National Energy R&D Center for Biorefinery, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology Co., Ltd., Shanghai, 201208, P. R. China.
Macromol Rapid Commun. 2024 Oct;45(20):e2400384. doi: 10.1002/marc.202400384. Epub 2024 Aug 3.
A high-quality filler within mixed matrix membranes, coupled with uniform dispersity, endows a high-efficiency transfer pathway for the significant improvement on separation performance. In this work, a zeolite-typed MCM-22 filler is reported that is doped into polydimethylsiloxane (PDMS) matrix by ultrafast photo-curing technique. The unique structure of nanosheets assembly layer by layer endows the continuous transfer channels towards penetrate molecules because of the inter-connective nanosheets within PDMS matrix. Furthermore, an ultrafast freezing effect produced by fast photo-curing is used to overcome the key issue, namely filler aggregation, and further eliminates defects. When pervaporative separating a 5 wt% ethanol aqueous solution, the resulting MCM-22/PDMS membrane exhibits an excellent membrane flux of 1486 g m h with an ethanol separation factor of 10.2. Considering a biobased route for ethanol production, the gas stripping and vapor permeation through this membrane also shows a great enrichment performance, and the concentrated ethanol is up to 65.6 wt%. Overall, this MCM-22/PDMS membrane shows a high separation ability for ethanol benefited from a unique structure deign of fillers and ultrafast curing speed of PDMS, and has a great potential for bioethanol separation from cellulosic ethanol fermentation.
在混合基质膜中使用高质量的填充剂，并使其具有均匀的分散性，为高效传递途径的形成提供了条件，从而显著提高分离性能。在这项工作中，报告了一种沸石型 MCM-22 填充剂，它通过超快光固化技术掺杂到聚二甲基硅氧烷（PDMS）基质中。由于 PDMS 基质中的纳米片相互连接，纳米片层层组装的独特结构为穿透分子提供了连续的传递通道。此外，超快光固化产生的超快冷冻效应用于克服关键问题，即填充剂聚集，并进一步消除缺陷。在渗透蒸发分离 5wt%乙醇水溶液时，所得的 MCM-22/PDMS 膜表现出 1486g m h 的优异膜通量和 10.2 的乙醇分离因子。考虑到生物基乙醇生产的途径，通过该膜的气体汽提和蒸汽渗透也表现出很好的浓缩性能，浓缩乙醇高达 65.6wt%。总的来说，由于填充剂的独特结构设计和 PDMS 的超快固化速度，这种 MCM-22/PDMS 膜对乙醇具有很高的分离能力，在从纤维素乙醇发酵中分离生物乙醇方面具有很大的潜力。
