期刊
CHEMICAL ENGINEERING JOURNAL
卷 353, 期 -, 页码 689-698出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.07.156
关键词
Organic solvent nanofiltration (OSN); Flat sheet membranes; Dye removal; Functionalized polymers of intrinsic microporosity (PIMs); Cross-linking
资金
- Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Program [1301-IRIS-60, R-279-000-451-279]
- Singapore National Research Foundation [NRF-CRP14-2014-01, R-279-000-466-281]
A nanometric functionalized polymer of intrinsic microporosity (PIM), i.e., thioamide-PIM-1 (TPIM), has been synthesized and applied for dyes removal from ethanol and acetone solutions for the first time. The presence of thioamide groups in TPIM provides the anchor to further cross-link the polymer with trimesoyl chloride (TMC) so that the resultant membranes not only have a tight pore size (i.e., small free volume), but also have better chemical stability and rejection. The organic solvent nanofiltration (OSN) membranes were prepared by depositing a thin TPIM layer on top of cross-linked P84 polyimide substrates by means of spin coating. With the novel TMC modification, the resultant multilayer membranes have a rejection reaching 90% to remazol brilliant blue R (Mw: 627 g mol(-1)) with a pure ethanol permeance of 3.4 Lm(-2) bar(-1) h(-1). It also has an impressively high acetone permeance of 12.42 Lm(-2) bar(-1) h(-1) with a rejection of 97% to rose bengal (Mw: 974 Da). This study may open up new insights and strategies to modify other PIMs for OSN applications.
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