• 文献标题:   Comparison of Chemical Cross-Linkers with Branched and Linear Molecular Structures for Stabilization of Graphene Oxide Membranes and Their Performance in Ethanol Dehydration
  • 文献类型:   Article
  • 作  者:   SURI A, CALZAVARINI L, STRUNCK AB, MAGNACCA G, BOFFA V
  • 作者关键词:  
  • 出版物名称:   INDUSTRIAL ENGINEERING CHEMISTRY RESEARCH
  • ISSN:   0888-5885
  • 通讯作者地址:   Aalborg Univ
  • 被引频次:   2
  • DOI:   10.1021/acs.iecr.9b01532
  • 出版年:   2019

▎ 摘  要

We report the fabrication of cross-linked graphene oxide (GO) membranes and their use for dehydration of ethanol by vapor permeation. Two compounds with branched structures, namely, a humic acid-like substance derived from urban waste and a synthetic hyperbranched polyol, were used as cross-linkers. Relatively small amounts of branched cross-linkers are able to stabilize GO membranes as compared with previously reported poly(ethylene glycol) (PEG). Supported cross-linked GO films were prepared by rod coating on polyethersulphone ultrafiltration membranes. The membranes showed a significantly higher permeance for water than for ethanol, and the water selectivity factor was found to increase with temperature in the range 30-60 degrees C, with the branched cross-linkers showing a higher water flux than that of PEG and similar to that of pristine GO, indicating lesser hindrance to water transport. The membranes were also able to dehydrate ethanol-water mixtures, producing retentates that had an ethanol fraction greater than the azeotropic composition.