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Mechanism of a green graphene oxide reduction with reusable potassium carbonate

机译：用可重复使用的碳酸钾降低绿色石墨烯氧化物的机制

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摘要

A green method for the deoxygenation of graphene oxide (GO) was developed using K2CO3 as a reusable reduction agent. The size and thickness of the reduced GO are less than 1 mm and around 0.85 nm, respectively. Carbon dioxide is the only byproduct during this process. The reduction mechanism of the graphene oxide includes two reduction steps. On the one hand, ionic oxygen generated from the electrochemical reaction between hydroxyl ions and oxygen in the presence of K2CO3 reacts with carbonyl groups attached to the GO layers at 50 degrees C. On the other hand, ionic oxygen attacks hydroxyl and epoxide groups, which become carbonyl groups and then are converted to carbon dioxide by K2CO3 at 90 degrees C. These oxygenous groups are finally converted to CO2 from graphene layers, leading to the formation of graphene sheets. Headspace solid-phase microextraction and gas chromatographymass spectrometry detected the existence of n-dodecanal and 4-ethylbenzoic acid cyclopentyl ester during the reduction, suggesting that oxygen functional groups on the GO layers are not only aligned, but randomly dispersed in some areas based on the proposed mechanism.
机译：使用K2CO3作为可重复使用的还原剂，开发了石墨烯氧化物（GO）的脱氧（GO）的绿色方法。降低的尺寸和厚度分别小于1mm和约0.85nm。二氧化碳是此过程中唯一的副产品。氧化石墨烯的还原机理包括两个还原步骤。一方面，在K 2 CO 3存在下从羟基离子和氧之间的电化学反应产生的离子氧与在50℃下与去层连接的羰基反应。另一方面，离子氧气发作羟基和环氧基团成为羰基，然后在90℃下通过K 2 CO 3转化为二氧化碳。这些含量最终从石墨烯层转化为CO 2，导致石墨烯片的形成。顶空固相微萃取和气相色谱 - 检测到在减少过程中存在N-十二烷醛和4-乙基苯甲酸环戊基酯的存在，表明GO层上的氧官能团不仅对准，而且基于以下的某些地区随机分散提出的机制。

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  • 来源
    《RSC Advances》 |2015年第16期|共7页
  • 作者

    He Dongning; Peng Zheng; Gong Wei; Luo Yongyue; Zhao Pengfei; Kong Lingxue;

  • 作者单位

    Chinese Acad Trop Agr Sci Chinese Agr Minist Agr Prod Proc Res Inst Key Lab Trop Crop Prod Proc Zhanjiang 524001 Peoples R China;

    Chinese Acad Trop Agr Sci Chinese Agr Minist Agr Prod Proc Res Inst Key Lab Trop Crop Prod Proc Zhanjiang 524001 Peoples R China;

    Chinese Acad Trop Agr Sci Chinese Agr Minist Agr Prod Proc Res Inst Key Lab Trop Crop Prod Proc Zhanjiang 524001 Peoples R China;

    Chinese Acad Trop Agr Sci Chinese Agr Minist Agr Prod Proc Res Inst Key Lab Trop Crop Prod Proc Zhanjiang 524001 Peoples R China;

    Chinese Acad Trop Agr Sci Chinese Agr Minist Agr Prod Proc Res Inst Key Lab Trop Crop Prod Proc Zhanjiang 524001 Peoples R China;

    Deakin Univ Inst Frontier Mat Waurn Ponds Vic 3216 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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