用于 CO2/CH4 分离的 ZIF-8、胺改性 ZIF-8 和聚砜基混合基质膜的研究,Journal of Applied Polymer Science

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用于 CO2/CH4 分离的 ZIF-8、胺改性 ZIF-8 和聚砜基混合基质膜的研究
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-09-01 , DOI: 10.1002/app.54650
Aditya Jonnalagedda ₁ , Bhanu Vardhan Reddy Kuncharam ₁

Affiliation

膜分离是沼气升级技术之一。目前正在探索混合基质膜（MMM），以克服用于气体分离的聚合物膜固有的选择性-渗透性的权衡。与 MMM 相关的一个重大挑战是聚合物-金属-有机骨架 (MOF) 填料界面相容性较差，从而降低了气体的选择性或渗透性。为了解决这个问题，本研究重点研究ZIF-8的胺官能化对增强CO ₂气体渗透而不降低CO ₂ /CH ₄选择性的影响。使用未改性的 ZIF-8 和胺改性的 ZIF-8 纳米填料以 5、10 和 15 wt% 的负载量分散在聚砜中制备 MMM。MMM 通过 FTIR、DSC、TGA 和 FESEM 进行表征。通过 X 射线衍射和 FTIR 分析验证了 ZIF-8 的胺改性。_{此外，使用纯气体（CO 2}和CH _{4 ）以及CO}₂和CH ₄的模型混合物测试了MMM的性能。在混合气体渗透测试中，10wt％ZIF-8MMM表现出最高的CO ₂渗透性，为25.4Barrers，而15wt％NH ₂ -ZIF-8MMM表现出最高的选择性，为13.5。值得注意的是，与纯聚砜膜相比，ZIF-8 MMM 表现出 CO ₂ /CH ₄选择性增加了 148%，而 NH _{2 -ZIF-8 MMM 表现出 155% 增加。}

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Investigation of ZIF-8, amine-modified ZIF-8 and polysulfone based mixed matrix membranes for CO2/CH4 separation

Membrane separation is one of the techniques used for biogas upgradation. Mixed matrix membranes (MMMs) are currently being explored to overcome the trade-off of selectivity-permeability inherent in polymer membranes used for gas separation. A significant challenge associated with MMMs is the poor polymer-metal–organic framework (MOF) filler interfacial compatibility, reducing the selectivity or permeability of gas. To address this issue, the present study focuses on the effect of the amine functionalization of ZIF-8 to enhance the CO₂ gas permeation without reducing the CO₂/CH₄ selectivity. MMMs were fabricated using unmodified ZIF-8 and amine-modified ZIF-8 nanofillers dispersed in polysulfone at 5, 10, and 15 wt% loadings. MMMs were characterized by FTIR, DSC, TGA, and FESEM. X-ray diffraction and FTIR analysis was conducted to verify the amine modification of ZIF-8. Further, the performance of MMMs was tested with pure gasses (CO₂ and CH₄) and a model mixture of CO₂ and CH₄. In the mixed gas permeation test, the 10 wt% ZIF-8 MMM exhibited the highest CO₂ permeability of 25.4 Barrers, while 15 wt% NH₂-ZIF-8 MMM exhibited the highest selectivity of 13.5. Notably, the ZIF-8 MMMs demonstrated a 148% increase in CO₂/CH₄ selectivity, whereas the NH₂-ZIF-8 MMMs exhibited a 155% increase compared to the pure polysulfone membrane.

更新日期：2023-09-01

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