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首页> 外文期刊>Journal of Hazardous Materials >H_2O_2-sensitized TiO_2/SiO_2 composites with high photocatalytic activity under visible irradiation
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H_2O_2-sensitized TiO_2/SiO_2 composites with high photocatalytic activity under visible irradiation

机译：可见光下具有高光催化活性的H_2O_2敏化的TiO_2 / SiO_2复合材料

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摘要

TiO_2/SiO_2 composite photocatalysts were prepared by depositing of TiO_2 onto nano-SiO_2 particles. X-ray diffraction (XRD), transmission electron micrograph (TEM), Raman spectrometer, UV-Vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy (FT-IR) were employed to characterize the properties of the synthesized TiO_2/SiO_2 composites. These results indicated that the products without calcination were amorphous, and calcination could enhance the crystallinity of TiO_2. Increases in the amount of TiO_2 would decrease the dispersion in the composites. H_2O_2-sensitized TiO_2/SiO_2 composite photocatalysts could absorb visible light at wavelength below 550 nm. The photocatalytic activity of as-prepared catalysts was characterized by methyl-orange degradation. The results showed the uncalcined composite photocatalysts with amorphous TiO_2 exhibited higher photocatalytic activity under visible light, and the activity of catalysts with TiO_2 content over 30% decreased with increasing of TiO_2 content. Increases in the calcination temperature and TiO_2 content promote the formation of bulk TiO_2 and result in a decrease in activity.
机译：通过将TiO_2沉积在纳米SiO_2颗粒上制备TiO_2 / SiO_2复合光催化剂。利用X射线衍射（XRD），透射电子显微照片（TEM），拉曼光谱仪，紫外-可见漫反射光谱，傅立叶变换红外光谱（FT-IR）表征了合成的TiO_2 / SiO_2复合材料的性能。这些结果表明，未经煅烧的产物是无定形的，煅烧可以提高TiO_2的结晶度。 TiO_2含量的增加会降低复合材料的分散性。 H_2O_2敏化的TiO_2 / SiO_2复合光催化剂可以吸收550 nm以下的可见光。所制备的催化剂的光催化活性以甲基-橙色降解为特征。结果表明，在可见光下，未煅烧的无定形TiO_2复合光催化剂具有较高的光催化活性，TiO_2含量在30％以上的催化剂的活性随TiO_2含量的增加而降低。煅烧温度的升高和TiO_2含量的增加促进了整体TiO_2的形成并导致活性降低。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2011年第3期|p.710-716|共7页
  • 作者

    Jian Zou; Jiacheng Gao;

  • 作者单位

    School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715. PR China, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;

    College of Materials Science and 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TiO_2/SiO_2; Visible light; Sensitizing; H_2O_2;

    机译：TiO_2 / SiO_2;可见光;敏化;H_2O_2;

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