Haiyan Jiang , Bingbing Yang , Kuilin Peng , Zetao Liu , Shaojuan Zeng , Xiangping Zhang , Lu Bai
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引用次数: 0
摘要
离子液体(ILs)与膜的结合是一种直接分离 NH 的潜在方法。特别是,离子液体可以调节与 NH 的相互作用,并在膜中构建 NH 的优先传输路径,从而有望克服权衡效应,实现理想的分离性能。本研究将[2-Mim][Li(NTf)]、[Eim][Li(NTf)]、[Bmim][Co(NCS)]和[Bim][Co(NCS)]等四种具有不同金属中心和氢键捐赠能力的金属离子交换树脂(MIL)加入磺化嵌段共聚物中,制备了基于 MIL 的 NH 分离混合膜。结构-性能关系的研究表明,相互作用位点和传输通道可通过 MIL 类型进行调整,这在很大程度上影响了膜的 NH 分离性能。Nexar/2-Mim-Li-10 膜的 NH 渗透率为 735.6 Barrer,NH/N 选择性为 844.5,NH/H 选择性为 154.7。提高 MIL 含量和进料压力可显著改善 NH 分离性能。
Metal ionic liquid-based hybrid membranes for ammonia separation through moderate interaction sites and cooperative transport channels
The combination ionic liquids (ILs) with membranes is a potential method for direct NH3 separation. In particular, ILs can modulate the interactions with NH3 and construct pathways in membranes for preferential NH3 transport, which is expected to overcome the trade-off effect and achieve a desirable separation performance. In this work, four metal ILs (MILs) with different metal centres and hydrogen bond donating ability, including [2-Mim][Li(NTf2)2], [Eim][Li(NTf2)2], [Bmim]2[Co(NCS)4], and [Bim]2[Co(NCS)4], were incorporated into sulfonated block copolymers to prepare MIL-based hybrid membranes for NH3 separation. The investigation of structure–performance relationships suggested that the interaction sites and transport channels could be tuned by the MIL type, which greatly affects the NH3 separation performance of the membranes. The Nexar/2-Mim-Li-10 membrane exhibits NH3 permeability of 735.6 Barrer with NH3/N2 selectivity of 844.5 and NH3/H2 selectivity of 154.7, which is higher than other MIL-based hybrid membranes owing to self-assembled transport channels and moderate complexation. Increasing the MIL content and feed pressure significantly improved NH3 separation performance.
期刊介绍:
Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline.
Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.