Si Zhihao, Hu Song, Cai Di, Qin Peiyong, Xu Qinghong
Beijing Key Laboratory of Bioprocess, Beijing University of Chemical Technology Beijing 100029 China
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology Beijing 100029 China
RSC Adv. 2018 Jan 30;8(10):5127-5135. doi: 10.1039/c7ra11043j. eCollection 2018 Jan 29.
In the current work, MCM-41/polydimethylsiloxane (PDMS) mixed matrix membrane (MMM) was prepared for effective -butanol pervaporation from a model aqueous solution. In order to improve the compatibility between MCM-41 and PDMS, different types of silane coupling agents including -propyltrimethoxysilane (PTMS), -octyltrimethoxysilane (OTMS), -dodecyltrimethoxysilane (DTMS) and -hexadecyltrimethoxysilane (HDTMS) were used to modify the MCM-41. The results showed that the highest -butanol separation performance was achieved by bonding 20 wt% of PTMS-modified MCM-41 with PDMS. Under these conditions, total flux of 1476 g m h was obtained when separating a 1.5 wt% -butanol aqueous solution at 55 °C. The total flux increased by nearly 40% compared to the pure PDMS membrane with no obvious changes of the -butanol separation factor at the same time. The curing process of the casting solution was also significantly improved after MCM-41 modification.
在当前工作中，制备了MCM - 41/聚二甲基硅氧烷（PDMS）混合基质膜（MMM），用于从模型水溶液中进行高效正丁醇渗透汽化。为了提高MCM - 41与PDMS之间的相容性，使用了不同类型的硅烷偶联剂，包括丙基三甲氧基硅烷（PTMS）、辛基三甲氧基硅烷（OTMS）、十二烷基三甲氧基硅烷（DTMS）和十六烷基三甲氧基硅烷（HDTMS）对MCM - 41进行改性。结果表明，通过将20 wt%的PTMS改性MCM - 41与PDMS结合，可实现最高的正丁醇分离性能。在此条件下，在55℃分离1.5 wt%正丁醇水溶液时，总通量达到1476 g m⁻² h⁻¹。与纯PDMS膜相比，总通量增加了近40%，同时正丁醇分离因子没有明显变化。MCM - 41改性后，铸膜液的固化过程也得到了显著改善。
