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首页> 外文期刊>RSC Advances >One-pot synthesis of Ag-modified LaMnO3-graphene hybrid photocatalysts and application in the photocatalytic discoloration of an azo-dye
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One-pot synthesis of Ag-modified LaMnO3-graphene hybrid photocatalysts and application in the photocatalytic discoloration of an azo-dye

机译：A合型兰诺3-石墨烯杂交光催化剂的单壶合成，在偶氮染料光催化变色中的应用

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摘要

Ag-modified LaMnO3-graphene nanocomposites were successfully synthesized by the sol-gel technique. The nanocomposites were characterized by X-ray diffraction, field-emission scanning electron microscopy with energy dispersive spectrometer, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area analysis and photoluminescence analysis. High-efficiency degradation of Direct Green BE under UV-vis light was achieved for Ag/LaMnO3-graphene as photocatalyst. The enhancement of UV-vis photocatalytic activity can be attributed to the high separation efficiency of photoinduced electron-hole pairs resulting from the excellent conductivity of Ag in composites and the formation of multistage drill way, which can promote the adsorption of organic dyes and improve the transfer efficiency of the photocatalytic process. The photocatalytic mechanism was studied by adding hydroxyl radical ((OH)-O-center dot), superoxide radical (O-center dot(2-)), and active hole (h(+)) scavengers. The results confirmed that h(+) generated in Ag/LaMnO3-graphene played a key role in photocatalysis, with the assistance of (OH)-O-center dot. By contrast, O-center dot(2-) had the least influence on the process.
机译：通过溶胶 - 凝胶技术成功地合成了Ag改性的兰诺3-石墨烯纳米复合材料。纳米复合材料的特征在于X射线衍射，现场排放扫描电子显微镜，具有能量分散光谱仪，透射电子显微镜，X射线光电子能谱，Brunauer-Emmett-extreser面积分析和光致发光分析。为光催化剂，实现了直接绿色的高效降解在紫外线下，实现了Ag / Lamno3-石墨烯。 UV-Vis光催化活性的增强可归因于光致电电子 - 空穴对的高分离效率，由复合材料中的Ag的优异导电性和多级钻头的形成，这可以促进有机染料的吸附并改善光催化过程的转移效率。通过加入羟基（（OH）-O中心点），超氧化物自由基（O中心点（2-））和活性孔（H（+））清除剂来研究光催化机理。结果证实，在Ag / Lamno3-石墨烯中产生的H（+）在光催化中发挥了关键作用，在（OH）-O中心点的辅助。相比之下，O-Center Dot（2-）对该过程的影响最小。

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  • 来源
    《RSC Advances》 |2015年第67期|共9页
  • 作者

    Hu Jie; Men Jie; Liu Yuanyuan; Huang Hao; Jiao Tifeng;

  • 作者单位

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Hebei Key Lab Appl Chem Dept Environm &

    Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ Hebei Key Lab Appl Chem Dept Environm &

    Chem Qinhuangdao 066004 Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao 066004 Peoples R China;

    Yanshan Univ State Key Lab Metastable Mat Sci &

    Technol Qinhuangdao 066004 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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