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首页> 外文期刊>Materials Research Bulletin >Lanthanide stannate pyrochlores Ln_2Sn_2O_7 (Ln = Nd, Sm, Eu, Gd, Er, Yb) nanocrystals: Synthesis, characterization, and photocatalytic properties
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Lanthanide stannate pyrochlores Ln_2Sn_2O_7 (Ln = Nd, Sm, Eu, Gd, Er, Yb) nanocrystals: Synthesis, characterization, and photocatalytic properties

机译：镧系锡酸盐烧绿石Ln_2Sn_2O_7（Ln = Nd，Sm，Eu，Gd，Er，Yb）纳米晶体：合成，表征和光催化性能

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摘要

A series of lanthanide stannate pyrochlores Ln_2Sn_2O_7 (Ln = Nd, Sm, Eu, Gd, Er, Yb) nanocrystals have been successfully synthesized via a facile hydrothermal route. With the decrease of Ln~(3+) radius, the light absorption edge of the as-prepared Ln_2Sn_2O_7 shows a red shift from Nd~(3+) to Yb~(3+). Their photocatalytic activities are found to be improved with the decrease of Ln~(3+) radius. However, the photocatalytic activity of Yb_2Sn_2O_7 is a little lower than Er_2Sn_2O_7, although the Yb~(3+) radius is smaller than Er~(3+), which may be attributed to the full-filled electronic configuration (4f~(14)) of surface Yb~(2+) intermediates (formed by Yb~(3+) trapping a photo-excited electron). The crystallite size and surface area play the most important role in determining the activities. Furthermore, hydroxyl radicals are detected to be the major reactive species during the photo-degradation process. Our findings provide insights in the fabrication of highly efficient stannate photocatalysts, thus enlarging the family of photocatalysts available.
机译：已经通过一种简便的水热途径成功地合成了一系列镧系锡酸盐烧绿石Ln_2Sn_2O_7（Ln = Nd，Sm，Eu，Gd，Er，Yb）纳米晶体。随着Ln〜（3+）半径的减小，所制备的Ln_2Sn_2O_7的光吸收边缘显示出从Nd〜（3+）到Yb〜（3+）的红移。发现它们的光催化活性随着Ln〜（3+）半径的减小而提高。然而，尽管Yb〜（3+）半径小于Er〜（3+），但Yb_2Sn_2O_7的光催化活性比Er_2Sn_2O_7略低，这可能归因于充满电子结构（4f〜（14）表面的Yb〜（2+）中间产物（由Yb〜（3+）捕获光激发电子而形成）。微晶尺寸和表面积在确定活性中起着最重要的作用。此外，在光降解过程中，羟自由基是主要的反应物种。我们的发现为高效锡酸盐光催化剂的制备提供了见识，从而扩大了可用的光催化剂家族。

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  • 来源
    《Materials Research Bulletin》 |2014年第8期|86-91|共6页
  • 作者

    Wanjun Wang; Shijing Liang; Jinhong Bi; Jimmy C. Yu; Po Keung Wong; Ling Wu;

  • 作者单位

    State Key Laboratory of Photocatalysis on Energy and Environment, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, China,Department of Chemistry and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China;

    State Key Laboratory of Photocatalysis on Energy and Environment, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, China;

    State Key Laboratory of Photocatalysis on Energy and Environment, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, China;

    Department of Chemistry and Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China;

    School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China;

    State Key Laboratory of Photocatalysis on Energy and Environment, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, 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. Inorganic compounds; B. Chemical synthesis; C. Electron microscopy; D. Catalytic properties;

    机译：A.无机化合物;B.化学合成;C.电子显微镜;D.催化性能;

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