用于膜中的 MIL-53(Al)纳米片，提高了 CO/N 和 CO/CH 的选择性。
Nanosheets of MIL-53(Al) applied in membranes with improved CO/N and CO/CH selectivities.
机构信息
Chemical and Environmental Engineering Department, Instituto de Nanociencia de Aragón (INA) and Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, 50018 Zaragoza, Spain.
出版信息
Dalton Trans. 2019 Mar 5;48(10):3392-3403. doi: 10.1039/c8dt03774d.
MIL-68(Al) and MIL-53(Al) are carboxylate-based metal-organic frameworks (MOFs) with the same chemical composition but different structures (polymorphs). In this study, MIL-53(Al) nanosheets of ca. 150 nm in size with an average thickness of 3.5 ± 0.9 nm were obtained after immersion of a sample composed of MIL-68(Al) and MIL-53(Al) in water under different conditions (ultrasound, stirring, reflux, 60 °C and room temperature). The disaggregated MIL-53(Al) nanosheets produced under more severe conditions were suspended in a PDMS solution and then deposited on asymmetric polyimide P84® supports under vacuum filtration to form supported mixed matrix membranes (MMMs). When applied to the separation of CO2/CH4 and CO2/N2 mixtures, the MMM with MIL-53(Al) nanosheets improved the CO2/CH4 (28.4-28.7 vs. 22.4) and CO2/N2 (19.9-23.2 vs. 17.5) selectivities of the conventional MIL-53(Al) MMM with higher CO2 permeances (20.8-29.6 GPU vs. 9.5 GPU for CO2/CH4 and 17.7-26.8 GPU vs. 11.2 GPU for CO2/N2).
MIL-68(Al) 和 MIL-53(Al) 是基于羧酸的金属有机骨架（MOFs），具有相同的化学组成但结构不同（多晶型物）。在这项研究中，在不同条件（超声、搅拌、回流、60°C 和室温）下将 MIL-68(Al) 和 MIL-53(Al) 组成的样品浸入水中后，得到了约 150nm 大小的 MIL-53(Al) 纳米片，平均厚度为 3.5±0.9nm。在更苛刻的条件下产生的解团聚 MIL-53(Al) 纳米片悬浮在 PDMS 溶液中，然后在真空过滤下沉积在不对称聚酰亚胺 P84® 支撑体上，形成负载混合基质膜（MMM）。当应用于 CO2/CH4 和 CO2/N2 混合物的分离时，负载 MIL-53(Al) 纳米片的 MMM 提高了 CO2/CH4（28.4-28.7 对 22.4）和 CO2/N2（19.9-23.2 对 17.5）的选择性，同时具有更高的 CO2 渗透性（20.8-29.6 GPU 对 CO2/CH4 和 17.7-26.8 GPU 对 CO2/N2）。
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