Nanostructured membranes containing UiO-66 (Zr) and MIL-101 (Cr) for O2/N2 and CO2/N2 separation
Nanostructured membranes containing UiO-66 (Zr) and MIL-101 (Cr) for O2/N2 and CO2/N2 separation
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DOI：
10.1016/j.seppur.2017.10.024
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发表时间：
2018-02-09
影响因子：
8.6
通讯作者：
Ferraz, Helen Conceicao
中科院分区：
文献类型：
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作者：
Rodrigues, Maira Andrade;Ribeiro, Jessica de Souza;Ferraz, Helen Conceicao
含有锆和铬金属的金属-有机框架（MOF）已被报道为用于气体储存和分离的气体材料，特别是用于CO2。MOF的高选择性可以通过它们在聚合物基质中的分散来利用，从而产生用于气体分离和吸附中的不同应用的混合基质膜。本研究报告了使用纳米结构的混合基质膜（MMM），生产的MOF UiO-66（锆）和MIL-101（铬）在聚氨酯的O-2/N-2和CO2/N-2气体分离。采用SEM、XRD、TGA和FTIR等手段对UiO-66（Zr）、MIL-101（Cr）及复合材料进行了表征，结果表明，成功合成了MOFS。获得了无缺陷的致密PU/UiO-66（Zr）膜，由于较高的氧渗透性，具有增加的选择性。对于MIL-101（Cr）膜，没有观察到氧选择性和渗透性的显著增加。另一方面，对于MIL-101（Cr）膜观察到最佳的CO2/N-2分离性能。与聚氨酯膜相比，获得了显著更大的CO2渗透性（约220%）。N-2渗透性也得到改善，导致与原始膜相同的选择性。PU/UiO-66（Zr）膜表现出增强的CO2渗透性，但伴随着选择性的降低，因为N-2通过膜的传输更有利。为了评估MOF在气体捕获中的效果，在不同温度下测定U10 -66（Zr）和MIL-101（Cr）的二氧化碳吸附容量。MIL-101（Cr）表现出最大的CO2吸附能力，这解释了用该MOF制备的膜的增加的气体渗透性。
Metal-Organic Frameworks (MOF) containing zirconium and chromium metals have been reported as gas materials for gas storage and separation, especially for CO2. The high selectivity of MOF can be exploited through their dispersion in a polymer matrix, producing mixed matrix membranes for different applications in gas separation and adsorption. This study reports the use of nanostructured mixed matrix membranes (MMM), produced by dispersion of the MOFs UiO-66 (Zr) and MIL-101 (Cr) in polyurethane for O-2/N-2 and CO2/N-2 gas separation. UiO-66 (Zr), MIL-101 (Cr) and composites comprising these particles were characterized by SEM, XRD, TGA and FTIR analyses, which indicated that the MOFS were successfully synthesized. Defect-free dense PU/UiO-66 (Zr) membranes were obtained, with increased selectivity due to the higher oxygen permeability. For the MIL-101 (Cr) membrane, no significant increases in oxygen selectivity and permeability were observed. On the other hand, best performance for CO2/N-2 separation was observed for the MIL-101 (Cr) membrane. A significantly greater CO2 permeability (around 220%) in comparison with polyurethane membrane was obtained. N-2 permeability was also improved, resulting in the same selectivity as the original membrane. PU/UiO-66 (Zr) membrane exhibited enhanced CO2 permeability but accompanied by a reduction in selectivity as N-2 transport through the membrane was more favored. To evaluate the effect of MOFs in gas capture, carbon dioxide adsorption capacity was determined at different temperatures for UiO-66 (Zr) and MIL-101 (Cr). The greatest CO2 adsorption capacity was exhibited by MIL-101 (Cr), which explains the increased gas permeability for the membrane prepared with this MOF.