Ambivalent Effect of Thermal Reduction in Mass Rejection through Graphene Oxide Membrane

Jin Hyeok Jang, Ju Yeon Woo, Jaeyeol Lee, Chang-Soo Han

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We report ambivalent rejection behavior of a graphene oxide membrane (GOM) having a reduced interlayer spacing. Ultrathin GOMs having a thickness of 50 nm were fabricated using a vacuum filtration method followed by subjecting the samples to thermal reduction at 162 °C. The interlayer spacing of GOMs was reduced by 1 Å on thermal reduction as compared with that of the natural GOMs. The rejection rate with dye molecules was tested using dyes having three different types of charges in a dead-end filtration instrument. Rejection rate of the reduced GOM with the dyes having an opposite charge was improved up to 99.7%, indicating the dominant effect of the physical sieving diameter. In contrast, in the case of ion permeation of natural GOM, a higher rejection rate for several metal ions was observed as compared with that of GOMs having 1 Å smaller interlayer spacing, indicating the dominant effect of surface charges on the GOM samples.

Original languageEnglish
Pages (from-to)10024-10030
Number of pages7
JournalEnvironmental Science and Technology
Issue number18
Publication statusPublished - 2016 Sep 20


ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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