Casadei Riccardo, Giacinti Baschetti Marco, Yoo Myung Jin, Park Ho Bum, Giorgini Loris
Department of Civil, Chemical, Environmental and Material Engineering (DICAM), University of Bologna, Via Terracini 28, 40131 Bologna, Italy.
Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea.
Membranes (Basel). 2020 Aug 15;10(8):188. doi: 10.3390/membranes10080188.
In this work, the behavior of new GO-based mixed matrix membranes was tested in view of their use as CO-selective membrane in post combustion carbon capture applications. In particular, the new materials were obtained by mixing of Pebax 2533 copolymer with different types of graphene oxide (GO). Pebax 2533 has indeed lower selectivity, but higher permeability than Pebax 1657, which is more commonly used for membranes, and it could therefore benefit from the addition of GO, which is endowed with very high selectivity of CO with respect to nitrogen. The mixed matrix membranes were obtained by adding different amounts of GO, from 0.02 to 1% by weight, to the commercial block copolymers. Porous graphene oxide (PGO) and GO functionalized with polyetheramine (PEAGO) were also considered in composites produced with similar procedure, with a loading of 0.02%wt. The obtained films were then characterized by using SEM, DSC, XPS analysis and permeability experiments. In particular, permeation tests with pure CO and N at 35°C and 1 bar of upstream pressure were conducted for the different materials to evaluate their separation performance. It has been discovered that adding these GO-based nanofillers to Pebax 2533 matrix does not improve the ideal selectivity of the material, but it allows to increase CO permeability when a low filler content, not higher than 0.02 wt%, is considered. Among the different types of GO, then, porous GO seems the most promising as it shows CO permeability in the order of 400 barrer (with an increase of about 10% with respect to the unloaded block copolymer), obtained without reducing the CO/N selectivity of the materials, which remained in the order of 25.
在这项工作中，鉴于新型氧化石墨烯基混合基质膜在燃烧后碳捕集应用中作为CO选择性膜的用途，对其性能进行了测试。具体而言，这些新材料是通过将Pebax 2533共聚物与不同类型的氧化石墨烯（GO）混合而制得的。实际上，Pebax 2533的选择性低于常用于膜的Pebax 1657，但渗透率更高，因此添加具有相对于氮气而言非常高的CO选择性的GO可能会使其受益。通过向商业嵌段共聚物中添加0.02至1重量％的不同量的GO来制备混合基质膜。在用类似方法制备的复合材料中，还考虑了多孔氧化石墨烯（PGO）和用聚醚胺（PEAGO）功能化的GO，其负载量为0.02％wt。然后使用扫描电子显微镜（SEM）、差示扫描量热法（DSC）、X射线光电子能谱分析（XPS）和渗透率实验对所得薄膜进行表征。具体而言，对不同材料在35°C和1巴上游压力下进行了纯CO和N的渗透测试，以评估它们的分离性能。已经发现，向Pebax 2533基质中添加这些基于GO的纳米填料并不能提高材料的理想选择性，但当考虑低填料含量（不高于0.02 wt％）时，可以提高CO渗透率。在不同类型的GO中，多孔GO似乎最有前途，因为它显示出的CO渗透率约为400巴耳（相对于未负载的嵌段共聚物增加了约10％），且未降低材料的CO/N选择性，该选择性保持在25左右。
