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首页> 外文期刊>RSC Advances >Concurrent and dual N-doping of graphene/ZnO nanocomposites for enhanced Cr(vi) photoreduction activity under visible-light irradiation
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Concurrent and dual N-doping of graphene/ZnO nanocomposites for enhanced Cr(vi) photoreduction activity under visible-light irradiation

机译：石墨烯/ ZnO纳米复合材料的同时和双n掺杂用于增强的CR（VI）光电照射下的CR（VI）光电辐射活性

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摘要

Simultaneous and dual N-doping of two components in reduced graphene oxide/ZnO nanocomposites were successfully achieved by thermally annealing a GO/Zn(HCO3)(2)precursor in an NH(3)atmosphere. In this facile preparative procedure, NH(3)was used not only as the reagent forin situreduction of GO but also as the source for N-doping. Detailed characterizations showed that the nitrogen element was successfully and simultaneously incorporated into the crystal lattice of ZnO and graphene phases in the composites and the formation of oxygen vacancies was also achieved. The photocatalytic tests indicated that N-doping of graphene/ZnO (NG/NZO) nanocomposites exhibited the higher Cr(vi) photoreduction activity than graphene/ZnO, virgin N-doped ZnO (NZO) and the sample preparedviasimple physically mixing. The mechanistic study demonstrated that the remarkable photocatalytic activity of NG/NZO photocatalysts was due to the synergistic effect of simultaneously N-doping two phases in the composites and the existence of oxygen vacancies, and mainly included the increased electrical conductivity of N-doped graphene (NG), the expansion of visible light harvesting capability of NZO and the effective separation of electron-hole pairs of the oxygen vacancies.
机译：通过在NH（3）气氛中的GO / Zn（HCO 3）（2）前体进行热退火，成功地实现了两种转化的石墨烯氧化物/ ZnO纳米复合材料中的两种组分的同时和双N掺杂。在这种容易的制备方法中，NH（3）不仅用于转移的试剂，而且作为N-掺杂的来源。详细表征表明，氮素元素成功且同时掺入复合材料中的ZnO和石墨烯相的晶格中，并且还实现了氧空位的形成。光催化试验表明石墨烯/ ZnO（Ng / NZO）纳米复合材料的N掺杂表现出比石墨烯/ ZnO，原始N掺杂的ZnO（NZO）和物理混合样品制备的ZnO ZnO（NZO）的较高的Cr（VI）光电诱导活性。机械研究表明，Ng / NZO光催化剂的显着光催化活性是由于同时N-掺杂复合材料中的两个相的协同效果和氧空位的存在，主要包括增加N-掺杂石墨烯的导电率增加（ NG），扩大NZO的可见光收集能力和电子空穴对氧空穴的有效分离。

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  • 来源
    《RSC Advances》 |2020年第51期|共8页
  • 作者

    Jia Wen; Yuan Xiaoya;

  • 作者单位

    Chongqing Jiaotong Univ Coll Mat Sci &

    Engn Chongqing 400074 Peoples R China;

    Chongqing Jiaotong Univ Coll Mat Sci &

    Engn Chongqing 400074 Peoples R China;

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