https://scholars.lib.ntu.edu.tw/handle/123456789/577197
標題: | Improved performance of nanocomposite polyimide membranes for pervaporation fabricated by embedding spirobisindane structure-functionalized graphene oxide | 作者: | Lee J.-Y Zhan J.-Y Ang M.B.M.Y Yeh S.-C Tsai H.-A Jeng R.-J. RU-JONG JENG |
關鍵字: | Dehydration; Evaporation; Graphene; Nanocomposites; Pervaporation; Positron annihilation spectroscopy; Dehydration performance; Functionalized graphene; Membrane performance; Nano-composite membranes; Polymers of intrinsic microporosities; Polysulfone supports; Positron annihilation lifetime spectroscopy; Structural characteristics; Membranes | 公開日期: | 2021 | 卷: | 265 | 來源出版物: | Separation and Purification Technology | 摘要: | In this study, spirobisindane-functionalized graphene oxide (SFGO)/polyimide (Matrimid? 5218, i.e. M) solutions are spin-coated onto a polysulfone support to produce SFGO@M nanocomposite membranes for alcohol dehydration by pervaporation. Compounds 3,3,3′,3′-tetramethyl-1,1′-spirobisindane-6,6′-diol (TSD) and 4,4′-((3,3,3′,3′-tetramethyl-2,2′,3,3′-tetrahydro-1,1′-spirobi[indene]-6,6′-diyl)bis(oxy))dianiline (TTSD) are synthesized based on a conversion reaction from bisphenol A (BPA). Both TSD and TTSD contain spirobisindane structure, which is inspired by the structural unit from polymers of intrinsic microporosity. The fine structural characteristics of SFGO@M membranes are evaluated using positron annihilation lifetime spectroscopy. The membrane free volume increases in the following order: M < GO@M < BPA-GO@M < TSD-GO@M < TTSD-GO@M. These results reveal that SFGO affected the fine structural characteristics of membranes in a more significant manner when compared with GO@M and BPA-GO@M. Moreover, TSD-GO@M and TTSD-GO@M exhibit different levels of dehydration performance when tested on different alcohol feed solutions. After TTSD modification on GO, the membrane performance increased from 619.3 ± 124.0 g?m-2h?1 for the pristine sample, to 915.5 ± 44.8 g?m-2h?1 for TTSD-GO@M, and the water concentration in the permeate is maintained as high as 99 wt%. Furthermore, the modified membranes are stable under broad operating conditions with high potential for long-term use. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101300033&doi=10.1016%2fj.seppur.2021.118470&partnerID=40&md5=713d3656e4bdd14ff286d2ab5888cc1c https://scholars.lib.ntu.edu.tw/handle/123456789/577197 |
ISSN: | 13835866 | DOI: | 10.1016/j.seppur.2021.118470 |
顯示於: | 高分子科學與工程學研究所 |
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