzhou University.
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This work was supported by the National Key Research and Development Program of China (2022YFB3805003), the Changzhou Sci&Tech Program (CZ20220033 and CZ20230022), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX22_3026), and the National Natural Science Foundation of China (Grant No. 22108015). This work was also partially supported by the Kobe University Strategic International Collaborative Research Grant (Type B Fostering Joint Research).
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Peilin Li: Conceptualization, Methodology, Investigation, Experiment, Writing-Original Draft. Wenzhong Ma: Methodology, Writing Review & Editing. Jing Zhong: Conceptualization, Funding acquisition, Resources, Supervision, Writing Review & Editing. Yang Pan: Investigation, Methodology. Xiuxiu Ren: Investigation, Methodology. Meng Guo: Resources, Supervision. Nanhua Wu: Investigation, Methodology. Hideto Matsuyama: Writing Review & Editing.
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Li, P., Ma, W., Zhong, J. et al. Research on triazine-based nitrogen-doped porous carbon/Pebax mixed-matrix membranes for CO2 separation and its gas transport mechanism. J Nanopart Res 26, 108 (2024). https://doi.org/10.1007/s11051-024-06015-1
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DOI: https://doi.org/10.1007/s11051-024-06015-1