• 文献标题:   2D Heterostructured Nanofluidic Channels for Enhanced Desalination Performance of Graphene Oxide Membranes
  • 文献类型:   Article
  • 作  者:   WU YY, FU CF, HUANG Q, ZHANG PP, CUI P, RAN J, YANG JL, XU TW
  • 作者关键词:   membrane, twodimensional, heterostructured channel, graphene oxide, desalination
  • 出版物名称:   ACS NANO
  • ISSN:   1936-0851 EI 1936-086X
  • 通讯作者地址:  
  • 被引频次:   65
  • DOI:   10.1021/acsnano.1c01105 EA APR 2021
  • 出版年:   2021

▎ 摘  要

The two-dimensional (2D) lamellar membrane assembly technique shows substantial potential for sustainable desalination applications. However, the relatively wide and size-variable channels of 2D membranes in aqueous solution result in inferior salt rejections. Here we show the establishment of nanofluidic heterostructured channels in graphene oxide (GO) membranes by adding g-C3N4 sheets into GO interlamination. Benefiting from the presence of stable and sub-nanometer wide (0.42 nm) GO/g-C3N4 channels, the GO/g-C3N4 membrane exhibits salt rejections of similar to 90% with water permeances of above 30 L h(-1) m(-2) bar(-1), while the pure GO membrane only has salt rejections of below 30% accompanied by water permeances of below 4 L h(-1) m(-2) bar(-1). Combining experimental and theoretical investigations, size exclusion has proved to be the dominating mechanism for high rejections, and the ultralow friction water flow along g-C3N4 sheets is responsible for permeation enhancements. Importantly, the GO/g-C3N4 membrane shows promising long-term, antioxidation, and antipressure stability.