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首页> 外文期刊>RSC Advances >Enhanced visible light absorption and photocatalytic activity of [KNbO3](1-x)[BaNi0.5Nb0.5O3-delta](x) synthesized by sol-gel based Pechini method
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Enhanced visible light absorption and photocatalytic activity of [KNbO3](1-x)[BaNi0.5Nb0.5O3-delta](x) synthesized by sol-gel based Pechini method

机译：由基于溶胶 - 凝胶的Pechini方法合成的[KNO3]（1-X）[BANI0.5NB0.5O3-DERTA]（X）的增强的可见光吸收和光催化活性

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摘要

Ba, Ni co-modified KNbO3 nanocrystals (KBNNO) were synthesized by sol-gel based Pechini method. X-ray diffraction and Raman measurements reveals the phase transformation of KBNNO from orthorhombic to cubic phase with increasing doping ratio x. Particle sizes of KBNNO nanocrystals were measured to range from 50 nm to 200 nm by scanning electron microscopy. X-ray photoelectron spectroscopy and electron dispersive X-ray elemental analysis reveal the elemental composition of KBNNO samples. Ultraviolet-visible-near infrared optical absorption spectra of KBNNO show enhanced visible light absorption compared with pure KNbO3 synthesized under the same conditions. Photocatalytic activity evaluation displays an enhanced visible light photocatalytic activity of KBNNO in degrading methylene blue in comparison with KNbO3 and P25 TiO2. Notably, KBNNO with x = 0.2 displays the greatest photoreactivity compared with KNbO3 and P25 TiO2. The mechanism responsible for the enhancement of visible light absorption by Ni2+ in KBNNO was discussed, highlighting the crucial role that Ni2+ ions have played in the sub-energy levels of KBNNO.
机译：通过基于溶胶 - 凝胶的Pechini方法合成了Ba，Ni共改性的KNO3纳米晶（KBNNO）。 X射线衍射和拉曼测量揭示了随着掺杂比X增加到立方相的kBnnO的相变。通过扫描电子显微镜测量KbnNO纳米晶体的粒径为50nm至200nm。 X射线光电子体光谱和电子分散X射线元素分析显示KBNNO样品的元素组成。 KBNNO的紫外 - 可见近红外光学吸收光谱显示，与在相同条件下合成的纯度织合相比，kBnno的近似光吸收光谱显示出增强的可见光吸收。光催化活性评估显示与KNO3和P25 TiO2相比，在降解亚甲基蓝中显示出KBNNO的增强的可见光光催化活性。值得注意的是，X = 0.2的KBNNO显示器与KNO3和P25 TiO2相比显示最大的光反应性。讨论了负责增强Ni2 +在KBNNO中的可见光吸收的机制，突出了Ni2 +离子在KBNNO的次能水平中发挥的至关重要作用。

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  • 来源
    《RSC Advances》 |2016年第85期|共8页
  • 作者

    Wu Ping; Wang Guoming; Chen Ruizhi; Guo Yixin; Ma Xueming; Jiang Dongmei;

  • 作者单位

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

    East China Normal Univ Sch Phys &

    Mat Sci Shanghai 200241 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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