Enhancing CO2/N2 and CO2/CH4 Separation Properties of PES/SAPO-34 Membranes Using Choline Chloride-Based Deep Eutectic Solvents as Additives.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL
Jonathan S Cardoso, Zhi Lin, Paulo Brito, Licínio M Gando-Ferreira
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引用次数: 0

Abstract

CO2 separation is an important environmental method mainly used in reducing CO2 emissions to mitigate anthropogenic climate change. The use of mixed-matrix membranes (MMMs) arrives as a possible answer, combining the high selectivity of inorganic membranes with high permeability of organic membranes. However, the combination of these materials is challenging due to their opposing nature, leading to poor interactions between polymeric matrix and inorganic fillers. Many additives have been tested to reduce interfacial voids, some of which showed potential in dealing with compatibility problems, but most of them lack further studies and optimization. Deep eutectic solvents (DESs) have emerged as IL substitutes since they are cheaper and environmentally friendly. Choline chloride-based deep eutectic solvents were studied as additives in polyethersulfone (PES)/SAPO-34 membranes to improve CO2 permeability and CO2/N2 and CO2/CH4 selectivity. SAPO-34 crystals of 150 nm with a high surface area and microporosity were synthesized using dry-gel methodology. The PES/SAPO-34 membranes were optimized following previous work and used in a defined composition, using 5 or 10 w/w% of DES during membrane preparation. All MMMs were characterized by their ideal gas permeability using N2 and CO2 pure gasses. Selected membranes were also tested using CH4 pure gas. The results presented that 5 w/w%, in polymer mass, of ChCl-glycerol presented the best result over the synthesized membranes. An increase of 200% in CO2 permeability maintains the CO2/N2 selectivity for the non-modified PES/SAPO-34 membrane. A CO2/CH4 selectivity of 89.7 was obtained in PES/SAPO-34/ChCl-glycerol membranes containing 5 w/w% of this DES, which is an outstanding ideal separation performance for MMMs when compared to other results in the literature. FTIR analysis reiterates the presence of glycerol in the membranes prepared. Dynamic Mechanical Thermal Analysis (DMTA) shows that the addition of 5 w/w% of DES does not impact the membrane flexibility or polymer structure. However, in concentrations higher than 10 w/w%, the inclusion of DES could lead to high membrane rigidification without impacting the overall thermal resistance. SEM analysis of DES-enhanced membranes presented asymmetric final membranes and reaffirmed the results obtained in DMTA about rigidified structures and lower zeolite-polymer interaction with higher concentrations of DES.

使用氯化胆碱基深共晶溶剂作为添加剂增强 PES/SAPO-34 膜的 CO2/N2 和 CO2/CH4 分离性能。
二氧化碳分离是一种重要的环保方法,主要用于减少二氧化碳排放,以缓解人为气候变化。使用混合基质膜(MMMs)是一种可能的解决方案,它结合了无机膜的高选择性和有机膜的高渗透性。然而,由于这些材料的性质相反,导致聚合物基质和无机填料之间的相互作用不佳,因此将它们结合在一起具有挑战性。为了减少界面空隙,已经对许多添加剂进行了测试,其中一些添加剂在解决兼容性问题方面显示出了潜力,但大多数添加剂都缺乏进一步的研究和优化。深共晶溶剂(DES)因其更便宜、更环保,已成为 IL 的替代品。研究人员将氯化胆碱基深共晶溶剂作为聚醚砜(PES)/SAPO-34 膜的添加剂,以改善二氧化碳渗透性以及 CO2/N2 和 CO2/CH4 的选择性。采用干凝胶法合成了具有高比表面积和微孔的 150 纳米 SAPO-34 晶体。根据之前的工作对 PES/SAPO-34 膜进行了优化,并在膜制备过程中使用了 5 或 10 w/w% 的 DES,以确定膜的成分。使用 N2 和 CO2 纯气体对所有 MMM 的理想气体渗透性进行了表征。还使用 CH4 纯气体对选定的膜进行了测试。结果表明,在合成的膜中,以聚合物质量计,5 w/w% 的 ChCl-甘油效果最好。二氧化碳渗透率增加 200% 后,未改性的 PES/SAPO-34 膜仍能保持 CO2/N2 选择性。含有 5 w/w% DES 的 PES/SAPO-34/ChCl-glycerol 膜的 CO2/CH4 选择性为 89.7,与文献中的其他结果相比,这是 MMMs 理想分离性能的突出表现。傅立叶变换红外分析证实了制备的膜中存在甘油。动态机械热分析(DMTA)显示,添加 5 w/w% 的 DES 不会影响膜的柔韧性或聚合物结构。然而,当浓度高于 10 w/w% 时,DES 的加入会导致膜高度僵化,但不会影响整体热阻。对 DES 增强膜的 SEM 分析表明,最终膜不对称,并再次证实了在 DMTA 中获得的结果,即随着 DES 浓度的提高,膜结构变硬,沸石与聚合物之间的相互作用降低。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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