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首页> 外文期刊>Materials Research Bulletin >Flower-like nanostructure MNb_2O_6 (M = Mn, Zn) with high surface area: Hydrothermal synthesis and enhanced photocatalytic performance
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Flower-like nanostructure MNb_2O_6 (M = Mn, Zn) with high surface area: Hydrothermal synthesis and enhanced photocatalytic performance

机译：具有高表面积的花状纳米结构MNb_2O_6（M = Mn，Zn）：水热合成和增强的光催化性能

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摘要

Nano-scaled MNb_2O_6 (M = Mn, Zn) was successfully synthesized via a two-step hydrothermal method. It is important to control the exact pH of the reaction solution in order to obtain pure products. The as-prepared samples both crystallize in the columbite structure. Interestingly, the products possess a flower-like morphology in a pseudo-six-fold symmetry, which is in fact arrayed by two-dimensional nanosheets. Their surface areas (51 m~2/g for MnNb_2O_6 and 103 m~2/g for ZnNb_2O_6) are about 25-50 times of those prepared by solid state reaction. UV-vis diffuse reflectance spectra show the nano-scaled sample has a stronger absorption and a narrower band gap than its bulk form. The estimated band gap energies are 2.70 eV (MnNb_2O_6) and 3.77 eV (ZnNb_2O_6), respectively. The nano-scaled ZnNb_2O_6 exhibits a double enhancement of photocatalytic activity in the decolorization of methylene blue than bulk ZnNb_2O_6.
机译：通过两步水热法成功合成了纳米级的MNb_2O_6（M = Mn，Zn）。为了获得纯净的产品，控制反应溶液的精确pH值很重要。所制备的样品均在钴矿结构中结晶。有趣的是，产品具有伪六折对称的花状形态，实际上是由二维纳米片排列而成的。它们的表面积（对于MnNb_2O_6为51 m〜2 / g，对于ZnNb_2O_6为103 m〜2 / g）约为固态反应制备表面积的25-50倍。紫外可见漫反射光谱表明，纳米级样品比其体型具有更强的吸收能力和更窄的带隙。估计的带隙能量分别为2.70 eV（MnNb_2O_6）和3.77 eV（ZnNb_2O_6）。纳米级ZnNb_2O_6在亚甲基蓝脱色中比本体ZnNb_2O_6表现出双倍的光催化活性。

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  • 来源
    《Materials Research Bulletin》 |2014年第3期|271-276|共6页
  • 作者

    Xue Huang; Yan Jing; Jia Yang; Jing Ju; Rihong Cong; Wenliang Gao; Tao Yang;

  • 作者单位

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Nanostructures; B. Chemical synthesis; C. Electron microscopy; D. Catalytic properties;

    机译：A.纳米结构;B.化学合成;C.电子显微镜;D.催化性能;

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