期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 50, 期 18, 页码 10024-10030出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b02834
关键词
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资金
- Defense Acquisition Program Administration
- Agency for Defense Development
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning (MSIP) in Korea [2015-01004751]
- Nano Material Fundamental Research through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT, and Future Planning (MSIP) in Korea [2012M3A7B4049863]
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 degrees C. The interlayer spacing of GOMs was reduced by 1 angstrom 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 angstrom smaller interlayer spacing, indicating the dominant effect of surface charges on the GOM samples.
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