Dmitrenko Mariia, Zolotarev Andrey, Plisko Tatiana, Burts Katsiaryna, Liamin Vladislav, Bildyukevich Alexandr, Ermakov Sergey, Penkova Anastasia
St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia.
Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, 13 Surganov Str., 220072 Minsk, Belarus.
Membranes (Basel). 2020 Jul 16;10(7):153. doi: 10.3390/membranes10070153.
The aim of the study is to improve the performance of thin-film composite (TFC) membranes with a thin selective layer based on chitosan (CS) via different approaches by: (1) varying the concentration of the CS solution; (2) changing the porosity of substrates from polyacrylonitrile (PAN); (3) deposition of the additional ultrathin layers on the surface of the selective CS layer using interfacial polymerization and layer-by-layer assembly. The developed membranes were characterized by different methods of analyses (SEM and AFM, IR spectroscopy, measuring of water contact angles and porosity). The transport characteristics of the developed TFC membranes were studied in pervaporation separation of isopropanol/water mixtures. It was found that the application of the most porous PAN-4 substrate with combination of formation of an additional polyamide selective layer by interfacial polymerization on the surface of a dense selective CS layer with the subsequent layer-by-layer deposition of five bilayers of poly (sodium 4-styrenesulfonate)/CS polyelectrolyte pair led to the significant improvement of permeance and high selectivity for the entire concentration feed range. Thus, for TFC membrane on the PAN-4 substrate the optimal transport characteristics in pervaporation dehydration of isopropanol (12-90 wt.% water) were achieved: 0.22-1.30 kg/(mh), 99.9 wt.% water in the permeate.
本研究的目的是通过不同方法提高基于壳聚糖（CS）的具有薄选择层的复合薄膜（TFC）膜的性能，具体方法如下：（1）改变CS溶液的浓度；（2）改变聚丙烯腈（PAN）基材的孔隙率；（3）使用界面聚合和层层组装在选择性CS层表面沉积额外的超薄层。通过不同的分析方法（扫描电子显微镜和原子力显微镜、红外光谱、测量水接触角和孔隙率）对所制备的膜进行表征。在异丙醇/水混合物的渗透蒸发分离中研究了所制备的TFC膜的传输特性。结果发现，应用孔隙率最高的PAN-4基材，在致密的选择性CS层表面通过界面聚合形成额外的聚酰胺选择层，随后层层沉积五层聚（4-苯乙烯磺酸钠）/CS聚电解质对，可显著提高整个进料浓度范围内的渗透率和选择性。因此，对于PAN-4基材上的TFC膜，在异丙醇渗透蒸发脱水（水含量为12-90 wt.%）中实现了最佳传输特性：0.22-1.30 kg/(mh)，渗透物中水含量为99.9 wt.%。
