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首页> 外文期刊>RSC Advances >Facile electrochemical assisted synthesis of ZnO/graphene nanosheets with enhanced photocatalytic activity
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Facile electrochemical assisted synthesis of ZnO/graphene nanosheets with enhanced photocatalytic activity

机译：具有增强的光催化活性的ZnO /石墨烯纳米片的容易电化学辅助合成

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摘要

In the present study, an electrochemical exfoliation technique was used to synthesize a series of zinc oxide/graphene (ZnO/Gr) nanocomposites using different concentrations of zinc nitrate in an electrolyte solution. The prepared ZnO/Gr nanocomposites were characterized using a range of analytical techniques and evaluated further for their photocatalytic activity over methyl orange (MO) and rhodamine B (RhB) under UV light. Scanning electron microscopy and transmission electron microscopy showed that the ZnO/Gr nanocomposite synthesized using 7 mmol of zinc nitrate exhibited a sheet-like morphology with a uniform decoration of ZnO nanoparticles over the graphene sheets, as well as the maximum photodegradation capacity for MO (>96%) and RhB (>89%) among the composites prepared. The loading of graphene was found to be crucial for deciding the enhancement in the photocatalytic activity, and resulted in a remarkable improvement in photocatalytic activity (similar to 7 times for MO and similar to 2 times for RhB) over bare ZnO. Photoluminescence spectroscopic analysis revealed the improved separation of electron-hole pairs with the graphene loading, which is mainly responsible for the enhanced photocatalytic activity. The present work possesses the advantage of in situ synthesis of few layered less defective graphene/ZnO composites with enhanced photocatalytic activity.
机译：在本研究中，使用电化学剥离技术在电解质溶液中使用不同浓度的硝酸锌合成一系列氧化锌/石墨烯（ZnO / Gr）纳米复合材料。使用一系列分析技术表征制备的ZnO / GR纳米复合材料，并在紫外光下进一步评价它们在甲基橙（Mo）和罗丹明B（RHB）上的光催化活性。扫描电子显微镜和透射电子显微镜表明，使用7mmol硝酸锌合成的ZnO / GR纳米复合材料表现出与石墨烯片上的ZnO纳米颗粒的均匀装饰的片状形态，以及Mo的最大光降解能力（>编制复合材料中的96％）和RHB（> 89％）。发现石墨烯的加载对于决定光催化活性的增强至关重要，并导致光催化活性的显着改善（类似于MO的7次，并且在rhB的2次上的rHB的2次）在裸ZnO上。光致发光光谱分析显示了具有石墨烯负载的电子空穴对的改进分离，主要负责增强的光催化活性。本作本作的优点是原位合成少量缺陷的石墨烯/ ZnO复合材料，具有增强的光催化活性。

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  • 来源
    《RSC Advances》 |2015年第118期|共10页
  • 作者

    Sawant Sandesh Y.; Cho Moo Hwan;

  • 作者单位

    Yeungnam Univ Sch Chem Engn Gyongsan 712749 Gyeongbuk South Korea;

    Yeungnam Univ Sch Chem Engn Gyongsan 712749 Gyeongbuk South Korea;

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