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首页> 外文期刊>Applied Surface Science >Opposite effect of photocorrosion on photocatalytic performance among various AgxMyOz/TiO2 (M = C, P) photocatalysts: A novel effective method for preparing Ag/TiO2 composite
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Opposite effect of photocorrosion on photocatalytic performance among various AgxMyOz/TiO2 (M = C, P) photocatalysts: A novel effective method for preparing Ag/TiO2 composite

机译：光腐蚀对各种AgxMyOz / TiO2（M = C，P）光催化剂的光催化性能的相反影响：一种制备Ag / TiO2复合材料的有效方法

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摘要

Three kinds of hybrids, Ag2CO3/TiO2, Ag2C2O4/TiO2 and Ag3PO4/TiO2 comprising of P25-TiO2 and silver containing photocatalyst, (together coded as AgxMyOz/TiO2 (M = C, P)) were prepared via a facile precipitation method. The photocatalytic activity and stability of the as-prepared AgxMyOz/TiO2 was compared by monitoring the oxidation of propylene under visible light irradiation. Results showed that both Ag2CO3/TiO2 and Ag2C2O4/TiO2 exhibit perfect performance with a high propylene degradation removal rate of 88% and 78%, respectively, during four successive experimental runs. On the contrary, for Ag3PO4/TiO2, the photocatalytic activity gradually declines to 8% from 32% under the same conditions. In order to explore the reason for the above remarkable difference in activity and stability over AgxMyOz/TiO2, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and UV-vis diffuse reflectance spectroscopy (DRS) were used to investigate the change of AgxMyOz/TiO2 before and after irradiation. It was found that three silver-containings, Ag2CO3, Ag2C2O4 and Ag3PO4 on the surface of TiO2, all experienced photo-corrosion to various extents during irradiation process. Surprisingly, the effect of photo-corrosion on visible light activity and stability among various AgxMyOz/TiO2 is very different. For both Ag2CO3 and Ag2C2O4, they are easily decomposed into metallic Ag and CO2, and gaseous CO2 escaped from catalyst leaving silver nanoparticles on the surface of TiO2 resulted in the formation of plasmonic photocatalyst Ag/TiO2. The synergetic effect between surface plasma resonance of silver and interfacial electron transfer over the obtained Ag/TiO2 heterojunctions is in favor of the superior photocatalytic performance under visible light. While for Ag3PO4/TiO2, Ag3PO4 on the surface of TiO2 is partially photo-decomposed into Ag and phosphorus oxide and the phosphorus oxide covering on the surface of undecomposed Ag3PO4/TiO2 deactivates its photocatalytic performance. By comparison with the traditional Ag/TiO2 synthesized by photochemical reduction method, it was found that the photo corrosion of Ag2CO3/TiO2 or Ag2C2O4/TiO2 can be used as a more effective method for preparing Ag/TiO2 composite. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过一种简便的沉淀法制备了由P25-TiO2和含银光催化剂组成的Ag2CO3 / TiO2，Ag2C2O4 / TiO2和Ag3PO4 / TiO2三种杂化物（统称为AgxMyOz / TiO2（M = C，P））。通过监测可见光照射下丙烯的氧化，比较了所制备的AgxMyOz / TiO2的光催化活性和稳定性。结果表明，在连续四个实验运行中，Ag2CO3 / TiO2和Ag2C2O4 / TiO2均表现出理想的性能，丙烯降解去除率分别高达88％和78％。相反，对于Ag3PO4 / TiO2，在相同条件下，光催化活性从32％逐渐下降至8％。为了探索上述活性和稳定性与AgxMyOz / TiO2相比存在显着差异的原因，我们使用X射线光电子能谱（XPS），X射线衍射（XRD）和紫外可见漫反射光谱（DRS）进行了研究。照射前后AgxMyOz / TiO2的变化。发现在TiO2表面上的三种含银Ag2CO3，Ag2C2O4和Ag3PO4在辐照过程中均经历了不同程度的光腐蚀。令人惊讶的是，光腐蚀对各种AgxMyOz / TiO2之间可见光活性和稳定性的影响是非常不同的。对于Ag2CO3和Ag2C2O4，它们都容易分解为金属Ag和CO2，并且气态CO2从催化剂中逸出，从而使银纳米颗粒留在TiO2的表面上，导致形成等离激元光催化剂Ag / TiO2。银的表面等离子体共振与在所获得的Ag / TiO 2异质结上的界面电子转移之间的协同效应有利于在可见光下的优异光催化性能。而对于Ag 3 PO 4 / TiO 2，TiO 2表面上的Ag 3 PO 4被部分光分解为Ag和氧化磷，并且未分解的Ag 3 PO 4 / TiO 2表面上覆盖的氧化磷使其光催化性能失活。通过与光化学还原法合成的传统Ag / TiO2的比较，发现Ag2CO3 / TiO2或Ag2C2O4 / TiO2的光腐蚀可作为制备Ag / TiO2复合材料的更有效方法。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2016年第15期|188-198|共11页
  • 作者

    Feng Caixia; Pang Yuhua; Wang Yan; Sun Mingming; Zhang Chenyan; Zhang Ling; Zhou Yanmei; Li Deliang;

  • 作者单位

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China|Henan Univ, Dept Sci Res, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

    Henan Univ, Coll Chem & Chem Engn, Inst Environm & Analyt Sci, Kaifeng 475004, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Silver-containing photocatalysts; Photo-corrosion; Surface plasma resonance; Electron transfer; Visible light catalytic activity;

    机译：含银光催化剂;光腐蚀;表面等离子体共振;电子转移;可见光催化活性;

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