Selective permeation of water through angstrom-channel graphene membranes for bioethanol concentration

Xiaofang Chen, Shabin Mohammed, Guang Yang, Tianyue Qian, Yu Chen, Hongyu Ma, Zongli Xie, Xiwang Zhang, George P. Simon, Huanting Wang

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Graphene-based laminate membranes have been theoretically predicted to selectively transport ethanol from ethanol–water solution while blocking water. Here, robust angstrom-channel graphene membranes (ACGMs) fabricated by intercalating carbon sheets derived from chitosan into thermally reduced graphene oxide (GO) sheets are reported. ACGMs with robust and continuous slit-shaped pores (an average pore size of 3.9 Å) are investigated for the dehydration of ethanol. Surprisingly, only water permeates through ACGMs in the presence of aqueous ethanol solution. For the water-ethanol mixture containing 90 wt% ethanol, water can selectively permeate through ACGMs with a water flux of 63.8 ± 3.2 kg m−2 h−1 at 20 °C and 389.1 ± 19.4 kg m−2 h−1 at 60 °C, which are over two orders of magnitude higher than those of conventional pervaporation membranes. This means that ACGMs can effectively operate at room temperature. Moreover, the ethanol can be fast concentrated to high purity (up to 99.9 wt%). Therefore, ACGMs are very promising for production of bioethanol with high efficiency, thus improving its process sustainability.

Original languageEnglish
Article number2002320
Number of pages7
JournalAdvanced Materials
Volume33
Issue number32
DOIs
Publication statusPublished - 20 Aug 2020

Keywords

  • angstrom channels
  • bioethanol dehydration
  • carbonization
  • graphene membranes

Cite this