Grzybek Paweł, Turczyn Roman, Dudek Gabriela
Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100 Gliwice, Poland.
Materials (Basel). 2021 Dec 12;14(24):7667. doi: 10.3390/ma14247667.
The process of ethanol dehydration via pervaporation was performed using alginate membranes filled with manganese dioxide and a mixed filler consisting of manganese dioxide on magnetite core MnO@FeO particles. The crystallization of manganese dioxide on magnetite nanoparticle surface resulted in a better dispersibility of this mixed filler in polymer matrix, with the preservation of the magnetic properties of magnetite. The prepared membranes were characterized by contact angle, degree of swelling and SEM microscopy measurements and correlated with their effectiveness in the pervaporative dehydration of ethanol. The results show a strong relation between filler properties and separation efficiency. The membranes filled with the mixed filler outperformed the membranes containing only neat oxide, exhibiting both higher flux and separation factor. The performance changed depending on filler content; thus, the presence of optimum filler loading was observed for the studied membranes. The best results were obtained for the alginate membrane filled with 7 wt.% of mixed filler MnO@FeO particles. For this membrane, the separation factor and flux equalled to 483 and 1.22 kg·m·h, respectively.
通过渗透蒸发进行乙醇脱水的过程是使用填充有二氧化锰的藻酸盐膜以及由磁铁矿核MnO@FeO颗粒上的二氧化锰组成的混合填料来进行的。二氧化锰在磁铁矿纳米颗粒表面的结晶导致这种混合填料在聚合物基质中具有更好的分散性，同时保留了磁铁矿的磁性。通过接触角、溶胀度和扫描电子显微镜测量对制备的膜进行表征，并将其与它们在乙醇渗透蒸发脱水方面的有效性相关联。结果表明填料性能与分离效率之间存在密切关系。填充混合填料的膜优于仅含有纯氧化物的膜，表现出更高的通量和分离因子。性能随填料含量而变化；因此，在所研究的膜中观察到存在最佳填料负载量。对于填充7 wt.%混合填料MnO@FeO颗粒的藻酸盐膜，获得了最佳结果。对于该膜，分离因子和通量分别等于483和1.22 kg·m·h。
