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首页> 外文期刊>Applied Surface Science >Photocatalytic decomposition of N2O over TiO2/g-C3N4 photocatalysts heterojunction
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Photocatalytic decomposition of N2O over TiO2/g-C3N4 photocatalysts heterojunction

机译：TiO2 / g-C3N4光催化剂异质结上N2O的光催化分解

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摘要

TiO2/g-C3N4 photocatalysts with the various TiO2/g-C3N4 weight ratios from 1:2 to 1:6 were fabricated by mechanical mixing in water suspension followed by calcination. Pure TiO2 was prepared by thermal hydrolysis and pure g-C3N4 was prepared from commercial melamine by thermal annealing at 620 degrees C. All the nanocomposites were characterized by X-ray powder diffraction, UV-vis diffuse reflectance spectroscopy, Raman spectroscopy, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, photoelectro chemical measurements and nitrogen physisorption. The prepared mixtures along with pure TiO2 and g-C3N4 were tested for the photocatalytic decomposition of nitrous oxide under UVC (lambda = 254 nm), UVA (lambda=365 nm) and Vis (lambda > 400 nm) irradiation. The TiO2/gC(3)N(4) nanocomposites showed moderate improvement compared to pure g-C3N4 but pure TiO2 proved to be a better photocatalyst under UVC irradiation. However, under UVA irradiation conditions, the photocatalytic activity of TiO2/g-C3N4 (1:2) nanocomposite exhibited an increase compared to pure TiO2. Nevertheless, further increase of g-C3N4 amount leads/led to a decrease in reactivity. These results are suggesting the nanocomposite with the optimal weight ratio of TiO2 and g-C3N4 have shifted absorption edge energy towards longer wavelengths and decreased the recombination rate of charge carriers compared to pure g-C3N4. This is probably due to the generation of heterojunction on the TiO2/g-C3N4 interface. (C) 2016 Elsevier B.V. All rights reserved.
机译：TiO2 / g-C3N4重量比为1：2至1：6的TiO2 / g-C3N4光催化剂是通过在水悬浮液中机械混合然后煅烧制备的。通过热水解制备纯TiO2，并通过商业三聚氰胺在620摄氏度下进行热退火制备纯g-C3N4。所有纳米复合材料均通过X射线粉末衍射，紫外可见漫反射光谱，拉曼光谱，红外光谱，扫描电子显微镜，透射电子显微镜，光电化学测量和氮物理吸附。测试了制备的混合物以及纯TiO2和g-C3N4在UVC（λ= 254 nm），UVA（λ= 365 nm）和Vis（λ> 400 nm）照射下对一氧化二氮的光催化分解。与纯g-C3N4相比，TiO2 / gC（3）N（4）纳米复合材料显示出适度的改善，但纯TiO2被证明是在UVC照射下更好的光催化剂。但是，在UVA照射条件下，与纯TiO2相比，TiO2 / g-C3N4（1：2）纳米复合材料的光催化活性有所提高。然而，g-C 3 N 4量的进一步增加导致/导致反应性降低。这些结果表明，与纯g-C3N4相比，具有最佳重量比的TiO2和g-C3N4的纳米复合材料已将吸收边缘能移向更长的波长，并降低了电荷载流子的复合率。这可能是由于在TiO2 / g-C3N4界面上产生了异质结。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第2期|1685-1695|共11页
  • 作者

    Koci K.; Reli M.; Troppova I.; Sihor M.; Kupkova J.; Kustrowski P.; Praus P.;

  • 作者单位

    VSB Tech Univ Ostrava, Inst Environm Technol, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

    VSB Tech Univ Ostrava, Inst Environm Technol, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

    VSB Tech Univ Ostrava, Inst Environm Technol, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

    VSB Tech Univ Ostrava, Inst Environm Technol, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

    VSB Tech Univ Ostrava, Nanotechnol Ctr, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

    Jagiellonian Univ, Fac Chem, Ul Ingardena 3, PL-30060 Krakow, Poland;

    VSB Tech Univ Ostrava, Inst Environm Technol, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic|VSB Tech Univ Ostrava, Dept Chem, 17 Listopadu 15-2172, Ostrava 70800, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    Graphitic carbon nitride; Titania; Photocatalysis; Greenhouse gases;

    机译：石墨氮化碳;二氧化钛;光催化;温室气体;

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