Performance enhancement of a polydimethylsiloxane membrane for effective n-butanol pervaporation by bonding multi-silyl-functional MCM-41.
Performance enhancement of a polydimethylsiloxane membrane for effective n-butanol pervaporation by bonding multi-silyl-functional MCM-41.
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通过键合多甲硅烷基官能团 MCM-41 增强聚二甲基硅氧烷膜的性能，以实现有效的正丁醇全蒸发
DOI：
10.1039/c7ra11043j
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发表时间：
2018-01-29
期刊：
影响因子：
3.9
通讯作者：
Xu Q
中科院分区：
文献类型：
--
作者：
Si Z;Hu S;Cai D;Qin P;Xu Q
本文以正丁醇为模型水溶液，制备了MCM-41/PDMS混合基质膜（MMM）。为了改善MCM-41与PDMS之间的相容性，采用正丙基三甲氧基硅烷（PTMS）、正辛基三甲氧基硅烷（OTMS）、正十二烷基三甲氧基硅烷（DTMS）和正十六烷基三甲氧基硅烷（HDTMS）对MCM-41进行改性。结果表明，当PDMS改性MCM-41的质量分数为20%时，正丁醇的分离性能最好。在这些条件下，当在55 °C下分离1.5重量%正丁醇水溶液时，获得1476 g m-2 h-1的总通量。与纯PDMS膜相比，总通量提高了近40%，同时对正丁醇的分离因子无明显影响。MCM-41改性后铸膜液的固化过程也得到了明显改善。通过键合多硅基MCM-41，聚二甲基硅氧烷膜的相容性和总通量得到显著改善。
In the current work, MCM-41/polydimethylsiloxane (PDMS) mixed matrix membrane (MMM) was prepared for effective n-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 n-propyltrimethoxysilane (PTMS), n-octyltrimethoxysilane (OTMS), n-dodecyltrimethoxysilane (DTMS) and n-hexadecyltrimethoxysilane (HDTMS) were used to modify the MCM-41. The results showed that the highest n-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−2 h−1 was obtained when separating a 1.5 wt% n-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 n-butanol separation factor at the same time. The curing process of the casting solution was also significantly improved after MCM-41 modification. The compatibility and total flux of a polydimethylsiloxane membrane were significantly improved by bonding multi-silyl-functional MCM-41.
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