Dmitrenko Mariia, Mikhailovskaya Olga, Dubovenko Roman, Kuzminova Anna, Myznikov Danila, Mazur Anton, Semenov Konstantin, Rusalev Yury, Soldatov Alexander, Ermakov Sergey, Penkova Anastasia
St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia.
Pavlov First Saint Petersburg State Medical University, L'va Tolstogo ulitsa 6-8, St. Petersburg 197022, Russia.
Polymers (Basel). 2024 Apr 25;16(9):1206. doi: 10.3390/polym16091206.
Pervaporation is considered the most promising technology for dehydration of bioalcohols, attracting increasing attention as a renewable energy source. In this regard, the development of stable and effective membranes is required. In this study, highly efficient membranes for the enhanced pervaporation dehydration of ethanol were developed by modification of sodium alginate (SA) with a polyethylenimine (PEI) forming polyelectrolyte complex (PEC) and graphene oxide (GO). The effect of modifications with GO or/and PEI on the structure, physicochemical, and transport characteristics of dense membranes was studied. The formation of a PEC by ionic cross-linking and its interaction with GO led to changes in membrane structure, confirmed by spectroscopic and microscopic methods. The physicochemical properties of membranes were investigated by a thermogravimetric analysis, a differential scanning calorimetry, and measurements of contact angles. The theoretical consideration using computational methods showed favorable hydrogen bonding interactions between GO, PEI, and water, which caused improved membrane performance. To increase permeability, supported membranes without treatment and cross-linked were developed by the deposition of a thin dense layer from the optimal PEC/GO (2.5%) composite onto a developed porous substrate from polyacrylonitrile. The cross-linked supported membrane demonstrated more than two times increased permeation flux, higher selectivity (above 99.7 wt.% water in the permeate) and stability for separating diluted mixtures compared to the dense pristine SA membrane.
渗透汽化被认为是生物醇脱水最具前景的技术，作为一种可再生能源正受到越来越多的关注。在这方面，需要开发稳定且有效的膜。在本研究中，通过用聚乙烯亚胺（PEI）对海藻酸钠（SA）进行改性以形成聚电解质复合物（PEC）和氧化石墨烯（GO），制备了用于增强乙醇渗透汽化脱水的高效膜。研究了用GO或/和PEI改性对致密膜的结构、物理化学和传输特性的影响。通过光谱和显微镜方法证实，离子交联形成PEC及其与GO的相互作用导致了膜结构的变化。通过热重分析、差示扫描量热法和接触角测量对膜的物理化学性质进行了研究。使用计算方法进行的理论分析表明，GO、PEI和水之间存在良好的氢键相互作用，这导致膜性能得到改善。为了提高渗透率，通过将最佳PEC/GO（2.5%）复合材料的致密薄层沉积到由聚丙烯腈制成的多孔基材上，制备了未经处理和交联的支撑膜。与致密的原始SA膜相比，交联支撑膜的渗透通量增加了两倍多，选择性更高（渗透物中水的含量高于99.7 wt.%），并且在分离稀释混合物时具有稳定性。
