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

机译：通过氧化石墨烯膜进行质量抑制时热还原的歧义作用

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摘要

We report ambivalent rejection behavior of a graphene oxide membrane (GOM) having a reduced interlayer spacing. Ultrathin GOMs having a thickness of SO nm were fabricated using a vacuum filtration method followed by subjecting the samples to thermal reduction at 162 ℃. The interlayer spacing of GOMs was reduced by 1 A 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 A smaller interlayer spacing, indicating the dominant effect of surface charges on the GOM samples.
机译：我们报告了减少的层间间距的氧化石墨烯膜（GOM）的矛盾排斥行为。使用真空过滤方法制造厚度为SO nm的超薄GOM，然后在162℃下对样品进行热还原。与天然GOM相比，热还原时GOM的层间距减少了1A。在死角过滤仪器中使用具有三种不同类型电荷的染料测试了染料分子的排斥率。带有相反电荷的染料对还原的GOM的排斥率提高了高达99.7％，表明了物理筛分直径的主要作用。相反，在天然GOM的离子渗透的情况下，与层间间距小于1 A的GOM相比，观察到几种金属离子的排斥率更高，这表明表面电荷对GOM样品起主要作用。

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  • 来源
    《Environmental Science & Technology》 |2016年第18期|10024-10030|共7页
  • 作者

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

  • 作者单位

    School of Mechanical Engineering, Korea University, Seoul, Republic of Korea;

    School of Mechanical Engineering, Korea University, Seoul, Republic of Korea;

    Composite Laboratory, Agency for Defense Development, Daejeon, Republic of Korea;

    School of Mechanical Engineering, Korea University, Seoul, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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