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Constructing novel Ag nanoparticles anchored on MnO2 nanowires as an efficient visible light driven photocatalyst

机译：构建锚固在MnO2纳米线上的新型Ag纳米颗粒作为有效的可见光驱动光催化剂

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In this study, novel Ag@MnO2 nanowires were constructed, using a one step hydrothermal method, which exhibited excellent efficiency towards the photodegradation of organic contaminants under visible-light driven irradiation. The resulting Ag@MnO2 nanowires were systematically characterized using various spectroscopic and microscopic techniques. Morphological characterizations show that the Ag nanoparticles are well anchored on the surface of the MnO2 nanowires. The N-2 adsorption/desorption studies revealed that the as prepared photocatalyst possesses mesoporosity. The optical properties and energy band gap structures were studied using UV-visible diffuse reflectance spectroscopy. The photocatalytic activity enhancement of the Ag@MnO2 (5%) nanowires could be ascribed to the efficient separation of the photogenerated electron-hole pairs compared to other Ag@MnO2 nanowires and pure MnO2. The possible photocatalytic mechanism was proposed for this enhanced charge separation performance using photoluminescence spectra analysis, electrochemical impedance spectroscopy (EIS) spectra and photocurrent density. Furthermore, photocatalytic mechanism investigations demonstrate that (OH)-O-center dot and O-2(center dot-) play a key role and h(+) plays a minor role in the photocatalytic process. We believe that our findings can open a new avenue for the photocatalytic applications of Ag@MnO2 nanowires.
机译：在这项研究中，使用一步水热法构建了新型的Ag @ MnO2纳米线，该线在可见光驱动的辐射下对有机污染物的光降解表现出优异的效率。使用各种光谱和显微镜技术对所得的Ag @ MnO2纳米线进行了系统表征。形态学表征表明，Ag纳米颗粒良好地锚固在MnO 2纳米线的表面上。 N-2吸附/解吸研究表明所制备的光催化剂具有介孔性。使用紫外可见漫反射光谱法研究了光学性质和能带隙结构。与其他Ag @ MnO2纳米线和纯MnO2相比，Ag @ MnO2（5％）纳米线的光催化活性增强可以归因于光生电子-空穴对的有效分离。提出了利用光致发光光谱分析，电化学阻抗谱（EIS）光谱和光电流密度来增强电荷分离性能的可能的光催化机理。此外，光催化机理的研究表明（OH）-O-中心点和O-2（中心点-）发挥关键作用，而h（+）在光催化过程中起次要作用。我们相信，我们的发现可以为Ag @ MnO2纳米线的光催化应用开辟新的途径。

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