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首页> 外文期刊>Materials Science and Engineering >Synthesis of AgBr/Ag_4P_2O_7 composite photocatalyst and enhanced photocatalytic performance
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Synthesis of AgBr/Ag_4P_2O_7 composite photocatalyst and enhanced photocatalytic performance

机译：AgBr / Ag_4P_2O_7复合光催化剂的合成及增强的光催化性能

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摘要

Ag_4P_2O_7 and AgBr/Ag_4P_2O_7 photocatalysts were synthesized by a simple precipitation reaction, and their structures were characterized by X-ray powder diffraction, scanning electronic microscopy, Brunauer-Emmett-Teller surface area analysis, X-ray photoemission spectroscopy, UV-vis absorption spectroscopy, photoluminescence, and surface photovoltage techniques. Photocatalytic degradations of methylene blue over Ag_4P_2O_7 and AgBr/Ag_4P_2O_7 were also studied under visible light irradiation. AgBr/Ag_4P_2O_7 exhibited excellent photocatalytic efficiency, with the activity higher than that of Ag_4P_2O_7. The band gap and valence band of Ag_4P_2O_7 were 2.67 eV and 1.93 eV, respectively. Ag_4P_2O_7 failed to produce ~•OH radicals by directly oxidizing OH~- because the oxidation potential of OH~- was 2.7 eV. Therefore, electrons excited by light reacted with O_2 to produce ~•O_2~- radicals that then formed ~•OH radicals. Finally, ~•OH radicals oxidized MB molecules. The matching energy bands of Ag_4P_2O_7 and AgBr in the AgBr/Ag_4P_2O_)7 heterocatalysts effectively separated the photo-induced charges, which may enhance the photocatalytic activity of Ag_4P_2O_7.
机译：通过简单的沉淀反应合成Ag_4P_2O_7和AgBr / Ag_4P_2O_7光催化剂，并通过X射线粉末衍射，扫描电子显微镜，Brunauer-Emmett-Teller表面积分析，X射线光发射光谱，紫外可见吸收光谱对它们的结构进行了表征。 ，光致发光和表面光电压技术。在可见光照射下，还研究了在Ag_4P_2O_7和AgBr / Ag_4P_2O_7上对亚甲基蓝的光催化降解。 AgBr / Ag_4P_2O_7表现出优异的光催化效率，其活性高于Ag_4P_2O_7。 Ag_4P_2O_7的带隙和价带分别为2.67 eV和1.93 eV。 Ag_4P_2O_7无法通过直接氧化OH〜-产生〜•OH自由基，因为OH〜-的氧化电位为2.7 eV。因此，被光激发的电子与O_2反应生成〜•O_2〜-自由基，然后形成〜•OH自由基。最后，〜•OH自由基氧化了MB分子。 AgBr / Ag_4P_2O_）7杂催化剂中Ag_4P_2O_7和AgBr的匹配能带有效地分离了光诱导的电荷，这可以增强Ag_4P_2O_7的光催化活性。

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  • 来源
    《Materials Science and Engineering》 |2014年第11期|70-75|共6页
  • 作者

    Limin Song; Yamiao Li; Haifeng Tian; Xiaoqing Wu; Sheng Fang; Shujuan Zhang;

  • 作者单位

    College of Environment and Chemical Engineering & State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387, People's Republic of China;

    College of Environment and Chemical Engineering & State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387, People's Republic of China;

    College of Environment and Chemical Engineering & State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387, People's Republic of China;

    Institute of Composite Materials, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387, People's Republic of China;

    College of Environment and Chemical Engineering & State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387, People's Republic of China;

    College of Science, Tianjin University of Science & Technology, No. 29 Shisan Street Kaifa District, Tianjin 300457, People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    AgBr/Ag_4P_2O_7, Photocatalysis; Methylene blue;

    机译：AgBr / Ag_4P_2O_7;光催化;亚甲蓝;

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